Observation of the semileptonic decay B+→ ppˉ μ+νμ

Aaij R.; Abellán Beteta C.; Ackernley T.; Adeva B.; Adinolfi M.; Afsharnia H.; Aidala C.A.; Aiola S.; Ajaltouni Z.; Akar S.; Albicocco P.; Albrecht J.; Alessio F.; Alexander M.; Alfonso Albero A.; Alkhazov G.; Alvarez Cartelle P.; Alves A.A.; Jr, Amato S.; Amhis Y.; An L.; Anderlini L.; Andreassi G.; Andreotti M.; Archilli F.; Arnau Romeu J.; Artamonov A.; Artuso M.; Arzymatov K.; Aslanides E.; Atzeni M.; Audurier B.; Bachmann S.; Back J.J.; Baker S.; Balagura V.; Baldini W.; Baranov A.

INSPECAHCICHINAJOURNALWAJCISCOPUSSCIE

University of Michigan-Ann Arbor; 常州工学院; 华中师范大学; University of Michigan Ann Arbor; Los Alamos National Laboratory; The University of Maryland; Imperial College london; Polish Academy of Sciences; 陕西师范大学; RWTH Aachen University; University of Michigan, Ann Arbor; Rutherford Appleton Laboratory; University of Maryland; 北京大学; Polytechnic university; The University of Bristol; 中国科学院大学; Russian Academy of Sciences; University of Michigan,Ann Arbor; The University of Liverpool; University College Dublin; University of LIVERPOOL; Los Alamos; University of Groningen; Scuola Normale Superiore; Russian Academy of Science; 华南师范大学; 核物理与核技术国家重点实验室; University of bristol

摘要

The Cabibbo-suppressed semileptonic decay B+→ ppˉ μ+νμ is observed for the first time using a sample of pp collisions corresponding to an integrated luminosity of 1.0, 2.0 and 1.7 fb?1 at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The differential branching fraction is measured as a function of the ppˉ invariant mass using the decay mode B+→ J/ψK+ for normalisation. The total branching fraction is measured to be ?(B+→ppˉμ+νμ)=(5.27?0.24+0.23±0.21±0.15)×10?6, where the first uncertainty is statistical, the second systematic and the third is from the uncertainty on the branching fraction of the normalisation channel. [Figure not available: see fulltext.]

关键词

B physics Branching fraction Flavor physics Hadron-Hadron scattering (experiments)