Observation of the B+ c → J/ψπ+π 0 decay

Brundu, D.;Contu, A.;De Angelis, C.;Dettori, F.;Dordei, F.;Fabiano, F.;Litvinov, R.;Manca, G.;Oldeman, R.;Saitta, B.;Sun, J.;
2024-01-01

Abstract

The frst observation of the B+ c → J/ψπ+π 0 decay is reported with high signifcance using proton-proton collision data, corresponding to an integrated luminosity of 9 fb−1 , collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13 TeV. The ratio of its branching fraction relative to the B+ c → J/ψπ+ channel is measured to be BB + c →J/ψπ+π0 BB + c →J/ψπ+ = 2.80 ± 0.15 ± 0.11 ± 0.16 , where the frst uncertainty is statistical, the second systematic and the third related to imprecise knowledge of the branching fractions for B+ → J/ψK∗+ and B+ c → J/ψπ+ decays, which are used to determine the π 0 detection efciency. The π +π 0 mass spectrum is found to be consistent with the dominance of an intermediate ρ + contribution in accordance with a model based on QCD factorisation.
2024
Inglese
2024
4
151
https://link.springer.com/article/10.1007/JHEP04(2024)151
Esperti anonimi
scientifica
B Physics, Hadron-Hadron Scattering, QCD, Spectroscopy
Null, Null; Aaij, R.; Abdelmotteleb, A. S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adams, J. A.; Adefisoye, A. A.; Adeva, B.; Adinolfi, M ...espandi
1.1 Articolo in rivista
info:eu-repo/semantics/article
1 Contributo su Rivista::1.1 Articolo in rivista
262
1089
open
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