First Observation of the Decay B_{s2}^{*}(5840)^{0}→B^{*+}K^{-} and Studies of Excited B_{s}^{0} Mesons
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Aaij-2013-First Observation of the Decay.pdf
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Author(s)
Williams, Michael
Alternative Title
First Observation of the Decay Bs2*(5840)0→B*+K- and Studies of Excited Bs0 Mesons
Date Issued
April 2013
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al. “First Observation of the Decay B_{s2}^{*}(5840)^{0}→B^{*+}K^{-} and Studies of Excited B_{s}^{0} Mesons.” Physical Review Letters 110, no. 15 (April 2013).
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Final published version
Abstract
The properties of the orbitally excited (L=1) Bs[superscript 0] 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 B[subscript s2][superscript *](5840)[superscript 0] meson decaying to B[superscript *+]K- is reported, and the corresponding branching fraction measured relative to the B+K- decay mode. The B[subscript s1](5830)[superscript 0]-->B[superscript *+]K- decay is observed as well. The width of the B[subscript s2][superscript *](5840)[superscript 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[subscript s2][superscript *](5840)[superscript 0]-->B[superscript *+]K- decay favors the spin-parity assignment J[superscript P]=2+ for the B[subscript s2][superscript *](5840)[superscript 0] meson. In addition, the most precise measurement of the mass difference m(B[superscript *+])-m(B+)=45.01±0.30(stat)±0.23(syst) MeV/c[superscript 2] is obtained.
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 3.0
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.110.151803
