First observation of the decay B_s2^*(5840)^0 → B^*+ K^- and
studies of excited B_s mesons
release_hw5rasz25rer3cnzcabcfj6o4m
by
LHCb collaboration: 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. Alkhazov, P. Alvarez Cartelle (+586 others)
2012
Abstract
Properties of the orbitally excited (L=1) B_s states are studied using 1.0
fb^-1 of pp collisions at √(s) =7 TeV collected with the LHCb
detector. The first observation of the B_s2^*(5840)^0 meson decaying to
B^*+ K^- is reported, and the corresponding branching fraction measured
relative to the B^+ K^- decay mode. The B_s1(5830)^0 → B^*+ K^- decay
is observed as well. The width of the B_s2^*(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 B_s2^*(5840)^0 → B^*+ K^-
decay favours the spin-parity assignment J^P = 2^+ for the B_s2^*(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/c^2 is
obtained.
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