The first observation of the B0s → (χc1(3872) → J/ψ π+ π−) π+ π− decay is reported using proton-proton collision data, corresponding to integrated luminosities of 1, 2 and 6 fb^−1, collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ratio of branching fractions relative to the B0s → (ψ(2S) → J/ψ π+ π−) π+ π− decay is measured to be {B(B0s → χc1(3872) π+ π−) × B(χc1(3872) → J/ψ π+ π−)} / {B(B0s → ψ(2S) π+ π−) × B(ψ(2S) → J/ψ π+ π−)} = (6.8 ± 1.1 ± 0.2) × 10^−2, where the first uncertainty is statistical and the second systematic. The mass spectrum of the π+ π− system recoiling against the χc1(3872) meson exhibits a large contribution from B0s → χc1(3872) (f0(980) → π+ π−) decays.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation of the B0s → χc1(3872) π+ π− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2023(7), 0-24 [10.1007/jhep07(2023)084].

Observation of the B0s → χc1(3872) π+ π− Decay

Carbone, A.;Ferrari, F.;Galli, D.;Manuzzi, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zucchelli, S.;
2023

Abstract

The first observation of the B0s → (χc1(3872) → J/ψ π+ π−) π+ π− decay is reported using proton-proton collision data, corresponding to integrated luminosities of 1, 2 and 6 fb^−1, collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ratio of branching fractions relative to the B0s → (ψ(2S) → J/ψ π+ π−) π+ π− decay is measured to be {B(B0s → χc1(3872) π+ π−) × B(χc1(3872) → J/ψ π+ π−)} / {B(B0s → ψ(2S) π+ π−) × B(ψ(2S) → J/ψ π+ π−)} = (6.8 ± 1.1 ± 0.2) × 10^−2, where the first uncertainty is statistical and the second systematic. The mass spectrum of the π+ π− system recoiling against the χc1(3872) meson exhibits a large contribution from B0s → χc1(3872) (f0(980) → π+ π−) decays.
2023
Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Observation of the B0s → χc1(3872) π+ π− Decay. JOURNAL OF HIGH ENERGY PHYSICS, 2023(7), 0-24 [10.1007/jhep07(2023)084].
Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/952109
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