Open Access. Powered by Scholars. Published by Universities.®

Physics Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 30 of 171

Full-Text Articles in Physics

Fr0 Radio Galaxies And Their Place In The Radio Morphology Classification, David Garofalo, Chandra B. Singh Feb 2019

Fr0 Radio Galaxies And Their Place In The Radio Morphology Classification, David Garofalo, Chandra B. Singh

Faculty Publications

So-called FR0 radio galaxies have recently emerged as a family of active galaxies with all the same properties as FRI radio galaxies except for their ratio of core to total emission, which is about 30 times higher than that of FRI sources. We show how their properties fit within the gap paradigm as low, prograde, spinning black holes whose progenitors are powerful FRII quasars that transitioned rapidly from the cold mode into advection-dominated accretion over a few million years. The prediction is that if sufficient fuel exists, FR0 radio galaxies will evolve into full-fledged FRI radio galaxies and the observational ...


Parity-Time Symmetry In Optical Microcavity Systems, Jianming Wen, Xiaoshun Jiang, Liang Jiang, Min Xiao Oct 2018

Parity-Time Symmetry In Optical Microcavity Systems, Jianming Wen, Xiaoshun Jiang, Liang Jiang, Min Xiao

Faculty 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 Oct 2018

Observation Of Y(4s)→N′Y(1s), Belle Collaboration, Ratnappuli Luminda Kulasiri

Faculty 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 Oct 2018

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 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 ...


The Distribution And Lifetime Of Powerful Radio Galaxies As A Function Of Environment And Redshift, David Garofalo, Chandra B. Singh, Alexa Zack Sep 2018

The Distribution And Lifetime Of Powerful Radio Galaxies As A Function Of Environment And Redshift, David Garofalo, Chandra B. Singh, Alexa Zack

Faculty 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 Jun 2018

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 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 ...


Soft-Gluon Corrections In Top-Quark Production, Nikolaos Kidonakis Jun 2018

Soft-Gluon Corrections In Top-Quark Production, Nikolaos Kidonakis

Faculty 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 May 2018

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 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 ...


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 May 2018

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 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 ...


Measurement Of Time-Dependent C P Asymmetries In B 0 → K 0 S Η Γ Decays, H. Nakano Et Al., Ratnappuli L. Kulasiri May 2018

Measurement Of Time-Dependent C P Asymmetries In B 0 → K 0 S Η Γ Decays, H. Nakano Et Al., Ratnappuli L. Kulasiri

Faculty 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.


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 Apr 2018

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 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 ...


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 Apr 2018

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 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 ...


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 Apr 2018

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 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 ...


Observation Of Ξc(2930)0 And Updated Measurement Of B−→K−Λ+Cλ¯−C At Belle, Y. B. Li Et Al., Ratnappuli L. Kulasiri Mar 2018

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 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 ...


Observation Of Υ(4s)→Η′Υ(1s), E. Guido Et Al., Ratnappuli L. Kulasiri Mar 2018

Observation Of Υ(4s)→Η′Υ(1s), E. Guido Et Al., Ratnappuli L. Kulasiri

Faculty 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.


Measurement Of The Branching Fraction Of B → D(∗)Π`Ν At Belle Using Hadronic Tagging In Fully Reconstructed Events, A. Vossen Et Al. Mar 2018

Measurement Of The Branching Fraction Of B → D(∗)Π`Ν At Belle Using Hadronic Tagging In Fully Reconstructed Events, A. Vossen Et Al.

Faculty 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 ...


Study Of K 0 S Pair Production In Single-Tag Two-Photon Collisions, M. Masuda Et Al., Ratnappuli L. Kulasiri Mar 2018

Study Of K 0 S Pair Production In Single-Tag Two-Photon Collisions, M. Masuda Et Al., Ratnappuli L. Kulasiri

Faculty 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


Observation Of Excited Ω C Charmed Baryons In E + E − Collisions, J. Yelton, Ratnappuli L. Kulasiri Mar 2018

Observation Of Excited Ω C Charmed Baryons In E + E − Collisions, J. Yelton, Ratnappuli L. Kulasiri

Faculty 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).


Measurement Of The Decays Λc→Σππ At Belle, M. Berger Et Al., Ratnappuli L. Kulasiri Feb 2018

Measurement Of The Decays Λc→Σππ At Belle, M. Berger Et Al., Ratnappuli L. Kulasiri

Faculty 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 ...


Measurement Of Branching Fractions Of Hadronic Decays Of The Ω 0 C Baryon, J. Yelton Et Al., D. Joffe, Ratnappuli L. Kulasiri Feb 2018

Measurement Of Branching Fractions Of Hadronic Decays Of The Ω 0 C Baryon, J. Yelton Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty 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 ...


Higher-Order Corrections For T Z Production Via Anomalous Couplings, Nikolaos Kidonakis Feb 2018

Higher-Order Corrections For T Z Production Via Anomalous Couplings, Nikolaos Kidonakis

Faculty 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.


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 Feb 2018

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 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 ...


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 Feb 2018

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 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 ...


Search For C P Violation In The D + → Π + Π 0 Decay At Belle, V. Babu Et Al., D. Joffe, Ratnappuli L. Kulasiri Jan 2018

Search For C P Violation In The D + → Π + Π 0 Decay At Belle, V. Babu Et Al., D. Joffe, Ratnappuli L. Kulasiri

Faculty 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.


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 Jan 2018

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 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 ...


Angular Analysis Of The E + E − → Dðþd∓ Process Near The Open Charm Threshold Using Initial-State Radiation, V. Zhukova Et Al., Ratnappuli L. Kulasiri Jan 2018

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 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 ...


Analysis Of Praxis Physics Subject Assessment Examinees And Performance: Who Are Our Prospective Physics Teachers?, Herman Ray Jan 2018

Analysis Of Praxis Physics Subject Assessment Examinees And Performance: Who Are Our Prospective Physics Teachers?, Herman Ray

Faculty 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 ...


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 Jan 2018

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 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.


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 Jan 2018

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 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 ...


Search For Light Tetraquark States In Υ ( 1 S ) And Υ ( 2 S ) Decays, S. Jia Et Al., David Joffe, Ratnappuli L. Kulasiri Dec 2017

Search For Light Tetraquark States In Υ ( 1 S ) And Υ ( 2 S ) Decays, S. Jia Et Al., David Joffe, Ratnappuli L. Kulasiri

Faculty Publications

We search for the JPC=0−− and 1+− light tetraquark states with masses up to 2.46 GeV/c2 in Υ(1S) and Υ(2S) decays with data samples of (102±2) million and (158±4) million events, respectively, collected with the Belle detector. No significant signals are observed in any of the studied production modes, and 90% credibility level (C.L.) upper limits on their branching fractions in Υ(1S)and Υ(2S) decays are obtained. The inclusive branching fractions of the Υ(1S) and Υ(2S) decays into final states with f1(1285) are measured to be B ...