Journal articles
Observation of two new Ξ−b baryon resonances
R. Aaij
1
Y. Amhis
2
S. Barsuk
2
M. Borsato
2
O. Kochebina
2
J. Lefrançois
2
F. Machefert
2
A. Martin Sanchez
2
Marie Nicol
2
P. Robbe
2
M.-H. Schune
2
M. Teklishyn
2
A. Vallier
2
B. Viaud
2
L. Beaucourt
3
M. Chefdeville
3
D. Decamp
3
N. Déléage
3
Ph. Ghez
3
J.-P. Lees
3
J.F. Marchand
3
M.-N. Minard
3
B. Pietrzyk
3
W. Qian
3
S. t'Jampens
3
V. Tisserand
3
E. Tournefier
3
S. Akar
4
E. Aslanides
4
J. Cogan
4
W. Kanso
4
R. Legac
4
O. Leroy
4
G. Mancinelli
4
A. Mordà
4
J. Serrano
4
A. Tsaregorodtsev
4
A. Vallier 2
Author
B. Viaud 2
Author
L. Beaucourt 3
Author
M. Chefdeville 3
Author IdHAL : maximilien-chefdeville ORCID : https://orcid.org/0000-0002-6553-6493 arXiv : https://arxiv.org/a/Maximilien Chefdeville MC
S. t'Jampens 3
Author IdHAL : stephane-tjampens ORCID : https://orcid.org/0000-0003-4249-6641
V. Tisserand 3
Author
E. Tournefier 3
Author
S. Akar 4
Author
O. Leroy 4
Author IdHAL : olivier-leroy ORCID : https://orcid.org/0000-0002-2589-240X
G. Mancinelli 4
Author
A. Mordà 4
Author
J. Serrano 4
Author IdHAL : justine-serrano arXiv : https://arxiv.org/a/Justine Serrano ORCID : https://orcid.org/0000-0003-2489-7812
A. Tsaregorodtsev 4
Author
1
NIKHEF - National Institute for Subatomic Physics [Amsterdam] (Science Park 105
1098 XG Amsterdam - Netherlands)
2
LAL - Laboratoire de l'Accélérateur Linéaire (Centre Scientifique d'Orsay B.P. 34 91898 ORSAY Cedex - France)
- UP11 - Université Paris-Sud - Paris 11 (Bâtiment 300 - 91405 Orsay cedex - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- CNRS - Centre National de la Recherche Scientifique : UMR8607 (France)
3
LAPP - Laboratoire d'Annecy de Physique des Particules (9 Chemin de Bellevue - BP 110 - 74941 Annecy-le-Vieux CEDEX - France - France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- USMB [Université de Savoie] [Université de Chambéry] - Université Savoie Mont Blanc (27, rue Marcoz - 73000 Chambéry - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5814 (France)
4
CPPM - Centre de Physique des Particules de Marseille (163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR7346 (France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- AMU - Aix Marseille Université : UMR7346 (Aix-Marseille Université Jardins du Pharo 58 Boulevard Charles Livon 13284 Marseille cedex 7 - France)
Abstract : Two structures are observed close to the kinematic threshold in the Ξ0bπ− mass spectrum in a sample of proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb−1 recorded by the LHCb experiment. In the quark model, two baryonic resonances with quark content bds are expected in this mass region: the spin-parity JP=12+ and JP=32+ states, denoted Ξ′−b and Ξ∗−b. Interpreting the structures as these resonances, we measure the mass differences and the width of the heavier state to bem(Ξ′−b)−m(Ξ0b)−m(π−)=3.653±0.018±0.006 MeV/c2,m(Ξ∗−b)−m(Ξ0b)−m(π−)=23.96±0.12±0.06 MeV/c2,Γ(Ξ∗−b)=1.65±0.31±0.10 MeV, where the first and second uncertainties are statistical and systematic, respectively. The width of the lighter state is consistent with zero, and we place an upper limit of Γ(Ξ′−b)<0.08 MeV at 95% confidence level. Relative production rates of these states are also reported.
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Journal articles
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http://hal.in2p3.fr/in2p3-01084461
Contributor : Sabine Starita <>
Submitted on : Wednesday, November 19, 2014 - 12:03:24 PM
Last modification on : Monday, February 22, 2021 - 2:00:02 PM
Contributor : Sabine Starita <>
Submitted on : Wednesday, November 19, 2014 - 12:03:24 PM
Last modification on : Monday, February 22, 2021 - 2:00:02 PM
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- HAL Id : in2p3-01084461, version 1
- ARXIV : 1411.4849
- DOI : 10.1103/PhysRevLett.114.062004
Citation
R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Observation of two new Ξ−b baryon resonances. Physical Review Letters, American Physical Society, 2015, 114 (6), pp.062004. ⟨10.1103/PhysRevLett.114.062004⟩. ⟨in2p3-01084461⟩
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