1,721,781 research outputs found
Measurement of the e(+)e(-) -> pi(+)pi(-) Cross Section Between 600 and 900 MeV Using Initial State Radiation (vol 753, pg 629, 2016)
No full textIn Ref.[1] the BESIII collaboration published a cross section measurement of the process e(+)e(-) -> pi(+)pi(-) in the energy range between 600 and 900 MeV. In this corrigendum, we report a corrected evaluation of the statistical errors in terms of a fully propagated covariance matrix. The correction also yields a reduced statistical uncertainty for the hadronic vacuum polarization contribution to the anomalous magnetic moment of the muon, which now reads as a(mu)(pi pi,LO) (600 - 900 MeV) = (368.2 +/- 1.5(stat) +/- 3.3(syst)) x 10(-10). The central values of the cross section measurement and of a(mu)(pi pi,LO) , as well as the systematic uncertainties remain unchanged. (C) 2015 The Author(s). Published by Elsevier B.V. All rights reserved
Observation of X(2370) and search for X(2120) in J/ ψ→ γKK¯ η′ : BESIII Collaboration
No full textUsing a sample of 1.31x109J/psi events collected with the BESIII detector, we perform a study of J/psi -> gamma KKeta '. X(2370) is observed in the KKeta ' invariant-mass distribution with a statistical significance of 8.3 sigma. Its resonance parameters are measured to be M=2341.6 +/- 6.5(stat.)+/- 5.7(syst.)MeV/c2 and Gamma =117 +/- 10(stat.)+/- 8(syst.)MeV. The product branching fractions for J/psi -> gamma X(2370),X(2370)-> K+K-eta ' and J/psi -> gamma X(2370),X(2370)-> KS0KS0 eta ' are determined to be (1.79 +/- 0.23(stat.)+/- 0.65(syst.))x10-5 and (1.18 +/- 0.32(stat.)+/- 0.39(syst.))x10-5, respectively. No evident signal for X(2120) is observed in the KKeta ' invariant-mass distribution. The upper limits for the product branching fractions of B(J/psi -> gamma X(2120)-> gamma K+K-eta ') and B(J/psi -> gamma X(2120)-> gamma KS0KS0 eta ') are determined to be 1.49x10-5 and 6.38x10-6 at the 90% confidence level, respectively
Measurement of the absolute branching fraction of the inclusive decay Lambda c+-> KS0X: (BESIII Collaboration)
No full textWe report the first measurement of the absolute branching fraction of the inclusive decay Lambda c+-> KS0X. The analysis is performed using an e+e- collision data sample corresponding to an integrated luminosity of 567 pb-1 taken at s = 4.6 GeV with the BESIII detector. Using eleven Cabibbo-favored Lambda c- decay modes and the double-tag technique, this absolute branching fraction is measured to be B(Lambda c+-> KS0X)=(9.9 +/- 0.6 +/- 0.4)%, where the first uncertainty is statistical and the second systematic. The relative deviation between the branching fractions for the inclusive decay and the observed exclusive decays is (18.7 +/- 8.3)%, which indicates that there may be some unobserved decay modes with a neutron or excited baryons in the final state
Measurement of the Branching Fractions of the Cabibbo-favored Decays Λ<sub>c</sub><sup>+</sup> → Λ<i>k</i><sub>s</sub><sup>0</sup> <i>k</i><sup>+</sup> and Λ<sub>c</sub><sup>+</sup> → Ξ<sup>0</sup><i>k</i><sub>s</sub><sup>0</sup> Π<sup>+</sup> and Search for Λ<sub>c</sub><sup>+</sup> → Σ<sup>0</sup><i>k</i><sub>s</sub><sup>0</sup> <i>k</i><sup>+</sup>
No full textBased on e(+)e(-) collision data corresponding to an integrated luminosity of about 4.5 fb(-1) collected at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the absolute branching fraction of the Cabibbo-favored decay Lambda(+)(c) -> Lambda K-S(0) K+ is measured to be (3.12 +/- 0.46 +/- 0.15) x 10(-3). Combined with a previous measurement from the BESIII Collaboration, the branching fraction of the decay Lambda(+)(c) -> Lambda K-S(0) K+ is calculated to be (3.07 +/- 0.26 +/- 0.13) x 10(-3). The decay Lambda(+)(c) -> Xi K-0(S)0 pi(+) is observed for the first time with a statistical significance of 6.6 sigma, and its branching fraction is determined to be (3.70 +/- 0.60 +/- 0.21) x 10(-3). In addition, a search for the decay Lambda(+)(c) -> Sigma K-0(S)0 K+ is performed, and its branching fraction is determined to be (0.80(-0.24)(+0.28) +/- 0.16) x 10(-3), corresponding to an upper limit of 1.28 x 10(-3) at a 90% confidence level. These measurements provide new information that can be used to distinguish between theoretical models.LPHE-L
Measurement of cross sections of the interactions e(+)e(-) -> phi phi omega and e(+)e(-) -> phi phi phi at center-of-mass energies from 4.008 to 4.600 GeV
No full textKolcu, Onur Buğra (Arel Author)Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes e(+)e(-) -> phi phi omega and e(-)e(-) -> phi phi phi. The Born cross sections are measured and the ratio of the cross sections sigma(e(+)e(-) -> phi phi omega)/sigma(e(-)e(-) -> phi phi phi) is estimated to be 1.75 +/- 0.22 +/- 0.19 averaged over six energy points, where the first uncertainty is statistical and the second is systematic. The results represent first measurements of these interactions. (c) 2017 The Author(s). Published by Elsevier B.V
Dark photon search in the mass range between 1.5 and 3.4 GeV/c
No full textKolcu, Onur Buğra (Arel Author)Using a data set of 2.93 fb taken at a center-of-mass energy root s = 3.773 GeV with the BESIII detector at the BEPCII collider, we perform a search for an extra U(1) gauge boson, also denoted as a dark photon. We examine the initial state radiation reactions e(+)e(-) -> e(+)e(-) gamma(ISR) and e(+)e(-) -> mu(+)mu(-) gamma(ISR) for this search, where the dark photon would appear as an enhancement in the invariant mass distribution of the leptonic pairs. We observe no obvious enhancement in the mass range between 1.5 and 3.4 GeV/c(2) and set a 90% confidence level upper limit on the mixing strength of the dark photon and the Standard Model photon. We obtain a competitive limit in the tested mass range. (c) 2017 The Author(s). Published by Elsevier B.V
Search for the rare decay D+ -> D(0)e(+)nu(e)
No full textKolcu, Onur Buğra (Arel Author)Using a data set with an integrated luminosity of 2.93 fb(-1) collected at root s = 3.773 GeV with the BESIII detector operating at the BEPCII storage rings, we search for the rare decay D+ -> D(0)e(+)nu(e). No signal events are observed. We set the upper limit on the branching fraction for D+ -> D(0)e(+)nu(e) to be 1.0 x 10(-4) at the 90% confidence level
Search for the decay D-s(+) -> gamma e (+) nu(e)
No full textKolcu, Onur Buğra (Arel Author)A search for the rare radiative leptonic decay D-s(+) -> gamma e(+)nu(e) is performed for the first time using electron-positron collision data corresponding to an integrated luminosity of 3.19 fb(-1), collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. No evidence for the D-s(+) -> gamma e(+)nu(e) decay is seen, and an upper limit of beta(D-s(+) -> gamma e(+)nu(e)) 0.01 GeV
Amplitude analysis and branching fraction measurement of D-0 -> K-pi(+)pi(0)pi(0)
No full textKolcu, Onur Buğra (Arel Author)Utilizing the dataset corresponding to an integrated luminosity of 2.93 fb(-1) at root s = 3.773 GeV collected by the BESIII detector, we report the first amplitude analysis and branching fraction measurement of the D-0 -> K- pi(+)pi(0)pi(0) decay. We investigate the substructures and determine the relative fractions and the phases among the different intermediate processes. Our results are used to provide an accurate detection efficiency and allow measurement of B(D-0 -> K- pi(+)pi(0)pi(0)) = (8.86 +/- 0.13(stat) +/- 0.19(syst))%
Luminosity measurements for the R scan experiment at BESIII
No full textKolcu, Onur Buğra (Arel Author)By analyzing the large-angle Bhabha scattering events e(+)e(-) -> (gamma)e(+)e(-) and diphoton events e(+)e(-) -> (gamma)gamma gamma for the data sets collected at center-of-mass (c.m.) energies between 2.2324 and 4.5900 GeV (131 energy points in total) with the upgraded Beijing Spectrometer (BESIII) at the Beijing Electron-Positron Collider (BEPCII), the integrated luminosities have been measured at the different c.m. energies, individually. The results are important inputs for the R value and J/Psi resonance parameter measurements
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