Observation of a 𝐽/𝜓Λ resonance consistent with a strange pentaquark candidate in 𝐵−→𝐽/𝜓Λp[bar] decays
An amplitude analysis of 𝐵−→𝐽/𝜓Λ‾𝑝 decays is performed using 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 syst...
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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
17 July 2023
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| In: |
Physical review letters
Year: 2023, Volume: 131, Issue: 3, Pages: 1-11 |
| ISSN: | 1079-7114 |
| DOI: | 10.1103/PhysRevLett.131.031901 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.131.031901 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.131.031901 
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| Author Notes: | R. Aaij et al. (LHCb Collaboration)* |
MARC
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| 245 | 1 | 0 | |a Observation of a /Λ resonance consistent with a strange pentaquark candidate in −→/Λp[bar] decays |c R. Aaij et al. (LHCb Collaboration)* |
| 246 | 3 | 3 | |a Observation of a / psi Lambda resonance consistent with a strange pentaquark candidate in − → / psi Lambda p [bar] decays |
| 264 | 1 | |c 17 July 2023 | |
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| 500 | |a *LHCb Collaboration: R. Aaij, S. Bachmann, D. Berninghoff, M. Borsato, R. Caspary, G. Frau, P.A. Günther, X. Han, S. Hansmann-Menzemer, J. Hu, R. Kopecna, B. Leverington, J. Marks, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, A. Zhelezov [und 1054 weitere Personen] | ||
| 500 | |a Im Titel ist das Minuszeichen hochgestellt | ||
| 500 | |a Im Titel steht der Buchstabe p mit einem Oberstrich | ||
| 500 | |a Gesehen am 03.07.2024 | ||
| 520 | |a An amplitude analysis of −→/Λ‾ decays is performed using 4400 signal candidates selected on a data sample of 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 /Λ 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±0.4 MeV and 7.0±1.2±1.3 MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Because of the small -value of the reaction, the most precise single measurement of the − mass to date, 5279.44±0.05±0.07 MeV, is obtained. | ||
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