The properties of the orbitally excited (L=1) B0s states are studied by using 1.0 fb^−1 of pp collisions at √s = 7 TeV collected with the LHCb detector. The first observation of the Bs2*(5840)0 meson decaying to B*+ K− is reported, and the corresponding branching fraction measured relative to the B+ K− decay mode. The Bs1(5830)0 → B*+ K− decay is observed as well. The width of the Bs2*(5840)0 state is measured for the first time, and the masses of the two states are determined with the highest precision to date. The observation of the Bs2*(5840)0 → B*+ K− decay favors the spin-parity assignment JP=2+ for the Bs2*(5840)0 meson. In addition, the most precise measurement of the mass difference m(B*+)−m(B+) = 45.01 ± 0.30(stat) ± 0.23(syst) MeV/c2 is obtained.

R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, et al. (2013). First Observation of the Decay Bs2*(5840)0 → B*+ K− and Studies of Excited B0s Mesons. PHYSICAL REVIEW LETTERS, 110(15), 1-9 [10.1103/PhysRevLett.110.151803].

First Observation of the Decay Bs2*(5840)0 → B*+ K− and Studies of Excited B0s Mesons

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2013

Abstract

The properties of the orbitally excited (L=1) B0s states are studied by using 1.0 fb^−1 of pp collisions at √s = 7 TeV collected with the LHCb detector. The first observation of the Bs2*(5840)0 meson decaying to B*+ K− is reported, and the corresponding branching fraction measured relative to the B+ K− decay mode. The Bs1(5830)0 → B*+ K− decay is observed as well. The width of the Bs2*(5840)0 state is measured for the first time, and the masses of the two states are determined with the highest precision to date. The observation of the Bs2*(5840)0 → B*+ K− decay favors the spin-parity assignment JP=2+ for the Bs2*(5840)0 meson. In addition, the most precise measurement of the mass difference m(B*+)−m(B+) = 45.01 ± 0.30(stat) ± 0.23(syst) MeV/c2 is obtained.
2013
R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, et al. (2013). First Observation of the Decay Bs2*(5840)0 → B*+ K− and Studies of Excited B0s Mesons. PHYSICAL REVIEW LETTERS, 110(15), 1-9 [10.1103/PhysRevLett.110.151803].
R. Aaij; C. Abellan Beteta; A. Adametz; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/134666
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