Kolcu, Onur Buğra
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Kolcu, O. B.; Kolcu, B.; Ciambrone, P.; Kolc, O. B.; Kolcu, . B.; Kolcu, Onur Bugra
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Dr. Öğr. Üyesi
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06. Meslek Yüksekokulu
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Former Staff
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Documents
277
Citations
1299
h-index
16
Documents
634
Citations
10438
Scholarly Output
337
Articles
335
Views / Downloads
43/1660
Supervised MSc Theses
0
Supervised PhD Theses
0
WoS Citation Count
7427
Scopus Citation Count
9833
WoS h-index
47
Scopus h-index
54
Patents
0
Projects
0
WoS Citations per Publication
22.04
Scopus Citations per Publication
29.18
Open Access Source
332
Supervised Theses
0
| Journal | Count |
|---|---|
| Physical Review D | 195 |
| Physical Review Letters | 59 |
| Physics Letters B | 25 |
| Journal of High Energy Physics | 19 |
| Chinese Physics C | 17 |
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337 results
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Now showing 1 - 10 of 337
Article Citation - WoS: 35Citation - Scopus: 38Observation of the Semileptonic Decay D-0 -> a(0)(980)(-)e(+)nu(e) and Evidence for D+ -> a(0)(980)(0)e(+)nu(e)(American Physical Society, 2018) Kolcu, Onur Buğra; Kolcu, Onur Buğra; The BESIII collaborationUsing an e(+)e(-) collision data sample of 2.93 fb(-1) collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of D-0 -> a(0)(980)(-)e(+)nu(e) and evidence for D+ -> a(0)(980)(0)e(+)nu(e) with significances of 6.4 sigma and 2.9 sigma, respectively. The absolute branching fractions are determined to be B(D-0 -> a(0)(980)(-)e(+)nu(e)) x B(a(0)(980)(-) -> eta pi(-)) = [1.33(-0.29)(+0.33)(stat) +/- 0.09(syst)] x 10(-4) and B(D+ -> a(0)(980)(0)e(+)nu(e)) x B(a(0)(980)(0) -> eta pi(0)) = [1.66(-0.66)(+0.81)(stat) +/- 0.11(syst) x 10(-4). This is the first time the a(0)(980) meson has been measured in a D-0 semileptonic decay, which would open one more interesting page in the investigation of the nature of the puzzling a(0)(980) states.Article Citation - WoS: 5Citation - Scopus: 5Study of BESIII Trigger Efficiencies with the 2018 J/ψ Data(IOP Publishing Ltd, 2021) Kolcu, Onur Buğra; BESIII CollaborationUsing a dedicated data sample taken in 2018 on the J/psi peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches 100% in most cases, with uncertainties small enough not to affect most physics analyses.Article Citation - Scopus: 4Improved Measurements of χcJ → Σ+ Σ - and Σ0 Σ 0 Decays Improved Measurements of ... M. Ablikim et al.(American Physical Society, 2018) Collaboration, BESIII; Kolcu, O. B.Using a data sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays χcJ→Σ+Σ- and Σ0Σ0. The decays χc1,2→Σ+Σ- and Σ0Σ0 are observed for the first time, and the branching fractions for χc0→Σ+Σ- and Σ0Σ0 decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry. © 2018 authors.Article Citation - WoS: 3Improved Measurements of XcJ → Σ+ (Σ)over-bar- and Σ0(Σ)over-bar0 Decays(American Physical Society, 2018) Kolcu, Onur Buğra; The BESIII collaborationUsing a data sample of (448.1 +/- 2.9) x 10(6) psi (3686) events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays X-cJ -> Sigma(+) (Sigma) over bar (-) and Sigma(0) (Sigma) over bar (0) The decays X-c1.2 -> Sigma(+) (Sigma) over bar (-) and Sigma (Sigma) over bar (0) are observed for the first time, and the branching fractions for X-c0 -> Sigma(+) (Sigma) over bar (-) and Sigma(0) (Sigma) over bar (0) decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry.Article Citation - WoS: 2Citation - Scopus: 2Observation of J=ψ Decays to e plus e - e plus e - and e plus e - μ plus μ -(American Physical Society, 2024) Kolcu, Onur Buğra; The BESIII collaborationUsing a data sample of 4.481 x 108 psi o3686 thorn events collected with the BESIII detector, we report the first observation of the four-lepton-decays J=psi -> e thorn e-e thorn e- and J=psi -> e thorn e-mu thorn mu- utilizing the process psi o3686 thorn -> pi thorn pi-J=psi. The branching fractions are determined to be 1/25.48 0.31ostat thorn 0.45osyst thorn x 10-5 and 1/23.53 0.22ostat thorn 0.13osyst thorn x 10-5, respectively. The results are consistent with theoretical predictions. No significant signal is observed for J=psi -> mu thorn mu-mu thorn mu-, and an upper limit on the branching fraction is set at 1.6 x 10-6 at the 90% confidence level. A CP asymmetry observable is constructed for the first two channels, which is measured to be o-0.012 0.054 0.010 thorn and o0.062 0.059 0.006 thorn , respectively. No evidence for CP violation is observed in this processArticle Citation - WoS: 48Citation - Scopus: 59Study of the Process e(+) e(-) -> p(p)over-bar via Initial State Radiation at BESIII(American Physical Society, 2019) Kolcu, Onur Buğra; Kolcu, Onur Buğra; The BESIII collaboration; BESIII Collaboration; BESIII CollaborationThe Born cross section for the process e(+) e(-)-> p (p) over bar is measured using the initial state radiation technique with an undetected photon. This analysis is based on datasets corresponding to an integrated luminosity of 75 fb(-1), collected with the BESIII detector at the BEPCII collider at center of mass energies between 3.773 and 4.600 GeV. The Born cross section for the process e(+) e(-)-> p (p) over bar and the proton effective form factor are determined in the p (p) over bar invariant mass range between 2.0 and 3.8 GeV/c(2) divided into 30 intervals. The proton form factor ratio (vertical bar G(E)vertical bar/vertical bar G(M)vertical bar) is measured in 3 intervals of the p (p ) over bar invariant mass between 2.0 and 3.0 GeV/c(2).Article Citation - WoS: 4Citation - Scopus: 5Amplitude analysis and branching fraction measurement of the decay Ds+ → π + π 0 π 0(Springer Science and Business Media Deutschland GmbH, 2022) Kolcu, Onur Buğra; Collaboration, BESIIIUsing a data set corresponding to an integrated luminosity of 6.32 fb−1 recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226 GeV, an amplitude analysis of the decay Ds+ → π+π0π0 is performed, and the relative fractions and phases of different intermediate processes are determined. The absolute branching fraction of the decay Ds+ → π+π0π0 is measured to be (0.50 ± 0.04stat ± 0.02syst)%. The absolute branching fraction of the intermediate process Ds+ → f0(980)π+, f0(980) → π0π0 is determined to be (0.28 ± 0.04stat ± 0.04syst)%. [Figure not available: see fulltext.] © 2022, The Author(s).Article Citation - WoS: 12Citation - Scopus: 20Study of the Dalitz Decay J/psi -> e(+)e(-)eta(Amer Physical Soc, 2019) Kolcu, Onur Buğra; Kolcu, Onur Buğra; The BESIII collaborationWe study the electromagnetic Dalitz decay J/psi -> e(+)e(-)eta and search for dielectron decays of a dark gauge boson (gamma') in J/psi -> gamma'eta with the two q decay modes eta -> gamma gamma and eta -> pi(+)pi(-)pi(0) using (1310.6 +/- 7.0) x 10(6) J/psi events collected with the BESIII detector. The branching fraction of J/psi -> e(+)e(-)eta is measured to be (1.43 +/- 0.04(stat) +/- 0.06(syst)) x 10(-5), with a precision that is improved by a factor of 1.5 over the previous BESIII measurement. The corresponding dielectron invariant mass dependent modulus square of the transition form factor is explored for the first time, and the pole mass is determined to be Lambda = 2.84 +/- 0.11(stat) +/- 0.08(syst) GeV/c(2). We find no evidence of gamma' production and set 90% confidence level upper limits on the product branching fraction B(J/psi -> gamma'eta) x B(gamma' -> e(+)e(-)) as well as the kinetic mixing strength between the standard model photon and gamma' in the mass range of 0.01 <= m(gamma') <= 2.4 GeV/c(2).Article Citation - WoS: 9Citation - Scopus: 6Study of the Decays psi(3686) -> gamma chi(cJ) -> gamma(p)over-barK*(+)Lambda + c.c. and psi(3686) -> (p)over-barK*(+) Lambda plus c.c.(Amer Physical Soc, 2019) Collaboration, BESIII; Kolcu, Onur BugraBased on the data sample of 448.1×106 ψ(3686) events collected with the BESIII detector at BEPCII, we present a study of the decays ψ(3686)→γχcJ→γp̄K∗+Λ+c.c. and ψ(3686)→p̄K∗+Λ+c.c. The branching fractions of χcJ→p̄K∗+Λ+c.c. (J=0, 1, 2) are measured to be (4.8±0.7±0.5)×10-4, (5.0±0.5±0.4)×10-4, and (8.2±0.9±0.7)×10-4, respectively, where the first uncertainties are statistical and the second systematic. The branching fraction of ψ(3686)→p̄K∗+Λ+c.c. is measured to be (6.3±0.5±0.5)×10-5. All these decay modes are observed for the first time. © 2019 authors. Published by the American Physical Society.Article Citation - WoS: 58Citation - Scopus: 71Amplitude Analysis of the ? 0 ? 0 System Produced in Radiative J=? Decays(Amer Physical Soc, 2015) The BESIII collaboration; Kolcu, Onur Buğra; Kolcu, Onur Buğra; The BESIII collaborationAn amplitude analysis of the pi(0)pi(0) system produced in radiative J/psi decays is presented. In particular, a piecewise function that describes the dynamics of the pi(0)pi(0) system is determined as a function of M pi(0)pi(0) from an analysis of the (1.311 +/- 0.011) x 10(9) J/psi decays collected by the BESIII detector. The goal of this analysis is to provide a description of the scalar and tensor components of the pi(0)pi(0) system while making minimal assumptions about the properties or number of poles in the amplitude. Such a model-independent description allows one to integrate these results with other related results from complementary reactions in the development of phenomenological models, which can then be used to directly fit experimental data to obtain parameters of interest. The branching fraction of J/psi -> pi(0)pi(0) is determined to be (1.15 +/- 0.05) x 10(-3), where the uncertainty is systematic only and the statistical uncertainty is negligible.
