The first observation of the decays B0(s) → J/ψ p anti-p 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/ψ p anti-p) = [4.51 ± 0.40(stat) ± 0.44(syst)] × 10^−7, B(B0s → J/ψ p anti-p) = [3.58 ± 0.19(stat) ± 0.39(syst)] × 10^−6. For the B0s 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 B0s mass as 5366.85 ± 0.19(stat) ± 0.13(syst) MeV.

Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Observation of B0(s) → J/ψ p anti-p Decays and Precision Measurements of the B0(s) Masses. PHYSICAL REVIEW LETTERS, 122(19), 1-10 [10.1103/PhysRevLett.122.191804].

Observation of B0(s) → J/ψ p anti-p Decays and Precision Measurements of the B0(s) Masses

Betti, F.;Capriotti, L.;Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Perazzini, S.;Pisani, F.;Vagnoni, V.;Zucchelli, S.
2019

Abstract

The first observation of the decays B0(s) → J/ψ p anti-p 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/ψ p anti-p) = [4.51 ± 0.40(stat) ± 0.44(syst)] × 10^−7, B(B0s → J/ψ p anti-p) = [3.58 ± 0.19(stat) ± 0.39(syst)] × 10^−6. For the B0s 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 B0s mass as 5366.85 ± 0.19(stat) ± 0.13(syst) MeV.
2019
Aaij, R., Abellán Beteta, C., Adeva, B., Adinolfi, M., Aidala, C., Ajaltouni, Z., et al. (2019). Observation of B0(s) → J/ψ p anti-p Decays and Precision Measurements of the B0(s) Masses. PHYSICAL REVIEW LETTERS, 122(19), 1-10 [10.1103/PhysRevLett.122.191804].
Aaij, R.; Abellán Beteta, C.; Adeva, B.; Adinolfi, M.; Aidala, C.A.; Ajaltouni, Z.; Akar, S.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.;...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/688251
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