Observation of excited Lambda_b0 baryons
R. Aaij
,
C. Adrover
(1)
,
Ziad Zj Ajaltouni
(2)
,
E. Aslanides
(1)
,
S. Barsuk
(3)
,
E. Ben-Haim
(4)
,
M. Benayoun
(4)
,
O. Callot
(3)
,
J. Cogan
(1)
,
E. Cogneras
(2)
,
P. David
(4)
,
I. de Bonis
(5)
,
D. Decamp
(5)
,
L. del Buono
(4)
,
O. Deschamps
(2)
,
I. El Rifai
(2)
,
Ph. Ghez
(5)
,
J. He
(3)
,
Pierre Henrard
(2)
,
M. Hoballah
(2)
,
P. Hopchev
(5)
,
Marwa Jahjah-Hussein
(2)
,
B. Jean-Marie
(3)
,
B. Khanji
(1)
,
O. Kochebina
(3)
,
R. Le Gac
(1)
,
J.-P. Lees
(5)
,
R. Lefevre
(2)
,
J. Lefrancois
(3)
,
O. Leroy
(1)
,
L. Li Gioi
(2)
,
I.V. Machikhiliyan
(5)
,
G. Mancinelli
(1)
,
A. Martens
(4)
,
E. Maurice
(1)
,
M.-N. Minard
(5)
,
S. Monteil
(2)
,
M. Nicol
(3)
,
V. Niess
(2)
,
Pascal Perret
(2)
,
M. Perrin-Terrin
(1)
,
B. Pietrzyk
(5)
,
F. Polci
(4)
,
Diego Alejandro Roa Romero
(2)
,
P. Robbe
(3)
,
M. Sapunov
(1)
,
M.-H. Schune
(3)
,
J. Serrano
(1)
,
Krzysztof Grzegorz Sobczak
(2)
,
S. t'Jampens
(5)
,
M. Teklishyn
(3)
,
V. Tisserand
(5)
,
E. Tournefier
(5)
,
B. Viaud
(3)
,
I. Videau
(3)
R. Aaij
- Function : Author
Ziad Zj Ajaltouni
- Function : Author
- PersonId : 903794
J. Cogan
- Function : Author
- PersonId : 750510
- IdHAL : julien-cogan
- ORCID : 0000-0001-7194-7566
- IdRef : 078779014
E. Cogneras
- Function : Author
- PersonId : 743220
- IdHAL : eric-cogneras
- ORCID : 0000-0002-8933-9427
L. del Buono
- Function : Author
- PersonId : 742055
- IdHAL : luigi-del-buono
- ORCID : 0000-0003-4774-2194
- IdRef : 253135834
O. Deschamps
- Function : Author
- PersonId : 12089
- IdHAL : olivier-deschamps
- ORCID : 0000-0002-7047-6042
- IdRef : 161447368
J. He
- Function : Author
- PersonId : 756138
- ORCID : 0000-0001-8179-417X
Pierre Henrard
- Function : Author
- PersonId : 829303
M. Hoballah
- Function : Author
- PersonId : 1174785
- IdHAL : mostafa-adam-hoballah-hobart
- ORCID : 0000-0002-9018-1639
O. Leroy
- Function : Author
- PersonId : 171866
- IdHAL : olivier-leroy
- ORCID : 0000-0002-2589-240X
- IdRef : 169871835
A. Martens
- Function : Author
- PersonId : 738690
- IdHAL : aurelien-martens
Pascal Perret
- Function : Author
- PersonId : 739797
- IdHAL : pascal-perret
- ORCID : 0000-0002-5732-4343
M. Perrin-Terrin
- Function : Author
- PersonId : 741779
- IdHAL : perrin-terrin
- ORCID : 0000-0002-3568-1956
- IdRef : 179269666
Diego Alejandro Roa Romero
- Function : Author
- PersonId : 769524
- IdRef : 172096839
J. Serrano
- Function : Author
- PersonId : 175327
- IdHAL : justine-serrano
- ORCID : 0000-0003-2489-7812
- IdRef : 127525521
S. t'Jampens
- Function : Author
- PersonId : 736045
- IdHAL : stephane-tjampens
- ORCID : 0000-0003-4249-6641
Abstract
Using pp collision data corresponding to 1.0 fb-1 integrated luminosity collected by the LHCb detector, two narrow states are observed in the Lambda_b0pi+pi- spectrum with masses 5911.95 +- 0.12(stat) +- 0.03(syst) +- 0.66(Lambda_b0 mass) MeV/c^2 and 5919.76 +- 0.07(stat) +- 0.02(syst) +- 0.66(Lambda_b0 mass) MeV/c^2. The significances of the observations are 4.9 and 10.1 standard deviations, respectively. These states are interpreted as the orbitally-excited Lambda_b0 baryons, Lambda_b*0(5912) and Lambda_b*0(5920).