Evidence Of A J/Psi Lambda Structure And Observation Of Excited Xi(-) States In The Xi(-)(B) -> J/Psi Lambda K- Decay
R. Aaij,C. Abellan Beteta,T. Ackernley,B. Adeva,M. Adinolfi,H. Afsharnia,C. A. Aidala,S. Aiola,Z. Ajaltouni,S. Akar,J. Albrecht, F. Alessio,M. Alexander,A. Alfonso Albero,Z. Aliouche,G. Alkhazov,P. Alvarez Cartelle, S. Amato,Y. Amhis,L. An,L. Anderlini,A. Andreianov,M. Andreotti,F. Archilli,A. Artamonov,M. Artuso, K. Arzymatov,E. Aslanides,M. Atzeni,B. Audurier,S. Bachmann,M. Bachmayer, J. J. Back, S. Baker,P. Baladron Rodriguez,V Balagura,W. Baldini,J. Baptista Leite,R. J. Barlow, S. Barsuk,W. Barter,M. Bartolini,F. Baryshnikov,J. M. Basels,G. Bassi,B. Batsukh,A. Battig,A. Bay,M. Becker, F. Bedeschi,I Bediaga,A. Beiter,V Belavin,S. Belin,V Bellee,K. Belous,I Belov,I Belyaev, G. Bencivenni, E. Ben-Haim,A. Berezhnoy,R. Bernet,D. Berninghoff, H. C. Bernstein,C. Bertella,E. Bertholet,A. Bertolin,C. Betancourt,F. Betti,Ia Bezshyiko,S. Bhasin,J. Bhom,L. Bian,M. S. Bieker,S. Bifani,P. Billoir,M. Birch, F. C. R. Bishop,A. Bizzeti,M. Bjorn,M. P. Blago,T. Blake,F. Blanc,S. Blusk,D. 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SCIENCE BULLETIN（2021）
Cited 104|Views32
Abstract
First evidence of a structure in the J/psi Lambda invariant mass distribution is obtained from an amplitude analysis of Xi(-)(b) -> J/psi Lambda K- decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect. Its mass and width are determined to be 4458.8 +/- 2.9(-1.1)(+4.7) MeV and 17.3 +/- 6.5(-5.7)(+8.0) MeV, respectively, where the quoted uncertainties are statistical and systematic. The structure is also consistent with being due to two resonances. In addition, the narrow excited Xi(-) states, Xi(-)(1690) and Xi(-)(1820)(-), are seen for the first time in a Xi(-)(b) decay, and their masses and widths are measured with improved precision. The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb(-1), collected with the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
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Key words
QCD, Exotics, Pentaquark, Spectroscopy, Quarkonium, Particle and resonance production
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