TY - JOUR
T1 - Observation of J/ψp Resonances Consistent with Pentaquark States in Λ0b→J/ψK−p Decays
AU - LHCb collaboration
AU - Adeva, Bernardo
AU - Adinolfi, Marco
AU - Affolder, Anthony
AU - Ajaltouni, Ziad
AU - Akar, Simon
AU - Albrecht, Johannes
AU - Alessio, Federico
AU - Alexander, Michael
AU - Ali, Suvayu
AU - Alkhazov, Georgy
AU - Alvarez Cartelle, Paula
AU - Alves Jr, Antonio Au
AU - Amato, Sandra
AU - Amerio, Silvia
AU - Amhis, Yasmine
AU - An, Liupan
AU - Anderlini, Lucio
AU - Anderson, Jonathan
AU - Andreassi, Guido
AU - Andreotti, Mirco
AU - Andrews, Jason
AU - Appleby, Robert
AU - Aquines Gutierrez, Osvaldo
AU - Archilli, Flavio
AU - d'Argent, Philippe
AU - Artamonov, Alexander
AU - Artuso, Marina
AU - Aslanides, Elie
AU - Auriemma, Giulio
AU - Baalouch, Marouen
AU - Bachmann, Sebastian
AU - Back, John
AU - Badalov, Alexey
AU - Baesso, Clarissa
AU - Baldini, Wander
AU - Barlow, Roger
AU - Barschel, Colin
AU - Barsuk, Sergey
AU - Barter, William
AU - Batozskaya, Varvara
AU - Battista, Vincenzo
AU - Bay, Aurelio
AU - Beaucourt, Leo
AU - Clarke, P E L
AU - Cowan, G A
AU - Eisenhardt, S
AU - Muheim, F
AU - Needham, M
AU - Pappagallo, Marco
AU - Playfer, S
PY - 2015/8/14
Y1 - 2015/8/14
N2 - Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ0b→J/ψK−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/ψp 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 JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
AB - Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ0b→J/ψK−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/ψp 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 JP assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
U2 - 10.1103/PhysRevLett.115.072001
DO - 10.1103/PhysRevLett.115.072001
M3 - Article
VL - 115
SP - 1
EP - 15
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
M1 - 072001
ER -
