An amplitude analysis of B- -> J/psi Lambda(p) over bar 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/psi Lambda 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 Q-value of the reaction, the most precise single measurement of the B- mass to date, 5279.44 +/- 0.05 +/- 0.07 MeV, is obtained.

Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛp¯ decays / Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Adlarson, P., Afsharnia, H., Agapopoulou, C., Aidala, C. a., Ajaltouni, Z., Akar, S., Akiba, K., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alvarez Cartelle, P., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:3(2023). [10.1103/physrevlett.131.031901]

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

Casse, G.;Sarti, A.;
2023

Abstract

An amplitude analysis of B- -> J/psi Lambda(p) over bar 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/psi Lambda 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 Q-value of the reaction, the most precise single measurement of the B- mass to date, 5279.44 +/- 0.05 +/- 0.07 MeV, is obtained.
2023
charmed baryons, limits on production of particles, charmed quarks, experimental tests
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of a J/ψΛ resonance consistent with a strange pentaquark candidate in B−→J/ψΛp¯ decays / Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., Adinolfi, M., Adlarson, P., Afsharnia, H., Agapopoulou, C., Aidala, C. a., Ajaltouni, Z., Akar, S., Akiba, K., Albrecht, J., Alessio, F., Alexander, M., Alfonso Albero, A., Aliouche, Z., Alvarez Cartelle, P., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 131:3(2023). [10.1103/physrevlett.131.031901]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1720421
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