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Phys Rev Lett. 2018 Aug 17;121(7):072002. doi: 10.1103/PhysRevLett.121.072002.

Observation of a New Ξ_{b}^{-} Resonance.

Aaij R, Adeva B, Adinolfi M, Aidala CA, Ajaltouni Z, Akar S, Albicocco P, Albrecht J, Alessio F, Alexander M, Alfonso Albero A, Ali S, Alkhazov G, Alvarez Cartelle P, Alves AA, Amato S, Amerio S, Amhis Y, An L, Anderlini L, Andreassi G, Andreotti M, Andrews JE, Appleby RB, Archilli F, d'Argent P, Arnau Romeu J, Artamonov A, Artuso M, Arzymatov K, Aslanides E, Atzeni M, Bachmann S, Back JJ, Baker S, Balagura V, Baldini W, Baranov A, Barlow RJ, Barsuk S, Barter W, Baryshnikov F, Batozskaya V, Batsukh B, Battista V, Bay A, Beddow J, Bedeschi F, Bediaga I, Beiter A, Bel LJ, Beliy N, Bellee V, Belloli N, Belous K, Belyaev I, Ben-Haim E, Bencivenni G, Benson S, Beranek S, Berezhnoy A, Bernet R, Berninghoff D, Bertholet E, Bertolin A, Betancourt C, Betti F, Bettler MO, van Beuzekom M, Bezshyiko I, Bian L, Bifani S, Billoir P, Birnkraut A, Bizzeti A, Bjørn M, Blake T, Blanc F, Blusk S, Bobulska D, Bocci V, Boente Garcia O, Boettcher T, Bondar A, Bondar N, Borghi S, Borisyak M, Borsato M, Bossu F, Boubdir M, Bowcock TJV, Bozzi C, Braun S, Brodski M, Brodzicka J, Brundu D, Buchanan E, Buonaura A, Burr C, Bursche A, Buytaert J, Byczynski W, Cadeddu S, Cai H, Calabrese R, Calladine R, Calvi M, Calvo Gomez M, Camboni A, Campana P, Campora Perez DH, Capriotti L, Carbone A, Carboni G, Cardinale R, Cardini A, Carniti P, Carson L, Carvalho Akiba K, Casse G, Cassina L, Cattaneo M, Cavallero G, Cenci R, Chamont D, Chapman MG, Charles M, Charpentier P, Chatzikonstantinidis G, Chefdeville M, Chekalina V, Chen C, Chen S, Chitic SG, Chobanova V, Chrzaszcz M, Chubykin A, Ciambrone P, Cid Vidal X, Ciezarek G, Clarke PEL, Clemencic M, Cliff HV, Closier J, Coco V, Cogan J, Cogneras E, Cojocariu L, Collins P, Colombo T, Comerma-Montells A, Contu A, Coombs G, Coquereau S, Corti G, Corvo M, Costa Sobral CM, Couturier B, Cowan GA, Craik DC, Crocombe A, Cruz Torres M, Currie R, D'Ambrosio C, Da Cunha Marinho F, Da Silva CL, Dall'Occo E, Dalseno J, Danilina A, Davis A, De Aguiar Francisco O, De 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Wicht J, Wilkinson G, Wilkinson M, Williams MRJ, Williams M, Williams T, Wilson FF, Wimberley J, Winn M, Wishahi J, Wislicki W, Witek M, Wormser G, Wotton SA, Wyllie K, Xiao D, Xie Y, Xu A, Xu M, Xu Q, Xu Z, Xu Z, Yang Z, Yang Z, Yao Y, Yin H, Yu J, Yuan X, Yushchenko O, Zarebski KA, Zavertyaev M, Zhang D, Zhang L, Zhang WC, Zhang Y, Zhelezov A, Zheng Y, Zhu X, Zhukov V, Zonneveld JB, Zucchelli S; LHCb Collaboration.

Abstract

From samples of pp collision data collected by the LHCb experiment at sqrt[s]=7, 8 and 13 TeV, corresponding to integrated luminosities of 1.0, 2.0 and 1.5  fb^{-1}, respectively, a peak in both the Λ_{b}^{0}K^{-} and Ξ_{b}^{0}π^{-} invariant mass spectra is observed. In the quark model, radially and orbitally excited Ξ_{b}^{-} resonances with quark content bds are expected. Referring to this peak as Ξ_{b}(6227)^{-}, the mass and natural width are measured to be m_{Ξ_{b}(6227)^{-}}=6226.9±2.0±0.3±0.2  MeV/c^{2} and Γ_{Ξ_{b}(6227)^{-}}=18.1±5.4±1.8  MeV/c^{2}, where the first uncertainty is statistical, the second is systematic, and the third, on m_{Ξ_{b}(6227)^{-}}, is due to the knowledge of the Λ_{b}^{0} baryon mass. Relative production rates of the Ξ_{b}(6227)^{-}→Λ_{b}^{0}K^{-} and Ξ_{b}(6227)^{-}→Ξ_{b}^{0}π^{-} decays are also reported.

PMID:
30169090
DOI:
10.1103/PhysRevLett.121.072002
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