Observation of the Doubly Charmed Baryon Ξ_{cc}^{++}.
R Aaij,B Adeva,M Adinolfi, Z Ajaltouni,S Akar, J Albrecht, F Alessio, M Alexander,A Alfonso Albero,S Ali, G Alkhazov,P Alvarez Cartelle,A A Alves,S Amato,S Amerio,Y Amhis, L An,L Anderlini, G Andreassi,M Andreotti, J E Andrews,R B Appleby, F Archilli, P d'Argent,J Arnau Romeu, A Artamonov,M Artuso, E Aslanides, G Auriemma, M Baalouch,I Babuschkin,S Bachmann, J J Back, A Badalov, C Baesso,S Baker,V Balagura,W Baldini,A Baranov,R J Barlow, C Barschel, S Barsuk,W Barter,F Baryshnikov, V Batozskaya, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, A Beiter, L J Bel, N Beliy, V Bellee, N Belloli,K Belous, I Belyaev, E Ben-Haim, G Bencivenni,S Benson,S Beranek,A Berezhnoy, R Bernet, D Berninghoff, E Bertholet,A Bertolin,C Betancourt, F Betti,M-O Bettler,M van Beuzekom,Ia Bezshyiko, S Bifani,P Billoir, A Birnkraut, A Bitadze,A Bizzeti, M B Bjoern,T Blake,F Blanc,J Blouw,S Blusk,V Bocci, T Boettcher, A Bondar, N Bondar,W Bonivento,I Bordyuzhin, A Borgheresi,S Borghi, M 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PHYSICAL REVIEW LETTERS（2017）
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摘要
A highly significant structure is observed in the Lambda K-+(c)-pi(+)pi(+) mass spectrum, where the Lambda(+)(c) baryon is reconstructed in the decay mode pK(-)pi(+). The structure is consistent with originating from a weakly decaying particle, identified as the doubly charmed baryon Xi(++)(cc). The difference between the masses of the Xi(++)(cc) and Lambda(+)(c) states is measured to be 1334.94 +/- 0.72(stat.) +/- 0.27(syst.) MeV/c(2), and the Xi(++)(cc) mass is then determined to be 3621.40 +/- 0.72(stat.) +/- 0.27(syst.) +/- 0.14(Lambda(+)(c)) MeV/c(2), where the last uncertainty is due to the limited knowledge of the Lambda(+)(c) mass. The state is observed in a sample of proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 1.7 fb(-1), and confirmed in an additional sample of data collected at 8 TeV.
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