期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.072002
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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 (The Netherlands)
- MNiSW (Poland)
- NCN (Poland)
- MEN/IFA (Romania)
- MinES (Russia)
- FASO (Russia)
- Generalitat Valenciana (Spain)
- MinECo (Spain)
- SNSF (Switzerland)
- SER (Switzerland)
- NASU (Ukraine)
- STFC (United Kingdom)
- NSF (USA)
- AvH Foundation (Germany)
- EPLANET (European Union)
- Marie Sklodowska-Curie Actions (European Union)
- ERC (European Union)
- ANR
- Labex P2IO
- OCEVU
- Region Auvergne-Rhone-Alpes (France)
- Key Research Program of Frontier Sciences of CAS (China)
- CAS PIFI (China)
- Thousand Talents Program (China)
- RFBR (Russia)
- RSF (Russia)
- Yandex LLC (Russia)
- GVA (Spain)
- GENCAT (Spain)
- Herchel Smith Fund (United Kingdom)
- Royal Society (United Kingdom)
- English-Speaking Union (United Kingdom)
- Leverhulme Trust (United Kingdom)
- XuntaGal (Spain)
- STFC [ST/N000455/1, 1796908, ST/N000463/1, 1708182, ST/N000234/1, ST/N000242/1, LHCb Upgrades, ST/L003163/1, LHCb, ST/N000447/1, ST/J004332/1, ST/K003410/1] Funding Source: UKRI
From samples of pp collision data collected by the LHCb experiment at root s = 7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5 fb(-1), respectively, a peak in both the Lambda(0)(b) K- and Xi(0)(b)pi(-) invariant mass spectra is observed. In the quark model, radially and orbitally excited Xi(-)(b) resonances with quark content bds are expected. Referring to this peak as Xi(b)(6227)(-), the mass and natural width are measured to be m(Xi b(6227))(-) = 6226.9 +/- 2.0 +/- 0.3 +/- 0.2 MeV/c(2) and Gamma(Xi b(6227))- = 18.1 +/- 5.4 +/- 1.8 MeV/c(2), where the first uncertainty is statistical, the second is systematic, and the third, on m(Xi b(6227))(-), is due to the knowledge of the Lambda(0)(b) baryon mass. Relative production rates of the Xi(b)(6227)(-) -> Lambda K-0(b)- and Xi(b)(6227)(-) -> Xi(0)(b)pi(-) decays are also reported.
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