期刊
EUROPEAN PHYSICAL JOURNAL C
卷 81, 期 7, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-021-09305-3
关键词
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资金
- CERN
- CAPES, (Brazil)
- CNPq, (Brazil)
- FAPERJ, (Brazil)
- FINEP, (Brazil)
- MOST (China)
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF (Germany)
- DFG (Germany)
- MPG (Germany)
- INFN (Italy)
- NWO (Netherlands)
- MNiSW (Poland)
- NCN (Poland)
- MEN/IFA (Romania)
- MSHE (Russia)
- MICINN (Spain)
- SNSF (Switzerland)
- SER (Switzerland)
- NASU (Ukraine)
- STFC (United Kingdom)
- DOE NP (USA)
- NSF (USA)
- AvH Foundation (Germany)
- EPLANET (European Union)
- Marie Skodowska-Curie Actions and ERC (European Union)
- A*MIDEX (France)
- ANR (France)
- Labex P2IO and OCEVU (France)
- Region Auvergne-Rhone-Alpes (France)
- Key Research Program of Frontier Sciences of CAS (China)
- CAS PIFI (China)
- Thousand Talents Program (China)
- Sci. & Tech. Program of Guangzhou (China)
- RFBR (Russia)
- RSF (Russia)
- Yandex LLC (Russia)
- GVA (Spain)
- XuntaGal (Spain)
- GENCAT (Spain)
- Royal Society (United Kingdom)
- Leverhulme Trust (United Kingdom)
- Science and Technology Facilities Council [ST/S000879/1] Funding Source: researchfish
A structure observed in the B +/- K -/+ mass spectrum from proton-proton collisions is interpreted as overlapping excited Bs0 states. A two-peak hypothesis better describes the data than a single resonance, and the ratio of the new states' production cross-section times branching fraction relative to the previously observed Bs20 state is determined to be 0.87 +/- 0.15(stat)+/- 0.19(syst).
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 9fb-1. The structure is interpreted as the result of overlapping excited Bs0 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 m1=6063.5 +/- 1.2(stat)+/- 0.8(syst)Me,Gamma 1=26 +/- 4(stat)+/- 4(syst)Me,m2=6114 +/- 3(stat)+/- 5(syst)Me,Gamma 2=66 +/- 18(stat)+/- 21(syst)Me.Alternative values assuming a decay through B +/- K -/+, with a missing photon from the B +/- -> B +/- gamma decay, which are shifted by approximately 45MeV, 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 Bs20 state is determined to be 0.87 +/- 0.15(stat)+/- 0.19(syst).
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