Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 10 of 10
Full-Text Articles in Physics
Searches For Supersymmetry Using The M T2 Variable In Hadronic Events Produced In Pp Collisions At 8 Tev, Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco X. Yumiceva
Searches For Supersymmetry Using The M T2 Variable In Hadronic Events Produced In Pp Collisions At 8 Tev, Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco X. Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
Searches for supersymmetry (SUSY) are performed using a sample of hadronic events produced in 8 TeV pp collisions at the CERN LHC. The searches are based on the M T2 variable, which is a measure of the transverse momentum imbalance in an event. The data were collected with the CMS detector and correspond to an integrated luminosity of 19.5 fb−1. Two related searches are performed. The first is an inclusive search based on signal regions defined by the value of the M T2 variable, the hadronic energy in the event, the jet multiplicity, and the number of jets …
Search For Vector-Like T Quarks Decaying To Top Quarks And Higgs Bosons In The All-Hadronic Channel Using Jet Substructure, Vardan Khachatryan, Marc M. Baarmand, Marcus Hohlmann, H. Kalakhety, Francisco X. Yumiceva, The Cms Collaboration
Search For Vector-Like T Quarks Decaying To Top Quarks And Higgs Bosons In The All-Hadronic Channel Using Jet Substructure, Vardan Khachatryan, Marc M. Baarmand, Marcus Hohlmann, H. Kalakhety, Francisco X. Yumiceva, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search is performed for a vector-like heavy T quark that is produced in pairs and that decays to a top quark and a Higgs boson. The data analyzed correspond to an integrated luminosity of 19.7 fb−1 collected with the CMS detector in proton-proton collisions at √s= 8 TeV. For T quarks with large mass values the top quarks and Higgs bosons can have significant Lorentz boosts, so that their individual decay products often overlap and merge. Methods are applied to resolve the substructure of such merged jets. Upper limits on the production cross section of a T quark with …
Shock Interaction With One-Dimensional Array Of Particles In Air, P. Sridharan, Thomas L. Jackson, J. Zhang, S. Balachandar
Shock Interaction With One-Dimensional Array Of Particles In Air, P. Sridharan, Thomas L. Jackson, J. Zhang, S. Balachandar
Aerospace, Physics, and Space Science Faculty Publications
In this paper, we present axisymmetric numerical simulations of shock propagation in air over an aluminum particle for Mach numbers up to 10. The numerical method is a finite-volume based solver on a Cartesian grid that allows for multi-material interfaces and shocks. Validation of the solver is demonstrated by comparing to existing experimental data. We compute the unsteady inviscid drag coefficient as a function of time, and show that when normalized by post-shock conditions, the maximum drag coefficient decreases with Mach number. Furthermore, for supercritical Mach numbers, we show that the inviscid steady-state drag asymptotes to a non-zero value due …
Search For Physics Beyond The Standard Model In Events With Two Leptons, Jets, And Missing Transverse Momentum In Pp Collisions At √S= 8 Tev, Vardan Khachatryan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva, The Cms Collaboration
Search For Physics Beyond The Standard Model In Events With Two Leptons, Jets, And Missing Transverse Momentum In Pp Collisions At √S= 8 Tev, Vardan Khachatryan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search is presented for physics beyond the standard model in final states with two opposite-sign same-flavor leptons, jets, and missing transverse momentum. The data sample corresponds to an integrated luminosity of 19.4 fb−1 of proton-proton collisions at √S= 8 TeV collected with the CMS detector at the CERN LHC in 2012. The analysis focuses on searches for a kinematic edge in the invariant mass distribution of the oppositesign same-flavor lepton pair and for final states with an on-shell Z boson. The observations are consistent with expectations from standard model processes and are interpreted in terms of upper limits on …
Erratum To: Search For New Physics In Events With Same-Sign Dileptons And Jets In Pp Collisions At S√ = 8 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva
Erratum To: Search For New Physics In Events With Same-Sign Dileptons And Jets In Pp Collisions At S√ = 8 Tev, The Cms Collaboration, S. Chatrchyan, V. Khachatryan, Marc M. Baarmand, B. Dorney, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
We update the parameters of the fitted functions for lepton and jet selection efficiencies presented in section 9 of the original paper. Due to an editorial error, these numbers were wrongly inserted. The corresponding figures, figures 10 and 11 of the original paper, showing the fitted functions, are unchanged.
Measurement Of The Ratio Of The Production Cross Sections Times Branching Fractions Of B ± C → J/Ψπ ± And B± → J/Ψk ± And B(B±C→J/Ψπ±Π±Π∓)/B(B±C→J/Ψπ±) In Pp Collisions At S√=7 Tev, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva
Measurement Of The Ratio Of The Production Cross Sections Times Branching Fractions Of B ± C → J/Ψπ ± And B± → J/Ψk ± And B(B±C→J/Ψπ±Π±Π∓)/B(B±C→J/Ψπ±) In Pp Collisions At S√=7 Tev, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
The ratio of the production cross sections times branching fractions (σ(B±c)B(B±c→J/ψπ±))/(σ(B±)B(B±→J/ψK±)) is studied in proton-proton collisions at a center of-mass energy of 7 TeV with the CMS detector at the LHC. The kinematic region investigated requires B c ± and B± mesons with transverse momentum p T > 15 GeV and rapidity |y|< 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb-1. The ratio is determined to be [0.48±0.05(stat)± 0.03(syst)±0.05 (τBc)]%. The B c ± → J/ψπ ± π ± π ∓ decay is …
Search For Third-Generation Scalar Leptoquarks In The Tτ Channel In Proton-Proton Collisions At √S = 8 Tev, Vardan Khachatryan, Vallary Bhopatkar, Marcus Hohlmann, Himali Kalakhety, Darren Mareskas-Palcek, Tuhin S. Roy, Francisco Yumiceva, The Cms Collaboration
Search For Third-Generation Scalar Leptoquarks In The Tτ Channel In Proton-Proton Collisions At √S = 8 Tev, Vardan Khachatryan, Vallary Bhopatkar, Marcus Hohlmann, Himali Kalakhety, Darren Mareskas-Palcek, Tuhin S. Roy, Francisco Yumiceva, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
A search for pair production of third-generation scalar leptoquarks decaying to top quark and τ lepton pairs is presented using proton-proton collision data at a center-of-mass energy of √s = 8 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb−1. The search is performed using events that contain an electron or a muon, a hadronically decaying τ lepton, and two or more jets. The observations are found to be consistent with the standard model predictions. Assuming that all leptoquarks decay to a top quark and a τ lepton, the existence of …
Searches For Third-Generation Squark Production In Fully Hadronic Final States In Proton-Proton Collisions At √S = 8 Tev, Vardan Khachatryan, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D. Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, The Cms Collaboration
Searches For Third-Generation Squark Production In Fully Hadronic Final States In Proton-Proton Collisions At √S = 8 Tev, Vardan Khachatryan, Vallary Bhopatkar, Marcus Hohlmann, H Kalakhety, D. Mareskas-Palcek, Tuhin S. Roy, Francisco X. Yumiceva, The Cms Collaboration
Aerospace, Physics, and Space Science Faculty Publications
Searches for third-generation squarks in fully hadronic final states are presented using data samples corresponding to integrated luminosities of 19.4 or 19.7 fb−1, collected at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Three mutually exclusive searches are presented, each optimized for a different decay topology. They include a multijet search requiring one fully reconstructed top quark, a dijet search requiring one or two jets originating from b quarks, and a monojet search. No excesses above the standard model expectations are seen, and limits are set on top and bottom squark production in the context …
Search For Disappearing Tracks In Proton-Proton Collisions At S√=8 Tev, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva
Search For Disappearing Tracks In Proton-Proton Collisions At S√=8 Tev, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Marcus Hohlmann, Himali Kalakhety, Francisco Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
A search is presented for long-lived charged particles that decay within the CMS detector and produce the signature of a disappearing track. Disappearing tracks are identified as those with little or no associated calorimeter energy deposits and with missing hits in the outer layers of the tracker. The search uses proton-proton collision data recorded at s√=8 TeV that corresponds to an integrated luminosity of 19.5 fb−1. The results of the search are interpreted in the context of the anomaly-mediated supersymmetry breaking (AMSB) model. The number of observed events is in agreement with the background expectation, and limits are set on …
Search For A Light Charged Higgs Boson Decaying To Cs In Pp Collisions At P S = 8 Tev, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, Himali Kalakhety, Daniel Noonan, Tuhin Roy, Francisco Yumiceva
Search For A Light Charged Higgs Boson Decaying To Cs In Pp Collisions At P S = 8 Tev, The Cms Collaboration, V. Khachatryan, A. M. Sirunyan, Marc M. Baarmand, Vallary Bhopatkar, Marcus Hohlmann, Himali Kalakhety, Daniel Noonan, Tuhin Roy, Francisco Yumiceva
Aerospace, Physics, and Space Science Faculty Publications
A measurement of the W boson helicity is presented, where the W boson originates from the decay of a top quark produced in pp collisions. The event selection, optimized for reconstructing a single top quark in the final state, requires exactly one isolated lepton (muon or electron) and exactly two jets, one of which is likely to originate from the hadronization of a bottom quark. The analysis is performed using data recorded at a center-of-mass energy of 8 TeV with the CMS detector at the CERN LHC in 2012. The data sample corresponds to an integrated luminosity of 19.7 fb …