Precise measurements of branching fractions for D s + $$ {\mathrm{D}}_{\mathrm{s}}^{+} $$ meson decays to two pseudosc
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Springer
Received: May 12, Revised: July 6, Accepted: July 24, Published: August 28,
2020 2020 2020 2020
The BESIII collaboration E-mail: [email protected], [email protected] Abstract: We measure the branching fractions for seven Ds+ two-body decays to pseudo√ scalar mesons, by analyzing data collected at s = 4.178 ∼ 4.226 GeV with the BESIII detector at the BEPCII collider. The branching fractions are determined to be B(Ds+ → K + η 0 ) = (2.68 ± 0.17 ± 0.17 ± 0.08) × 10−3 , B(Ds+ → η 0 π + ) = (37.8 ± 0.4 ± 2.1 ± 1.2) × 10−3 , B(Ds+ → K + η) = (1.62 ± 0.10 ± 0.03 ± 0.05) × 10−3 , B(Ds+ → ηπ + ) = (17.41 ± 0.18 ± 0.27 ± 0.54) × 10−3 , B(Ds+ → K + KS0 ) = (15.02 ± 0.10 ± 0.27 ± 0.47) × 10−3 , B(Ds+ → KS0 π + ) = (1.109 ± 0.034 ± 0.023 ± 0.035) × 10−3 , B(Ds+ → K + π 0 ) = (0.748 ± 0.049 ± 0.018 ± 0.023) × 10−3 , where the first uncertainties are statistical, the second are systematic, and the third are from external input branching fraction of the normalization mode Ds+ → K + K − π + . Precision of our measurements is significantly improved compared with that of the current world average values. Keywords: Branching fraction, Charm physics, e+ -e− Experiments ArXiv ePrint: 2005.05072
c The Authors. Open Access, Article funded by SCOAP3 .
https://doi.org/10.1007/JHEP08(2020)146
JHEP08(2020)146
Precise measurements of branching fractions for D+ s meson decays to two pseudoscalar mesons
Contents 1
2 BESIII detector and Monte Carlo simulation
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3 Measurement method
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4 Event selection
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5 Signal yield and branching fraction
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6 Systematic uncertainty
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7 Summary and discussion
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The BESIII collaboration
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1
Introduction
Among the hadronic decays of the strange-charmed meson Ds+ , the theoretical treatment based on QCD-inspired models of its decays into two pseudoscalar mesons (Ds+ → PP 0 ) is the cleanest [1, 2]. Precision measurements of these decay rates can provide crucial calibrations to different theoretical models [1–5]. For each decay branching fraction (BF) listed in table 1, the precision of current measurements listed by the Particle Data Group (PDG) [6] is still not good enough to test theoretical models. Hence, more precise and independent measurements are desired to further improve our understanding of QCD dynamics in charm physics. In 2019, LHCb discovered CP violation in D0 → π + π − and D0 → K + K − decays with a significance of 5.3σ [7], providing stringent constraints on theoretical approaches to CP violation in the charm sector [1, 4, 8]. For the strange-charmed meson Ds+ , there are theoretical predictions for the CP asymmetries of the singly Cabibbo-suppressed (SCS) decay modes, which rely on the potential effect of SU(3) symmetry breaking [3, 9]. However, the current world average results, as shown in table 1, suffer from large uncertainties and are thus insensitive to SU(3) breaking. More precise measurements of the BFs for the SCS modes in Ds+ → PP 0 will help to explore SU(3) symmetry breaking in Ds+ decays [3, 9]. As a result, more reliable theoretic
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