The first observation of the → (χc1(3872) → J/ψπ+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 → (ψ(2S) → J/ψπ+π−)π+π− decay is measured to be [GRAPHICS] 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 → χc1(3872) (f0(980) → π+π−) decays.
Observation of the Bs0 → χc1(3872)π+π− decay / R. Aaij, A.S.W.A.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2023:7(2023 Jul 11), pp. 84.1-84.25. [10.1007/JHEP07(2023)084]
Observation of the Bs0 → χc1(3872)π+π− decay
C. Mancuso;D. Marangotto;A. Merli;N. Neri;E. Spadaro Norella;G. Tonani;
2023
Abstract
The first observation of the → (χc1(3872) → J/ψπ+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 → (ψ(2S) → J/ψπ+π−)π+π− decay is measured to be [GRAPHICS] 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 → χc1(3872) (f0(980) → π+π−) decays.| File | Dimensione | Formato | |
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