https://scholars.lib.ntu.edu.tw/handle/123456789/573658
標題: | Measurement of Bc (2S)+ and Bc? (2S)+ cross section ratios in proton-proton collisions at s =13 TeV | 作者: | KAI-FENG CHEN WEI-SHU HOU |
公開日期: | 2020 | 卷: | 102 | 期: | 9 | 來源出版物: | Physical Review D | 摘要: | The ratios of the Bc(2S)+ to Bc+, Bc?(2S)+ to Bc+, and Bc?(2S)+ to Bc(2S)+ production cross sections are measured in proton-proton collisions at s=13 TeV, using a data sample collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 143 fb-1. The three measurements are made in the Bc+ meson phase space region defined by the transverse momentum pT>15 GeV and absolute rapidity |y|<2.4, with the excited Bc(?)(2S)+ states reconstructed through the Bc(?)+π+π-, followed by the Bc+→J/ψπ+ and J/ψ→μ+μ- decays. The Bc(2S)+ to Bc+, Bc?(2S)+ to Bc+, and Bc?(2S)+ to Bc(2S)+ cross section ratios, including the unknown Bc(?)(2S)+→Bc(?)+π+π- branching fractions, are (3.47±0.63(stat)±0.33(syst))%, (4.69±0.71(stat)±0.56(syst))%, and 1.35±0.32(stat)±0.09(syst), respectively. None of these ratios shows a significant dependence on the pT or |y| of the Bc+ meson. The normalized dipion invariant mass distributions from the decays Bc(?)(2S)+→Bc(?)+π+π- are also reported. ? 2020 CERN. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85097205855&doi=10.1103%2fPhysRevD.102.092007&partnerID=40&md5=eadf625d122dd09131867ebf805ab662 https://scholars.lib.ntu.edu.tw/handle/123456789/573658 |
ISSN: | 24700010 | DOI: | 10.1103/PhysRevD.102.092007 |
顯示於: | 物理學系 |
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