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Record |
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Author  |
LHCb Collaboration (Aaij, R. et al); Fernandez Casani, A.; Jaimes Elles, S.J.; Jashal, B.K.; Libralon, S.; Martinez-Vidal, F.; Mazorra de Cos, J.; Oyanguren, A.; Rebollo De Miguel, M.; Sanderswood, I.; Zhuo, J. |
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Title |
Observation of a New Charmed Baryon Decaying to Ξ+c π-π+ |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
135 |
Issue |
16 |
Pages |
161901 - 14pp |
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Abstract |
The Xi(+)(c) pi(-)pi(+) spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb(-1), collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Xi(c) (2815)(+)] = 2816.65 +/- 0.03 +/- 0.03 +/- 0.23 MeV, Gamma[Xi(c) (2815)(+)] = 2.07 +/- 0.08 +/- 0.12 MeV, m[Xi(c) (2923)(+)] = 2922.8 +/- 0.3 +/- 0.5 +/- 0.2 MeV, Gamma[Xi(c) (2923)(+)] = 5.3 +/- 0.9 +/- 1.4 MeV, m[Xi(c) (2970)(+)] = 2968.6 +/- 0.5 +/- 0.5 +/- 0.2 MeV, Gamma[Xi(c) (2970)(+)] = 31.7 +/- 1.7 +/- 1.9 MeV, [Xi(c) (3080)(+)] = 3076.8 +/- 0.7 +/- 1.3 +/- 0.2 MeV, Gamma[Xi(c) (3080)(+)] = 6.8 +/- 2.3 +/- 0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Xi(+)(c) mass, respectively. The Xi(c)(2923)(+) baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Xi(c) (2923)(0) state. Most of the measured parameters are more precise than existing world averages. |
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Address |
[Bonacci, R. B.; Torres, M. Cruz; Dekkers, S.; Egede, U.; Fujii, Y.; Hadavizadeh, T.; Harris, T. H.; Henderson, R. D. L.; Lane, J. J.; Liu, F. L.; Monk, M.; Provenzano, D.; Saitta, B.; Song, R.; Walton, E. J.; Ward, J. A.] Monash Univ, Sch Phys & Astron, Melbourne, Vic, Australia |
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Publisher |
Amer Physical Soc |
Place of Publication |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
0031-9007 |
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Notes |
WOS:001639057300001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
7060 |
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