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.

Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Observation of B(s)0 →j/ψp p Decays and Precision Measurements of the B(s)0 Masses. PHYSICAL REVIEW LETTERS, 122(19), 191804 [10.1103/PhysRevLett.122.191804].

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

Belloli N.;Borsato M.;Calvi M.;Carniti P.;Fazzini D.;Gotti C.;Martinelli M.;Petruzzo M.;
2019

Abstract

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.
Articolo in rivista - Articolo scientifico
B(s)0; precision mass measurement
English
2019
122
19
191804
191804
none
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Observation of B(s)0 →j/ψp p Decays and Precision Measurements of the B(s)0 Masses. PHYSICAL REVIEW LETTERS, 122(19), 191804 [10.1103/PhysRevLett.122.191804].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/242929
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