Observation of new excited Bs0 states
Authors
Aaij, R
Beteta, CA
Ackernley, T
Adeva, B
Adinolfi, M
Afsharnia, H
Aidala, CA
Aiola, S
Ajaltouni, Z
Akar, S
Albrecht, J
Alessio, F
Alexander, M
Albero, AA
Aliouche, Z
Alkhazov, G
Cartelle, PA
Amato, S
Amhis, Y
An, L
Anderlini, L
Andreianov, A
Andreotti, M
Archilli, F
Artamonov, A
Artuso, M
Arzymatov, K
Aslanides, E
Atzeni, M
Audurier, B
Bachmann, S
Bachmayer, M
Back, JJ
Baker, S
Rodriguez, PB
Balagura, V
Baldini, W
Leite, JB
Barlow, RJ
Barsuk, S
Barter, W
Bartolini, M
Baryshnikov, F
Basels, JM
Bassi, G
Batsukh, B
Battig, A
Bay, A
Becker, M
Bedeschi, F
Bediaga, I
Beiter, A
Belavin, V
Belin, S
Bellee, V
Belous, K
Belov, I
Belyaev, I
Bencivenni, G
Ben-Haim, E
Berezhnoy, A
Bernet, R
Berninghoff, D
Bernstein, HC
Bertella, C
Bertholet, E
Bertolin, A
Betancourt, C
Betti, F
Bettler, MO
Bezshyiko, I
Bhasin, S
Bhom, J
Bian, L
Bieker, MS
Bifani, S
Billoir, P
Birch, M
Bishop, FCR
Bizzeti, A
Bjørn, M
Blago, MP
Blake, T
Blanc, F
Blusk, S
Bobulska, D
Boelhauve, JA
Garcia, OB
Boettcher, T
Boldyrev, A
Bondar, A
Bondar, N
Borghi, S
Borisyak, M
Borsato, M
Borsuk, JT
Bouchiba, SA
Bowcock, TJV
Boyer, A
Bozzi, C
Publication Date
2021-07Journal Title
European Physical Journal C
ISSN
1434-6044
Publisher
Springer Science and Business Media LLC
Volume
81
Issue
7
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Aaij, R., Beteta, C., Ackernley, T., Adeva, B., Adinolfi, M., Afsharnia, H., Aidala, C., et al. (2021). Observation of new excited Bs0 states. European Physical Journal C, 81 (7) https://doi.org/10.1140/epjc/s10052-021-09305-3
Abstract
A structure is observed in the $B^+K^-$ mass spectrum in a sample of
proton--proton collisions at centre-of-mass energies of 7, 8, and 13 TeV,
collected with the LHCb detector and corresponding to a total integrated
luminosity of 9 fb${}^-1$. The structure is interpreted as the result of
overlapping excited $B_s^0$ states. With high significance, a two-peak
hypothesis provides a better description of the data than a single resonance.
Under this hypothesis the masses and widths of the two states, assuming they
decay directly to $B^+K^-$, are determined to be
$m_1 = 6063.5 \pm 1.2 \text{ (stat)} \pm 0.8\text{ (syst) MeV},$
$\Gamma_1 = 26 \pm 4 \text{ (stat)} \pm 4\text{ (syst) MeV},$
$m_2 = 6114 \pm 3 \text{ (stat)} \pm 5\text{ (syst) MeV},$
$\Gamma_2 = 66 \pm 18 \text{ (stat)} \pm 21\text{ (syst) MeV}.$
Alternative values assuming a decay through $B^{*+}K^-$, with a missing
photon from the $B^{*+} \rightarrow B^+\gamma$ decay, which are shifted by
approximately 45 MeV are also determined. The possibility of a single state
decaying in both channels is also considered. The ratio of the total production
cross-section times branching fraction of the new states relative to the
previously observed $B_{s2}^{*0}$ state is determined to be $0.87 \pm 0.15
\text{ (stat)} \pm 0.19 \text{ (syst)}$.
Keywords
Regular Article - Experimental Physics
Identifiers
s10052-021-09305-3, 9305
External DOI: https://doi.org/10.1140/epjc/s10052-021-09305-3
This record's URL: https://www.repository.cam.ac.uk/handle/1810/328640
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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