Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- Hadronic decays (4)
- Branching fraction (3)
- Particle interactions (3)
- Particle production (3)
- Quarkonia (3)
-
- Lepton-lepton interactions (2)
- C01 electroweak model (1)
- C07 particle properties (1)
- C21 lepton collider experiments (1)
- Content Knowledge (1)
- Correlated electrons (1)
- Disorder (1)
- ETC (1)
- Electroweak symmetry breaking (1)
- Exotic mesons (1)
- Experimental particle physics (1)
- Form factors (1)
- Fragmentation into hadrons (1)
- Higgs bosons (1)
- Iridates (1)
- Jets (1)
- Kaons (1)
- Mesons (1)
- Particle decays (1)
- Particle phenomena (1)
- Particles and fields (1)
- Parton Distribution Functions (1)
- Perturbative qcd (1)
- Phenomenological models (1)
- Polarization (1)
Articles 1 - 30 of 30
Full-Text Articles in Physics
Cteq-Tea Parton Distribution Functions With Intrinsic Charm, Marco Guzzi, Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Joey Huston, Pavel Nadolsky, Carl Schmidt, Jan Winter, Keping Xie, C.-P. Yuan
Cteq-Tea Parton Distribution Functions With Intrinsic Charm, Marco Guzzi, Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Joey Huston, Pavel Nadolsky, Carl Schmidt, Jan Winter, Keping Xie, C.-P. Yuan
Faculty and Research Publications
We present a study in which the possibility of a (sizable) nonperturbative contribution to the charm parton distribution function (PDF) in a nucleon is investigated together with theoretical issues arising in its interpretation. The separation of the universal component of the nonperturbative charm from the rest of the radiative contributions is also discussed. We illustrate the potential impact of a nonperturbative charm PDF on LHC scattering processes. An estimate of nonperturbative charm magnitude in the CT14 and CT14HERA2 global QCD analyses at the next-to-next-to leading order (NNLO) in the QCD coupling strength is given by including the latest experimental data …
Parity-Time Symmetry In Optical Microcavity Systems, Jianming Wen, Xiaoshun Jiang, Liang Jiang, Min Xiao
Parity-Time Symmetry In Optical Microcavity Systems, Jianming Wen, Xiaoshun Jiang, Liang Jiang, Min Xiao
Faculty and Research Publications
Canonical quantum mechanics postulates Hermitian Hamiltonians to ensure real eigenvalues. Counterintuitively, a non-Hermitian Hamiltonian, satisfying combined parity-time (PT) symmetry, could display entirely real spectra above some phase-transition threshold. This stems from the existence of a parameter in the Hamiltonian governing characteristics features of eigenvalues and eigenfunctions. Varying this parameter causes real eigenvalues to coalesce and become complex conjugate pairs, signaling the occurrence of a nontrivial phase transition and the breakdown of PT symmetry. Such an appealing discovery has aroused extensive theoretical interest in extending canonical quantum theory by including non-Hermitian but PT-symmetric operators in the last two decades. Despite much …
Observation Of Y(4s)→N′Y(1s), Belle Collaboration, Ratnappuli Luminda Kulasiri
Observation Of Y(4s)→N′Y(1s), Belle Collaboration, Ratnappuli Luminda Kulasiri
Faculty and Research Publications
We report the first observation of the hadronic transition Υ(4S)→η′Υ(1S), using 496 fb−1 data collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e−collider. We reconstruct the η′ meson through its decays to ρ0γ and to π+π−η, with η→γγ. We measure B(Υ(4S)→η′Υ(1S))=[3.43±0.88(stat)±0.21(syst)]×10−5, with a significance of 5.7σ.
Disorder Induced Power-Law Gaps In An Insulator-Metal Mott Transition, Zhenyu Wang, Yoshinori Okada, Jared O'Neal, Wenwen Zhou, Daniel Walkup, Chetan Dhital, Tom Hogan, Patrick Clancy, Young-June Kim, Y. F. Hu, Luiz H. Santos, Stephen D. Wilson, Nandini Trivedi, Vidya Madhavan
Disorder Induced Power-Law Gaps In An Insulator-Metal Mott Transition, Zhenyu Wang, Yoshinori Okada, Jared O'Neal, Wenwen Zhou, Daniel Walkup, Chetan Dhital, Tom Hogan, Patrick Clancy, Young-June Kim, Y. F. Hu, Luiz H. Santos, Stephen D. Wilson, Nandini Trivedi, Vidya Madhavan
Faculty and Research Publications
A correlated material in the vicinity of an insulator-metal transition (IMT) exhibits rich phenomenology and variety of interesting phases. A common avenue to induce IMTs in Mott insulators is doping, which inevitably leads to disorder. While disorder is well known to create electronic inhomogeneity, recent theoretical studies have indicated that it may play an unexpected and much more profound role in controlling the properties of Mott systems. Theory predicts that disorder might play a role in driving a Mott insulator across an IMT, with the emergent metallic state hosting a power law suppression of the density of states (with exponent …
Top Tagging: An Analytical Perspective, Mrinal Dasgupta, Marco Guzzi, Jacob Rowling, Gregory Soyez
Top Tagging: An Analytical Perspective, Mrinal Dasgupta, Marco Guzzi, Jacob Rowling, Gregory Soyez
Faculty and Research Publications
In this paper we study aspects of top tagging from first principles of QCD. We find that the method known as the CMS top tagger becomes collinear unsafe at high pt and propose variants thereof which are IRC safe, and hence suitable for analytical studies, while giving a comparable performance to the CMS tagger. We also develop new techniques to identify three-pronged jet substructure, based on adaptations of the Y-splitter method and its combination with grooming. A novel feature of our studies, relative to previous calculations of two-pronged substructure, is our use of triple-collinear splitting functions combined with all-order resummation, …
The Distribution And Lifetime Of Powerful Radio Galaxies As A Function Of Environment And Redshift, David Garofalo, Chandra B. Singh, Alexa Zack
The Distribution And Lifetime Of Powerful Radio Galaxies As A Function Of Environment And Redshift, David Garofalo, Chandra B. Singh, Alexa Zack
Faculty and Research Publications
Correlations between jet power and active time for z < 0.1 high excitation and low excitation radio galaxies are explored as well as evidence in favor of a specific, non-random distribution for these objects including mid-infrared emitting radio galaxies as a function of environment and redshift. In addition, so-called weak line radio galaxies with FRII jet morphology have been identified as a class of active galaxies in the process of shutting down. This paper identifies common features between these seemingly disparate phenomena described above for the population of radio galaxies, and strings them together by way of a simple phenomenological framework that has shed light on the radio loud/radio quiet dichotomy, the jet-disk connection, and the distribution of all active galaxies as a function of redshift.
Observation Of E +E − → Π +Π −Π 0Χb1,2(1p ) And Search For E +E √ − → Φχb1,2(1p ) At S =10.96—11.05 Gev, J. H. Yin Et Al., Ratnappuli L. Kulasiri
Observation Of E +E − → Π +Π −Π 0Χb1,2(1p ) And Search For E +E √ − → Φχb1,2(1p ) At S =10.96—11.05 Gev, J. H. Yin Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report searches for the processes e+e−→π+π−π0χbJ and e+e−→ϕχbJ (J=1,2) in the vicinity of the Υ(11020) resonance using energy scan data collected by the Belle experiment at the KEKB collider. We observe e+e−→π+π−π0χb1 and find evidence for e+e−→ωχb2 processes for data with center-of-mass energies from 10.96 to 11.05~GeV for the first time. The statistical significance for π+π−π0χb1 and ωχb2 are 6.1σ and 4.0σ, respectively. We investigate energy dependence of the e+e−→π+π−π0χbJ cross section and find that it is consistent with production of Υ(10860) and Υ(11020) resonances without significant non-resonant contribution. Assuming e+e−→π+π−π0χbJ proceeds via Υ(10860) and Υ(11020), the branching fraction …
Soft-Gluon Corrections In Top-Quark Production, Nikolaos Kidonakis
Soft-Gluon Corrections In Top-Quark Production, Nikolaos Kidonakis
Faculty and Research Publications
I review calculations of soft-gluon corrections for top-quark production in hadron collisions. I describe theoretical formalisms for their resummation and for finite-order expansions. I show that soft-gluon corrections are dominant for a large number of top-quark processes. I discuss top-antitop pair production as well as single-top production, including total cross sections and differential distributions, and compare with data from the LHC and the Tevatron. I also discuss top-quark production in association with charged Higgs bosons, Z bosons, and other particles in models of new physics.
Measurement Of Eta_C(1s), Eta_C(2s) And Non-Resonant Eta' Pi+ Pi- Production Via Two-Photon Collisions, Q. N. Xu Et Al., Ratnappuli L. Kulasiri
Measurement Of Eta_C(1s), Eta_C(2s) And Non-Resonant Eta' Pi+ Pi- Production Via Two-Photon Collisions, Q. N. Xu Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report the measurement of gamma gamma to eta_c(1S), eta_c(2S) to eta' pi+ pi- with eta' decays to gamma rho and eta pi+ pi- using 941 fb^{-1} of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The eta_c(1S) mass and width are measured to be M = [2984.6\pm0.7 (stat.)\pm2.2 (syst.)] MeV/c^{2} and \Gamma = [30.8^{+2.3}_{-2.2}~(stat.) \pm 2.5~(syst.)] MeV, respectively. First observation of eta_c(2S) to eta' pi+ pi- with a significance of 5.5sigma including systematic error is obtained, and the eta_c(2S) mass is measured to be M = [3635.1\pm3.7~(stat.)\pm2.9~(syst.)] MeV/c^{2}. The products of the two-photon decay width …
Measurement Of Time-Dependent C P Asymmetries In B 0 → K 0 S Η Γ Decays, H. Nakano Et Al., Ratnappuli L. Kulasiri
Measurement Of Time-Dependent C P Asymmetries In B 0 → K 0 S Η Γ Decays, H. Nakano Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report a measurement of time-dependent CP violation parameters in B0→K0Sηγ decays. The study is based on a data sample, containing 772×106B¯B pairs, that was collected at the Υ(4S)resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We obtain the CPviolation parameters of S=−1.32±0.77(stat)±0.36(syst) and A=−0.48±0.41(stat)±0.07(syst) for the invariant mass of the K0Sη system up to 2.1 GeV/c2.
Search For Υ ( 1 S , 2 S ) → Z + C Z ( ' ) C − And E + E − → Z + C Z ( ' ) C − At √ S = 10.52 , 10.58, And 10.867 Gev, S. Jia Et Al., Ratnappuli L. Kulasiri
Search For Υ ( 1 S , 2 S ) → Z + C Z ( ' ) C − And E + E − → Z + C Z ( ' ) C − At √ S = 10.52 , 10.58, And 10.867 Gev, S. Jia Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
The first search for double charged charmoniumlike state production in Υ(1S) and Υ(2S) decays and in e+e− annihilation at √s=10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in Υ(1S) and Υ(2S) decays [B(Υ(1S,2S)→Z+cZ(')−c)×B(Z+c→π++c¯c) (c¯c=J/ψ, χc1(1P), ψ(2S))] and the product of Born cross section and branching fraction for e+e−→Z+cZ(')−c (σ(e+e−→Z+cZ(')−c)×B(Z+c→π++c¯c)) at √s=10.52, 10.58, and 10.867 GeV are determined. Here, Zc refers to the Zc(3900) and …
First Evidence For Cos2Β>0 And Resolution Of The Ckm Unitarity Triangle Ambiguity By A Time-Dependent Dalitz Plot Analysis Of B0→D(∗)H0 With D→K0sπ+Π− Decays, I. Adachi Et Al., Ratnappuli L. Kulasiri
First Evidence For Cos2Β>0 And Resolution Of The Ckm Unitarity Triangle Ambiguity By A Time-Dependent Dalitz Plot Analysis Of B0→D(∗)H0 With D→K0sπ+Π− Decays, I. Adachi Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the CKM Unitarity Triangle using a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→K0Sπ+π− decays, where h0∈{π0,η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BaBar and Belle experiments collected at the Υ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×106BB¯ pairs recorded by the BaBar detector and (772±11)×106BB¯ pairs recorded by the Belle detector. The results …
Production Cross Sections Of Hyperons And Charmed Baryons From E + E − Annihilation Near √ S = 10.52 Gev, M. Niiyama Et Al., D. Joffe, Ratnappuli L. Kulasiri
Production Cross Sections Of Hyperons And Charmed Baryons From E + E − Annihilation Near √ S = 10.52 Gev, M. Niiyama Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We measure the inclusive production cross sections of hyperons and charmed baryons from e+e−annihilation using a 800 fb−1 data sample taken near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The feed-down contributions from heavy particles are subtracted using our data, and the direct production cross sections are presented for the first time. The production cross sections divided by the number of spin states for S=−1 hyperons follow an exponential function with a single slope parameter except for the Σ(1385)+ resonance. Suppression for Σ(1385)+ and Ξ(1530)0 hyperons is observed. Among the production cross sections of …
Measurement Of Cos2Β In B0→D(∗)H0 With D→K0sπ+Π− Decays By A Combined Time-Dependent Dalitz Plot Analysis Of Babar And Belle Data, I. Adachi Et Al., Ratnappuli L. Kulasiri
Measurement Of Cos2Β In B0→D(∗)H0 With D→K0sπ+Π− Decays By A Combined Time-Dependent Dalitz Plot Analysis Of Babar And Belle Data, I. Adachi Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report measurements of sin2β and cos2β from a time-dependent Dalitz plot analysis of B0→D(∗)h0 with D→K0Sπ+π−decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis is performed with a combination of the final data sets of the \babar\ and Belle experiments containing 471×106 and 772×106 BB¯ pairs collected at the Υ(4S)resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat.)±0.06(syst.)±0.03(model) and cos2β=0.91±0.22(stat.)±0.09(syst.)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat.)±1.2(syst.)±0.6(model))∘. The last quoted uncertainties are due to the composition of the …
Measurement Of The Branching Fraction Of B → D(∗)Π`Ν At Belle Using Hadronic Tagging In Fully Reconstructed Events, A. Vossen Et Al.
Measurement Of The Branching Fraction Of B → D(∗)Π`Ν At Belle Using Hadronic Tagging In Fully Reconstructed Events, A. Vossen Et Al.
Faculty and Research Publications
We report a measurement of the branching fraction of the decay B→D(∗)πℓν. The analysis uses 772×106 BB¯ pairs produced in e+e−→Υ(4S) data recorded by the Belle experiment at the KEKB asymmetric-energy e+e− collider. The tagging B meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay B→D(∗)πℓν (ℓ=e,μ). The measured branching fractions are (B+→D−π+ℓ+ν) = [4.55 ± 0.27 (stat.) ± 0.39 (syst.)]×10−3, (B0→D¯0π−ℓ+ν) = [4.05 ± 0.36 (stat.) ± 0.41 (syst.)]×10−3, (B+→D∗−π+ℓ+ν) = [6.03 ± 0.43 (stat.) ± 0.38 (syst.)]×10−3, and (B0→D¯∗0π−ℓ+ν) = [6.46 ± 0.53 (stat.) ± 0.52 (syst.)]×10−3. …
Observation Of Υ(4s)→Η′Υ(1s), E. Guido Et Al., Ratnappuli L. Kulasiri
Observation Of Υ(4s)→Η′Υ(1s), E. Guido Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report the first observation of the hadronic transition Υ(4S)→η′Υ(1S), using 496 fb−1 data collected at the Υ(4S)resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We reconstruct the η′ meson through its decays to ρ0γ and to π+π−η, with η→γγ. We measure: (Υ(4S)→η′Υ(1S))=(3.43±0.88(stat.)±0.21(syst.))×10−5, with a significance of 5.7σ.
Observation Of Excited Ω C Charmed Baryons In E + E − Collisions, J. Yelton, Ratnappuli L. Kulasiri
Observation Of Excited Ω C Charmed Baryons In E + E − Collisions, J. Yelton, Ratnappuli L. Kulasiri
Faculty and Research Publications
Using the entire Belle data sample of 980 fb−1 of e+e− collisions, we present the results of a study of excited Ωc charmed baryons in the decay mode Ξ+cK−. We show confirmation of four of the five narrow states reported by the LHCb Collaboration: the Ωc(3000), Ωc(3050), Ωc(3066), and Ωc(3090).
Observation Of Ξc(2930)0 And Updated Measurement Of B−→K−Λ+Cλ¯−C At Belle, Y. B. Li Et Al., Ratnappuli L. Kulasiri
Observation Of Ξc(2930)0 And Updated Measurement Of B−→K−Λ+Cλ¯−C At Belle, Y. B. Li Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report the first observation of the Ξc(2930)0" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">Ξc(2930)0Ξc(2930)0 charmed-strange baryon with a significance greater than 5σ" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">σσ. The Ξc(2930)0" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: …
Study Of K 0 S Pair Production In Single-Tag Two-Photon Collisions, M. Masuda Et Al., Ratnappuli L. Kulasiri
Study Of K 0 S Pair Production In Single-Tag Two-Photon Collisions, M. Masuda Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report a measurement of the cross section for K0S pair production in single-tag two-photon collisions, γ∗γ→K0SK0S, for Q2 up to 30 GeV2, where Q2 is the negative of the invariant mass squared of the tagged photon. The measurement covers the kinematic range 1.0 GeV
Measurement Of The Τ Michel Parameters Η¯ And Ξκ In The Radiative Leptonic Decay Τ−→ℓ−Ντν¯ℓγ, N. Shimizu Et Al., Ratnappuli L. Kulasiri
Measurement Of The Τ Michel Parameters Η¯ And Ξκ In The Radiative Leptonic Decay Τ−→ℓ−Ντν¯ℓγ, N. Shimizu Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We present a measurement of the Michel parameters of the τ lepton, η¯ and ξκ , in the radiative leptonic decay τ−→ℓ−ντν¯ℓγ using 711 f b−1 of collision data collected with the Belle detector at the KEKB e+e− collider. The Michel parameters are measured in an unbinned maximum likelihood fit to the kinematic distribution of e+e−→τ+τ−→(π+π0ν¯τ)(ℓ−ντν¯ℓγ) (ℓ=e or μ) . The measured values of the Michel parameters are η¯=−1.3±1.5±0.8 and ξκ=0.5±0.4±0.2 , where the first error is statistical and the second is systematic. This is the first measurement of these parameters. These results are consistent with the Standard Model predictions …
Measurement Of The Decays Λc→Σππ At Belle, M. Berger Et Al., Ratnappuli L. Kulasiri
Measurement Of The Decays Λc→Σππ At Belle, M. Berger Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report measurements of the branching fractions of the decays Λ+c→Σ+π−π+, Λ+c→Σ0π+π0 and Λ+c→Σ+π0π0 relative to the reference channel Λ+c→pK−π+. The analysis is based on the full data sample collected at and close to Υ(4S)resonance by the Belle detector at the KEKB asymmetric-energy e+e− collider corresponding to the integrated luminosity of 711 fb−1. We measure (Λ+c→Σ+π−π+)/(Λ+c→pK−π+)=0.706 ±0.003 ±0.029, (Λ+c→Σ0π+π0)/(Λ+c→pK−π+)=0.491 ±0.005 ±0.028 and (Λ+c→Σ+π0π0)/(Λ+c→pK−π+)=0.198 ±0.006 ±0.016. The listed uncertainties are statistical and systematic, respectively.
Ct14 Intrinsic Charm Parton Distribution Functions From Cteq-Tea Global Analysis, Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Marco Guzzi, Joey Huston, Pavel Nadolsky, Carl Schmidt, Jan Winter, Keping Xie, C.-P. Yuan
Ct14 Intrinsic Charm Parton Distribution Functions From Cteq-Tea Global Analysis, Tie-Jiun Hou, Sayipjamal Dulat, Jun Gao, Marco Guzzi, Joey Huston, Pavel Nadolsky, Carl Schmidt, Jan Winter, Keping Xie, C.-P. Yuan
Faculty and Research Publications
We investigate the possibility of a (sizable) nonperturbative contribution to the charm parton distribution function (PDF) in a nucleon, theoretical issues arising in its interpretation, and its potential impact on LHC scattering processes. The “fitted charm” PDF obtained in various QCD analyses contains a process-dependent component that is partly traced to power-suppressed radiative contributions in DIS and is generally different at the LHC. We discuss separation of the universal component of the nonperturbative charm from the rest of the radiative contributions and estimate its magnitude in the CT14 global QCD analysis at the next-to-next-to leading order in the QCD coupling …
Measurement Of Branching Fractions Of Hadronic Decays Of The Ω 0 C Baryon, J. Yelton Et Al., D. Joffe, Ratnappuli L. Kulasiri
Measurement Of Branching Fractions Of Hadronic Decays Of The Ω 0 C Baryon, J. Yelton Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
Using a data sample of 980 fb−1 of e+e− annihilation data taken with the Belle detector operating at the KEKB asymmetric-energy e+e− collider, we report the results of a study of the decays of the Ω0ccharmed baryon into hadronic final states. We report the most precise measurements to date of the relative branching fractions of the Ω0c into Ω−π+π0, Ω−π+π−π+, Ξ−K−π+π+, and Ξ0K−π+, as well as the first measurements of the branching fractions of the Ω0c into Ξ−¯K0π+, Ξ0¯K0, and Λ¯K0¯K0, all with respect to the Ω−π+ decay. In addition, we investigate the resonant substructure of these modes. Finally, we …
Higher-Order Corrections For T Z Production Via Anomalous Couplings, Nikolaos Kidonakis
Higher-Order Corrections For T Z Production Via Anomalous Couplings, Nikolaos Kidonakis
Faculty and Research Publications
I present higher-order corrections from soft-gluon emission for the associated production of a top quark with a Z boson via anomalous t−q−Z couplings at LHC energies. Approximate next-to-next-to-leading order (aNNLO) double-differential cross sections are derived from soft-gluon resummation at next-to-leading-logarithm accuracy. The total tZ production cross sections and the top-quark transverse-momentum and rapidity distributions are calculated at aNNLO for various LHC energies. It is shown that the soft-gluon corrections are dominant and large for this process.
Search For C P Violation In The D + → Π + Π 0 Decay At Belle, V. Babu Et Al., D. Joffe, Ratnappuli L. Kulasiri
Search For C P Violation In The D + → Π + Π 0 Decay At Belle, V. Babu Et Al., D. Joffe, Ratnappuli L. Kulasiri
Faculty and Research Publications
We search for CP violation in the charged charm meson decay D+→π+π0, based on a data sample corresponding to an integrated luminosity of 921 fb−1 collected by the Belle experiment at the KEKB e+e− asymmetric-energy collider. The measured CP-violating asymmetry is [+2.31±1.24(stat)±0.23(syst)]%, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results.
Angular Analysis Of The E + E − → Dðþd∓ Process Near The Open Charm Threshold Using Initial-State Radiation, V. Zhukova Et Al., Ratnappuli L. Kulasiri
Angular Analysis Of The E + E − → Dðþd∓ Process Near The Open Charm Threshold Using Initial-State Radiation, V. Zhukova Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We report a new measurement of the exclusive e+e−→D(*)±D*∓ cross sections as a function of the center-of-mass energy from the D(*)±D*∓ threshold through √s=6.0 GeV, using the initial-state radiation technique. The analysis is based on a data sample collected with the Belle detector with an integrated luminosity of 951 fb−1. The accuracy of the cross section measurement is increased by a factor of 2 over the first Belle study. We perform the first angular analysis of the e+e−→D*±D*∓process and decompose this exclusive cross section into three components corresponding to the D∗helicities.
Analysis Of Praxis Physics Subject Assessment Examinees And Performance: Who Are Our Prospective Physics Teachers?, Herman Ray
Faculty and Research Publications
A generally agreed upon tenant of the physics teaching community is the centrality of subject-specific expertise in effective teaching. However, studies which assess the content knowledge of incoming K–12 physics teachers in the U.S. have not yet been reported. Similarly lacking are studies on if or how the demographic makeup of aspiring physics educators is different from previously reported analyses of the actual high school physics teaching workforce. Here we present findings about the demographics and subject knowledge of prospective high school physics teachers using data from Praxis physics subject assessments administered between 2006 and 2016. Our analysis reveals significant …
Measurement Of The Τ Lepton Polarization And R ( D ∗ ) In The Decay ¯ B → D ∗ Τ − ¯ Ν Τ With One-Prong Hadronic Τ Decays At Belle, S. Hirose Et Al., Ratnappuli L. Kulasiri
Measurement Of The Τ Lepton Polarization And R ( D ∗ ) In The Decay ¯ B → D ∗ Τ − ¯ Ν Τ With One-Prong Hadronic Τ Decays At Belle, S. Hirose Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
With the full data sample of 772×106 B¯B pairs recorded by the Belle detector at the KEKB electron-positron collider, the decay ¯B→D∗τ−¯ντ is studied with the hadronic τ decays τ−→π−ντ and τ−→ρ−ντ. The τ polarization Pτ(D∗) in two-body hadronic τ decays is measured, as well as the ratio of the branching fractions R(D∗)=B(¯B→D∗τ−¯ντ)/B(¯B→D∗ℓ−¯νℓ), where ℓ− denotes an electron or a muon. Our results, Pτ(D∗)=−0.38±0.51(stat)+0.21−0.16(syst) and R(D∗)=0.270±0.035(stat)+0.028−0.025(syst), are consistent with the theoretical predictions of the standard model. The polarization values of Pτ(D∗)>+0.5 are excluded at the 90% confidence level.
Inclusive Study Of Bottomonium Production In Association With An Η Meson In E+E− Annihilations Near Υ(5s), U. Tamponi Et Al., Ratnappuli L. Kulasiri
Inclusive Study Of Bottomonium Production In Association With An Η Meson In E+E− Annihilations Near Υ(5s), U. Tamponi Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We study bottomonium production in association with an η meson in e+e− annihilations near the Υ(5S), at a center of mass energy of s√=10.866GeV. The results are based on the 121.4fb−1 data sample collected by the Belle experiment at the asymmetric energy KEKB collider. Only the η meson is reconstructed and the missing-mass spectrum of η candidates is investigated. We observe the e+e−→ηΥJ(1D) process and find evidence for the e+e−→ηΥ(2S) process, while no significant signals of Υ(1S), hb(1P), nor hb(2P) are found. Cross sections for the studied processes are reported.
Measurements Of The Absolute Branching Fractions Of B + → X C ¯ C K + And B + → ¯ D ( * ) 0 Π + At Belle, Y. Kato Et Al., Ratnappuli L. Kulasiri
Measurements Of The Absolute Branching Fractions Of B + → X C ¯ C K + And B + → ¯ D ( * ) 0 Π + At Belle, Y. Kato Et Al., Ratnappuli L. Kulasiri
Faculty and Research Publications
We present the measurement of the absolute branching fractions of B+→Xc¯cK+ and B+→¯D(*)0π+decays, using a data sample of 772×106 B¯B pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. Here, Xc¯c denotes ηc, J/ψ, χc0, χc1, ηc(2S), ψ(2S), ψ(3770), X(3872), and X(3915). We do not observe significant signals for X(3872) or X(3915) and set the 90% confidence level upper limits at B(B+→X(3872)K+)<2.6×10−4 and B(B+→X(3915)K+)<2.8×10−4. These represent the most stringent upper limit for B(B+→X(3872)K+) to date and the first limit for B(B+→X(3915)K+). The measured branching fractions for ηc and ηc(2S) are the most precise to date, B(B+→ηcK+)=(12.0±0.8±0.7)×10−4and B(B+→ηc(2S)K+)=(4.8±1.1±0.3)×10−4, where the first and second uncertainties are statistical and systematic, respectively.