Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.072001
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Funding
- CERN
- national agency CAPES (Brazil)
- national agency CNPq (Brazil)
- NSFC (China)
- CNRS/IN2P3 (France)
- BMBF (Germany)
- DFG (Germany)
- HGF (Germany)
- MPG (Germany)
- INFN (Italy)
- FOM (The Netherlands)
- NWO (The Netherlands)
- MNiSW (Poland)
- NCN (Poland)
- MEN/IFA (Romania)
- MinES (Russia)
- FANO (Russia)
- MinECo (Spain)
- SNSF (Switzerland)
- SER (Switzerland)
- NASU (Ukraine)
- STFC (U.K.)
- NSF (U.S.)
- IN2P3 (France)
- KIT (Germany)
- SURF (The Netherlands)
- PIC (Spain)
- GridPP (United Kingdom)
- EPLANET (European Union)
- Marie Sklodowska-Curie Actions (European Union)
- ERC (European Union)
- Conseil general de Haute-Savoie (France)
- Labex ENIGMASS (France)
- OCEVU (France)
- Region Auvergne (France)
- RFBR (Russia)
- XuntaGal (Spain)
- Royal Society (United Kingdom)
- Royal Commission for the Exhibition of 1851 (United Kingdom)
- GENCAT (Spain)
- national agency FAPERJ (Brazil)
- national agency FINEP (Brazil)
- Direct For Mathematical & Physical Scien
- Division Of Physics [1205805] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1505719] Funding Source: National Science Foundation
- STFC [PP/E000355/1, ST/J004855/1, ST/I003576/1, ST/L001195/1, ST/M004791/1, ST/H006737/1, ST/M000729/1, ST/K000705/1, ST/M001407/1, ST/L003538/1, ST/K00140X/1, ST/J50094X/1, ST/J005495/1, ST/K001302/1, ST/K003534/1, ST/L00352X/1, ST/L006146/1, ST/M000761/1, ST/I000097/1, ST/M004058/1, ST/L003112/1, ST/L003163/1, PP/E003095/1, ST/H00100X/1, ST/H00100X/2, ST/K001604/1, ST/K00137X/1, ST/K004646/1, ST/K003410/1, ST/J004332/1, ST/N000447/1, LHCb, ST/L003392/1, LHCb Upgrades] Funding Source: UKRI
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Observations of exotic structures in the J/psi p channel, which we refer to as charmonium-pentaquark states, in Lambda(0)(b) --> J/psi K(-)p decays are presented. The data sample corresponds to an integrated luminosity of 3 fb(-1) acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis of the three-body final state reproduces the two-body mass and angular distributions. To obtain a satisfactory fit of the structures seen in the J/psi p mass spectrum, it is necessary to include two Breit-Wigner amplitudes that each describe a resonant state. The significance of each of these resonances is more than 9 standard deviations. One has a mass of 4380 +/- 8 +/- 29 MeV and a width of 205 +/- 18 +/- 86 MeV, while the second is narrower, with a mass of 4449.8 +/- 1.7 +/- 2.5 MeV and a width of 39 +/- 5 +/- 19 MeV. The preferred J(P) assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
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