Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛp¯ decays

LHCb Collaboration; Nigel Watson; Simone Bifani; Niladribihari Sahoo; Paul Swallow; Naomi Cooke; Ryan Calladine; Jonathan Plews; Mark Slater; Antonino Sergi; Dmitry Popov; Philip Ilten

doi:10.1103/PhysRevLett.131.031901

Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛp¯ decays

LHCb Collaboration, Nigel Watson, Simone Bifani, Niladribihari Sahoo, Paul Swallow, Naomi Cooke, Ryan Calladine, Jonathan Plews, Mark Slater, Antonino Sergi, Dmitry Popov, Philip Ilten

Physics and Astronomy

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Abstract

An amplitude analysis of B−→J/ψΛp¯ decays is performed using about 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4MeV and 7.0±1.2±1.3MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Due to the small Q-value of the reaction, the most precise single measurement of the B− mass to date, 5279.44±0.05±0.07MeV, is obtained.

Original language	English
Article number	031901
Number of pages	11
Journal	Physical Review Letters
Volume	131
DOIs	https://doi.org/10.1103/PhysRevLett.131.031901
Publication status	Published - 17 Jul 2023

Bibliographical note

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-031.html (LHCb public pages)

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hep-ex

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LHCb2023ObservationFinal published version, 17.5 MBLicence: Creative Commons: Attribution (CC BY)

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title = "Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛp¯ decays",

abstract = "An amplitude analysis of B−→J/ψΛp¯ decays is performed using about 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4MeV and 7.0±1.2±1.3MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Due to the small Q-value of the reaction, the most precise single measurement of the B− mass to date, 5279.44±0.05±0.07MeV, is obtained.",

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T1 - Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛp¯ decays

AU - LHCb Collaboration

AU - Watson, Nigel

AU - Bifani, Simone

AU - Sahoo, Niladribihari

AU - Swallow, Paul

AU - Cooke, Naomi

AU - Calladine, Ryan

AU - Plews, Jonathan

AU - Slater, Mark

AU - Sergi, Antonino

AU - Popov, Dmitry

AU - Ilten, Philip

N1 - All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-031.html (LHCb public pages)

PY - 2023/7/17

Y1 - 2023/7/17

N2 - An amplitude analysis of B−→J/ψΛp¯ decays is performed using about 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4MeV and 7.0±1.2±1.3MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Due to the small Q-value of the reaction, the most precise single measurement of the B− mass to date, 5279.44±0.05±0.07MeV, is obtained.

AB - An amplitude analysis of B−→J/ψΛp¯ decays is performed using about 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4MeV and 7.0±1.2±1.3MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Due to the small Q-value of the reaction, the most precise single measurement of the B− mass to date, 5279.44±0.05±0.07MeV, is obtained.

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DO - 10.1103/PhysRevLett.131.031901

M3 - Article

SN - 0031-9007

VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 031901

ER -

Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛp¯ decays

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