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Articles 1081 - 1110 of 1948

Full-Text Articles in Entire DC Network

Search For R-Parity Violating Decays Of A Top Squark In Proton–Proton Collisions At S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For R-Parity Violating Decays Of A Top Squark In Proton–Proton Collisions At S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The results of a search for a supersymmetric partner of the top quark (top squark), pair-produced in proton–proton collisions at s=8 TeV, are presented. The search, which focuses on R-parity violating, chargino-mediated decays of the top squark, is performed in final states with low missing transverse momentum, two oppositely charged electrons or muons, and at least five jets. The analysis uses a data sample corresponding to an integrated luminosity of 19.7 fb−1 collected with the CMS detector at the LHC in 2012. The data are found to be in agreement with the standard model expectation, and upper limits are placed …

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Measurement Of The W Boson Helicity Fractions In The Decays Of Top Quark Pairs To Lepton + Jets Final States Produced In Pp Collisions At S=8tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Measurement Of The W Boson Helicity Fractions In The Decays Of Top Quark Pairs To Lepton + Jets Final States Produced In Pp Collisions At S=8tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The W boson helicity fractions from top quark decays in tt‾ events are measured using data from proton–proton collisions at a centre-of-mass energy of 8TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8fb−1. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F0=0.681±0.012(stat)±0.023(syst), FL=0.323±0.008(stat)±0.014(syst), and FR=−0.004±0.005(stat)±0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. …

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Study Of Z Boson Production In Ppb Collisions At √Snn=5.02 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Study Of Z Boson Production In Ppb Collisions At √Snn=5.02 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The production of Z bosons in pPb collisions at sNN=5.02 TeV is studied by the CMS experiment via the electron and muon decay channels. The inclusive cross section is compared to pp collision predictions, and found to scale with the number of elementary nucleon-nucleon collisions. The differential cross sections as a function of the Z boson rapidity and transverse momentum are measured. Though they are found to be consistent within uncertainty with theoretical predictions both with and without nuclear effects, the forward-backward asymmetry suggests the presence of nuclear effects at large rapidities. These results provide new data for constraining nuclear …

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Search For Neutral Resonances Decaying Into A Z Boson And A Pair Of B Jets Or Τ Leptons, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For Neutral Resonances Decaying Into A Z Boson And A Pair Of B Jets Or Τ Leptons, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A search is performed for a new resonance decaying into a lighter resonance and a Z boson. Two channels are studied, targeting the decay of the lighter resonance into either a pair of oppositely charged τ leptons or a bb pair. The Z boson is identified via its decays to electrons or muons. The search exploits data collected by the CMS experiment at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.8 fb-1. No significant deviations are observed from the standard model expectation and limits are set on production cross sections and parameters of two-Higgs-doublet models.

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Search For A Low-Mass Pseudoscalar Higgs Boson Produced In Association With A Bb̅ Pair In Pp Collisions At √S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For A Low-Mass Pseudoscalar Higgs Boson Produced In Association With A Bb̅ Pair In Pp Collisions At √S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A search is reported for a light pseudoscalar Higgs boson decaying to a pair of τ leptons, produced in association with a bb pair, in the context of two-Higgs-doublet models. The results are based on pp collision data at a centre-of-mass energy of 8 TeV collected by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 fb-1. Pseudoscalar boson masses between 25 and 80 GeV are probed. No evidence for a pseudoscalar boson is found and upper limits are set on the product of cross section and branching fraction to τ pairs between 7 and …

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Inclusive And Differential Measurements Of The Tt Charge Asymmetry In Pp Collisions At √S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Inclusive And Differential Measurements Of The Tt Charge Asymmetry In Pp Collisions At √S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The tt- charge asymmetry is measured in proton-proton collisions at a centre-of-mass energy of 8 TeV. The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb-1. Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010±0.0068 (stat)±0.0037 (syst). In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt- system are studied. For the first time at the LHC, the measurements …

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Search For Supersymmetry In Events With A Photon, A Lepton, And Missing Transverse Momentum In Pp Collisions At √S=8tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For Supersymmetry In Events With A Photon, A Lepton, And Missing Transverse Momentum In Pp Collisions At √S=8tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A search for supersymmetry involving events with at least one photon, one electron or muon, and large missing transverse momentum has been performed by the CMS experiment. The data sample corresponds to an integrated luminosity of 19.7 fb-1 of pp collisions at s=8 TeV, produced at the CERN LHC. No excess of events is observed beyond expectations from standard model processes. The result of the search is interpreted in the context of a general model of gauge-mediated supersymmetry breaking, where the charged and neutral winos are the next-to-lightest supersymmetric particles. Within this model, winos with a mass up to 360 …

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Search For W' Decaying To Tau Lepton And Neutrino In Proton-Proton Collisions At S=8 Tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For W' Decaying To Tau Lepton And Neutrino In Proton-Proton Collisions At S=8 Tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The first search for a heavy charged vector boson in the final state with a tau lepton and a neutrino is reported, using 19.7 fb-1 of LHC data at s=8 TeV. A signal would appear as an excess of events with high transverse mass, where the standard model background is low. No excess is observed. Limits are set on a model in which the W' decays preferentially to fermions of the third generation. These results substantially extend previous constraints on this model. Masses below 2.0 to 2.7 TeV are excluded, depending on the model parameters. In addition, the existence of …

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Search For New Phenomena In Monophoton Final States In Proton-Proton Collisions At √S=Tev, M M. Baarmand, Marcus Hohlmann, H Kalakhety, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For New Phenomena In Monophoton Final States In Proton-Proton Collisions At √S=Tev, M M. Baarmand, Marcus Hohlmann, H Kalakhety, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

Results are presented from a search for new physics in final states containing a photon and missing transverse momentum. The data correspond to an integrated luminosity of 19.6 fb-1 collected in proton-proton collisions at √s=TeV with the CMS experiment at the LHC. No deviation from the standard model predictions is observed for these final states. New, improved limits are set on dark matter production and on parameters of models with large extra dimensions. In particular, the first limits from the LHC on branon production are found and significantly extend previous limits from LEP and the Tevatron. An upper limit of …

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Measurement Of The Cp-Violating Weak Phase Φs And The Decay Width Difference Δγs Using The B0s→J/Ψφ(1020)Decay Channel In Pp Collisions At √S=8tev, M M. Baarnand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Measurement Of The Cp-Violating Weak Phase Φs And The Decay Width Difference Δγs Using The B0s→J/Ψφ(1020)Decay Channel In Pp Collisions At √S=8tev, M M. Baarnand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The CP-violating weak phase φsof the B0smeson and the decay width difference δΓs of the B0slight and heavy mass eigenstates are measured with the CMS detector at the LHC using a data sample of B0s→J/ψφ(1020)→μ+μ−K+K−decays. The analysed data set corresponds to an integrated luminosity of 19.7 fb−1collected in pp collisions at a centre-of-mass energy of 8 TeV. A total of 49200 reconstructed B0s decays are used to extract the values of φs and δΓs by performing a time-dependent and flavour-tagged angular analysis of the μ+μ−K+K−final state. The weak phase is mea-sured to be φs=−0.075 ±0.097 (stat) ±0.031 (syst)rad, and the …

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Searches For A Heavy Scalar Boson H Decaying To A Pair Of 125 Gev Higgs Bosons Hh Or For A Heavy Pseudoscalar Boson A Decaying To Zh, In The Final States With H→Ττ, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Searches For A Heavy Scalar Boson H Decaying To A Pair Of 125 Gev Higgs Bosons Hh Or For A Heavy Pseudoscalar Boson A Decaying To Zh, In The Final States With H→Ττ, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A search for a heavy scalar boson H decaying into a pair of lighter standard-model-like 125 GeV Higgs bosons hh and a search for a heavy pseudoscalar boson A decaying into a Z and an h boson are presented. The searches are performed on a data set corresponding to an integrated luminosity of 19.7 fb-1 of pp collision data at a centre-of-mass energy of 8 TeV, collected by CMS in 2012. A final state consisting of two τ leptons and two b jets is used to search for the H→hh decay. A final state consisting of two τ leptons from …

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Search For A Higgs Boson Decaying Into Γ*Γ→ℓℓγ With Low Dilepton Mass In Pp Collisions At √S=8 Tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For A Higgs Boson Decaying Into Γ*Γ→ℓℓγ With Low Dilepton Mass In Pp Collisions At √S=8 Tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A search is described for a Higgs boson decaying into two photons, one of which has an internal conversion to a muon or an electron pair (ℓℓγ). The analysis is performed using proton-proton collision data recorded with the CMS detector at the LHC at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The events selected have an opposite-sign muon or electron pair and a high transverse momentum photon. No excess above background has been found in the three-body invariant mass range 120

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Angular Analysis Of The Decay B0→K∗0Μ+Μ− From Pp Collisions At √S=8tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Angular Analysis Of The Decay B0→K∗0Μ+Μ− From Pp Collisions At √S=8tev, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The angular distributions and the differential branching fraction of the decay B0→K*(892)0μ+μ- are studied using data corresponding to an integrated luminosity of 20.5 fb-1 collected with the CMS detector at the LHC in pp collisions at s=8 TeV. From 1430 signal decays, the forward-backward asymmetry of the muons, the K*(892)0 longitudinal polarization fraction, and the differential branching fraction are determined as a function of the dimuon invariant mass squared. The measurements are among the most precise to date and are in good agreement with standard model predictions.

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Anisotropic Thermodynamic And Transport Properties Of Single-Crystalline Cakfe4As4, W. R. Meier, T. Kong, U. S. Kaluarachchi, V. Taufour, N. H. Jo, G. Drachuck, A. E. Böhmer, S. M. Saunders, A. Sapkota, A. Kreyssig, M. A. Tanatar, R. Prozorov, A. I. Goldman, Fedor F. Balakirev, Alex Gurevich, S. L. Bud'ko, P. C. Canfield Jan 2016

Anisotropic Thermodynamic And Transport Properties Of Single-Crystalline Cakfe4As4, W. R. Meier, T. Kong, U. S. Kaluarachchi, V. Taufour, N. H. Jo, G. Drachuck, A. E. Böhmer, S. M. Saunders, A. Sapkota, A. Kreyssig, M. A. Tanatar, R. Prozorov, A. I. Goldman, Fedor F. Balakirev, Alex Gurevich, S. L. Bud'ko, P. C. Canfield

Physics Faculty Publications

Single-crystalline, single-phase CaKFe4As4 has been grown out of a high-temperature, quaternary melt. Temperature-dependent measurements of x-ray diffraction, anisotropic electrical resistivity, elastoresistivity, thermoelectric power, Hall effect, magnetization, and specific heat, combined with field-dependent measurements of electrical resistivity and field and pressure-dependent measurements of magnetization indicate that CaKFe4As4 is an ordered, stoichiometric, Fe-based superconductor with a superconducting critical temperature, Tc = 35.0 ± 0.2 K. Other than superconductivity, there is no indication of any other phase transition for 1.8K ≤ T ≤ 300 K. All of these thermodynamic and transport data reveal striking similarities to …

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Production Of Highly Polarized Positrons Using Polarized Electrons At Mev Energier, D. Abbott, P. Adderley, A. Adeyemi, P. Aguilera, M. Ali, H. Areti, M. Baylac, J. Benesch, G. Bosson, B. Cade, A. Camsonne, L. S. Cardman, J. Clark, P. Cole, S. Covert, C. Cuevas, O. Dadoun, D. Dale, H. Dong, J. Dumas, E. Fanchini, T. Forest, E. Forman, A. Freyberger, E. Froidefond, S. Golge, J. Grames, P. Guèye, J. Hansknecht, P. Harrell, J. Hoskins, C. Hyde, B. Josey, R. Kazimi, Y. Kim, D. Machie, K. Mahoney, R. Mammei, M. Marton, J. Mccarter, M. Mccaughan, M. Mchugh, D. Mcnulty, K. E. Mesick, T. Michaelides, R. Michaels, B. Moffit, D. Moser, C. Muñoz-Camacho, J. -F. Muraz, A. Opper, M. Poelker, J. -S. Réal, L. Richardson, S. Setiniyaz, M. Stutzman, R. Suleiman, C. Tennant, C. Tsai, D. Turner, M. Ungaro, A. Variola, E. Voutier, Y. Wang, Y. Zhang Jan 2016

Production Of Highly Polarized Positrons Using Polarized Electrons At Mev Energier, D. Abbott, P. Adderley, A. Adeyemi, P. Aguilera, M. Ali, H. Areti, M. Baylac, J. Benesch, G. Bosson, B. Cade, A. Camsonne, L. S. Cardman, J. Clark, P. Cole, S. Covert, C. Cuevas, O. Dadoun, D. Dale, H. Dong, J. Dumas, E. Fanchini, T. Forest, E. Forman, A. Freyberger, E. Froidefond, S. Golge, J. Grames, P. Guèye, J. Hansknecht, P. Harrell, J. Hoskins, C. Hyde, B. Josey, R. Kazimi, Y. Kim, D. Machie, K. Mahoney, R. Mammei, M. Marton, J. Mccarter, M. Mccaughan, M. Mchugh, D. Mcnulty, K. E. Mesick, T. Michaelides, R. Michaels, B. Moffit, D. Moser, C. Muñoz-Camacho, J. -F. Muraz, A. Opper, M. Poelker, J. -S. Réal, L. Richardson, S. Setiniyaz, M. Stutzman, R. Suleiman, C. Tennant, C. Tsai, D. Turner, M. Ungaro, A. Variola, E. Voutier, Y. Wang, Y. Zhang

Physics Faculty Publications

The Polarized Electrons for Polarized Positrons experiment at the injector of the Continuous Electron Beam Accelerator Facility has demonstrated for the first time the efficient transfer of polarization from electrons to positrons produced by the polarized bremsstrahlung radiation induced by a polarized electron beam in a high-𝑍 target. Positron polarization up to 82% have been measured for an initial electron beam momentum of 8.19  MeV/c, limited only by the electron beam polarization. This technique extends polarized positron capabilities from GeV to MeV electron beams, and opens access to polarized positron beam physics to a wide community.

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The Encyclopedia Of Neutrosophic Researchers - Vol. 1, Florentin Smarandache Jan 2016

The Encyclopedia Of Neutrosophic Researchers - Vol. 1, Florentin Smarandache

Branch Mathematics and Statistics Faculty and Staff Publications

This is the first volume of the Encyclopedia of Neutrosophic Researchers, edited from materials offered by the authors who responded to the editor’s invitation. The authors are listed alphabetically. The introduction contains a short history of neutrosophics, together with links to the main papers and books. Neutrosophic set, neutrosophic logic, neutrosophic probability, neutrosophic statistics, neutrosophic measure, neutrosophic precalculus, neutrosophic calculus and so on are gaining significant attention in solving many real life problems that involve uncertainty, impreciseness, vagueness, incompleteness, inconsistent, and indeterminacy. In the past years the fields of neutrosophics have been extended and applied in various fields, such as: …

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Search For Supersymmetry In The Multijet And Missing Transverse Momentum Final State In Pp Collisions At 13tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For Supersymmetry In The Multijet And Missing Transverse Momentum Final State In Pp Collisions At 13tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

A search for new physics is performed based on all-hadronic events with large missing transverse momentum produced in proton-proton collisions at s=13 TeV. The data sample, corresponding to an integrated luminosity of 2.3 fb-1, was collected with the CMS detector at the CERN LHC in 2015. The data are examined in search regions of jet multiplicity, tagged bottom quark jet multiplicity, missing transverse momentum, and the scalar sum of jet transverse momenta. The observed numbers of events in all search regions are found to be consistent with the expectations from standard model processes. Exclusion limits are presented for simplified supersymmetric …

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Transverse Momentum Spectra Of Inclusive B Jets In Ppb Collisions At √Snn=5.02 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Transverse Momentum Spectra Of Inclusive B Jets In Ppb Collisions At √Snn=5.02 Tev, M M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

We present a measurement of b jet transverse momentum (pT) spectra in proton-lead (pPb) collisions using a dataset corresponding to about 35 nb-1 collected with the CMS detector at the LHC. Jets from b quark fragmentation are found by exploiting the long lifetime of hadrons containing a b quark through tagging methods using distributions of the secondary vertex mass and displacement. Extracted cross sections for b jets are scaled by the effective number of nucleon-nucleon collisions and are compared to a reference obtained from pythia simulations of pp collisions. The pythia-based estimate of the nuclear modification factor is found to …

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Search For Supersymmetry In Electroweak Production With Photons And Large Missing Transverse Energy In Pp Collisions At √S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For Supersymmetry In Electroweak Production With Photons And Large Missing Transverse Energy In Pp Collisions At √S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

Results are reported from a search for supersymmetry with gauge-mediated supersymmetry breaking in electroweak production. Final states with photons and large missing transverse energy (EmissT) were examined. The data sample was collected in pp collisions at √s=8 TeVwith the CMS detector at the LHC and corresponds to 7.4fb−1. The analysis focuses on scenarios in which the lightest neutralino has bino-or wino-like components, resulting in decays to photons and gravitinos, where the gravitinos escape undetected. The data were obtained using a specially designed trigger with dedicated low thresholds, providing good sensitivity to signatures with photons, EmissT, and low hadronic energy. No …

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Measurements Of Tt‾ Charge Asymmetry Using Dilepton Final States In Pp Collisions At S=8tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Measurements Of Tt‾ Charge Asymmetry Using Dilepton Final States In Pp Collisions At S=8tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

The charge asymmetry in tt‾ events is measured using dilepton final states produced in pp collisions at the LHC at s=8TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5fb−1. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The tt‾ and leptonic inclusive charge …

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Search For Supersymmetry In Events With Soft Leptons, Low Jet Multiplicity, And Missing Transverse Energy In Proton-Proton Collisions At S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration Jan 2016

Search For Supersymmetry In Events With Soft Leptons, Low Jet Multiplicity, And Missing Transverse Energy In Proton-Proton Collisions At S=8 Tev, M M. Baarmand, Vallary Bhopatkar, Stefano Colafranceschi, Marcus Hohlmann, H Kalakhety, D Noonan, Tuhin S. Roy, Francisco X. Yumiceva, Cms Collaboration

Aerospace, Physics, and Space Science Faculty Publications

Results are presented from a search for supersymmetric particles in scenarios with small mass splittings. The data sample corresponds to 19.7 fb-1 of proton-proton collisions recorded by the CMS experiment at s=8 TeV. The search targets top squark (t~) pair production in scenarios with mass differences δm=m(t~)-m(χ~10) below the W-boson mass and with top-squark decays in the four-body mode (t~→bℓνχ~10), where the neutralino (χ~10) is assumed to be the lightest supersymmetric particle (LSP). The signature includes a high transverse momentum (pT) jet associated with initial-state radiation, one or two low-pT leptons, and significant missing transverse energy. The event yields observed …

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Effect Of Modeling Instruction On Concept Knowledge Among Ninth Grade Physics Students, Devin Alan Ditmore Jan 2016

Effect Of Modeling Instruction On Concept Knowledge Among Ninth Grade Physics Students, Devin Alan Ditmore

Walden Dissertations and Doctoral Studies

A basic knowledge of physics concepts is the gateway to success through high-paying careers in science, technology, engineering, and mathematics (STEM). Many students show little understanding of concepts following traditional physics instruction. As an alternative to current lecture-based approaches for high school physics instruction, Piaget's theory of cognitive development supports using real scientific experiences to lead learners from concrete to formal understanding of complex concepts. Modeling instruction (MI) is a pedagogy that guides learners through genuine scientific experiences. This project study analyzed the effects of MI on 9th grade physics students' gains on the test measuring mastery of physics concepts, …

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Wavelet Transform Of Optical Conductivity Of Bi2sr2cacu2o8+X In The Normal And Superconducting State, Patrick Janovick Jan 2016

Wavelet Transform Of Optical Conductivity Of Bi2sr2cacu2o8+X In The Normal And Superconducting State, Patrick Janovick

Williams Honors College, Honors Research Projects

This paper compares the wavelet transform of the optical conductivity of Bi2Sr2CaCu2O8+x in both the normal and the superconducting state. The wavelet transforms of the normal and superconducting state are also compared with wavelet transforms of the Drude model as well as the Lorentz model. The wavelet transform of the collected data for Bi2Sr2CaCu2O8+x is similar in shape to the Drude model. The wavelet transform of the collected data in the normal state corresponds to the Drude model with a high scattering rate and the collected …

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Surface Effect Of Ferromagnetic Nanoparticles On Transition Between Single- And Multi-Domain Structure Or Between Single-Domain Structure And Superparamagnetic Phase, Hind Adawi Jan 2016

Surface Effect Of Ferromagnetic Nanoparticles On Transition Between Single- And Multi-Domain Structure Or Between Single-Domain Structure And Superparamagnetic Phase, Hind Adawi

Browse all Theses and Dissertations

Surface effects on critical dimensions of ferromagnetic nanoparticles were studied. Algebraic equations were derived and numerically solved for critical radius RC2 of ferromagnetic nanoparticles describing the transition between single- and multi-domain magnetic structure. Results were analyzed to illustrate the effect of surface parameters related to saturation magnetization a, exchange interaction ß, and anisotropy KS on the critical radius of nanoparticles with a core value of anisotropy KV. Available experimental data for MnBi, FePt, and CoPt or for Fe nanoparticles were used as examples of nanoparticles with high and low values of KV, respectively. Our studies clearly show that discrepancies existing …

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Correlations Between Introductory Students’ Attitudes About Physics And Conceptual Understanding, Raym Alzahrani Jan 2016

Correlations Between Introductory Students’ Attitudes About Physics And Conceptual Understanding, Raym Alzahrani

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The purpose of this study is to measure correlations between the students’ incoming attitudes, beliefs and expectations about physics and their conceptual understanding. The study presents a profile of the attitudes and beliefs for Wright State University students who enrolled in calculus-based General Physics I courses during academic years 2014-2015 and 2015-2016. Students’ initial and final attitudes, measured using the CLASS, are correlated with initial and final conceptual gain, measured using the Force Concept Inventory. Students’ initial attitudes (Opre) was correlated with students’ gain (FCIgain) in many sections. Correlations between students’ final attitudes (Opost) and their conceptual understanding (FCIpost), reported …

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Heavy Quark Production At An Electron-Ion Collider, E. Chudakov, D. Higinbotham, C. Hyde, S. Furletov, Yu Furletova, D. Nguyen, M. Stratmann, M. Strickman, C. Weiss Jan 2016

Heavy Quark Production At An Electron-Ion Collider, E. Chudakov, D. Higinbotham, C. Hyde, S. Furletov, Yu Furletova, D. Nguyen, M. Stratmann, M. Strickman, C. Weiss

Physics Faculty Publications

An Electron-Ion Collider (EIC) with center-of-mass energies √seN ∼ 20-100 GeV and luminosity L ∼ 10³⁴ cm-² s-¹ would offer new opportunities to study heavy quark production in high-energy electron or photon scattering on protons and nuclei. We report about an R&D project exploring the feasibility of direct measurements of nuclear gluon densities at x >∼ 0.1 (gluonic EMC effect, antishadowing) using open charm production at EIC. We describe the charm production rates and angle-momentum distributions at large x and discuss methods of charm reconstruction using next-generation detector capabilities (π/K identification, vertex reconstruction). The results could be …

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A Comparative Analysis Of Photon And Electron Wave Functions In Spherically Symmetric Potentials, Michael Bush Jan 2016

A Comparative Analysis Of Photon And Electron Wave Functions In Spherically Symmetric Potentials, Michael Bush

Senior Independent Study Theses

No abstract provided.

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The Production And Manipulation Of Nonseparable Spin-Orbit Modes Of Light Under Hong-Ou-Mandel Interference Conditions, Maggie E. Lankford Jan 2016

The Production And Manipulation Of Nonseparable Spin-Orbit Modes Of Light Under Hong-Ou-Mandel Interference Conditions, Maggie E. Lankford

Senior Independent Study Theses

No abstract provided.

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Compositional Changes For Reduction Of Polymerisation-Induced Shrinkage In Holo, Dervil Cody, Mohesh Moothanchery, Emilia Mihaylova, Vincent Toal, Svetlana Mintova, Izabela Naydenova Jan 2016

Compositional Changes For Reduction Of Polymerisation-Induced Shrinkage In Holo, Dervil Cody, Mohesh Moothanchery, Emilia Mihaylova, Vincent Toal, Svetlana Mintova, Izabela Naydenova

Doctoral

Polymerisation-induced shrinkage is one of the main reasons why many photopolymer materials are not used for certain applications including holographic optical elements and holographic data storage. Here, two compositional changes for the reduction of shrinkage in an acrylamide-based photopolymer are reported. A holographic interferometric technique was used to study changes in the dynamics of the shrinkage processes occurring in the modified photopolymer during holographic recording in real time. Firstly, the effect of the replacement of the acrylamide monomer in the photopolymer composition with a larger monomer molecule, diacetone acrylamide, on polymerisation-induced shrinkage has been studied. A reduction in relative shrinkage …

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Probing Nuclear Gluons With Heavy Flavors At An Electron-Ion Collider, E. Chudakov, D. Higinbotham, C. Hyde, S. Furletov, Y. Furletova, D. Nguyen, M. Stratmann, M. Strikman, C. Weiss, R. Yoshida Jan 2016

Probing Nuclear Gluons With Heavy Flavors At An Electron-Ion Collider, E. Chudakov, D. Higinbotham, C. Hyde, S. Furletov, Y. Furletova, D. Nguyen, M. Stratmann, M. Strikman, C. Weiss, R. Yoshida

Physics Faculty Publications

We explore the feasibility of direct measurements of nuclear gluon densities using heavy-quark production (open charm, beauty) at a future Electron-Ion Collider (EIC). We focus on the regions x> 0.3 (EMC effect) and x ~ 0.05-0.1 (antishadowing), where the nuclear modifications of the gluon density offer insight into non-nucleonic degrees of freedom and the QCD structure of nucleon-nucleon interactions. We describe the charm production rates and momentum distributions in nuclear deep-inelastic scattering (DIS) at Large XB, and comment on the possible methods for charm reconstruction using next-generation detectors at the EIC (π/K identification, tracking, vertex detection).

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