Observation of B (s)0 →j/ψp p Decays and Precision Measurements of the B (s)0 Masses

LHCb Collaboration, Alexander Rudolfovich Wagner

Результат исследований: Материалы для журналаСтатья

3 Цитирования (Scopus)

Аннотация

The first observation of the decays B(s)0→J/ψpp is reported, using proton-proton collision data corresponding to an integrated luminosity of 5.2 fb-1, collected with the LHCb detector. These decays are suppressed due to limited available phase space, as well as due to Okubo-Zweig-Iizuka or Cabibbo suppression. The measured branching fractions are B(B0→J/ψpp)=[4.51±0.40(stat)±0.44(syst)]×10-7, B(Bs0→J/ψpp)=[3.58±0.19(stat)±0.39(syst)]×10-6. For the Bs0 meson, the result is much higher than the expected value of O(10-9). The small available phase space in these decays also allows for the most precise single measurement of both the B0 mass as 5279.74±0.30(stat)±0.10(syst) MeV and the Bs0 mass as 5366.85±0.19(stat)±0.13(syst) MeV.

Язык оригиналаАнглийский
Номер статьи191804
ЖурналPhysical Review Letters
Том122
Номер выпуска19
DOI
СостояниеОпубликовано - 17 мая 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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