Search for beautiful tetraquarks in the ϒ (1 S ) μ + μ − invariant-mass spectrum
R. Aaij, B. Adeva,M. Adinolfi,C. A. Aidala, Z. Ajaltouni,S. Akar,P. Albicocco,J. Albrecht, F. Alessio, M. Alexander,A. Alfonso Albero,S. Ali,G. Alkhazov,P. Alvarez Cartelle,A. A. Alves Jr,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,K. Arzymatov, E. Aslanides,M. Atzeni,B. Audurier,S. Bachmann,J. J. Back,S. Baker,V. Balagura,W. Baldini,A. Baranov,R. J. Barlow,S. Barsuk,W. Barter,F. Baryshnikov, V. Batozskaya, B. Batsukh, V. Battista, A. Bay, J. Beddow, F. Bedeschi, I. Bediaga, A. Beiter, L. J. Bel,S. Belin,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. Bhasin,J. Bhom,S. Bifani,P. Billoir, A. Birnkraut, A. Bizzeti,M. Bjørn,M. P. Blago,T. Blake,F. Blanc,S. Blusk,D. Bobulska,V. Bocci,O. Boente Garcia,T. Boettcher,A. Bondar,N. Bondar, S. Borghi, M. Borisyak, M. Borsato, F. Bossu, M. Boubdir,T. J. V. Bowcock,C. Bozzi,S. Braun,M. Brodski, J. Brodzicka,A. Brossa Gonzalo,D. Brundu, E. Buchanan, A. Buonaura,C. Burr,A. Bursche, J. Buytaert,W. Byczynski,S. Cadeddu,H. Cai,R. Calabrese,R. Calladine, M. Calvi,M. Calvo Gomez,A. Camboni,P. Campana,D. H. Campora Perez,L. Capriotti,A. Carbone,G. Carboni, R. Cardinale, A. Cardini, P. Carniti,L. Carson,K. Carvalho Akiba,G. Casse,L. Cassina,M. Cattaneo,G. Cavallero, R. Cenci, D. Chamont,M. G. Chapman,M. Charles,Ph. Charpentier,G. Chatzikonstantinidis, M. Chefdeville,V. Chekalina,C. Chen,S. Chen,S.-G. Chitic,V. Chobanova,M. Chrzaszcz, A. Chubykin, P. Ciambrone,X. Cid Vidal,G. Ciezarek, P. E. L. Clarke, M. Clemencic, H. V. Cliff, J. Closier,V. Coco,J. A. B. Coelho,J. Cogan,E. Cogneras, L. Cojocariu,P. Collins,T. Colombo, A. Comerma-Montells, A. Contu, G. Coombs, S. Coquereau,G. Corti,M. Corvo,C. M. Costa Sobral,B. Couturier,G. A. Cowan,D. C. Craik,A. Crocombe,M. Cruz Torres,R. Currie,C. D’Ambrosio,F. Da Cunha Marinho,C. L. Da Silva,E. Dall’Occo, J. Dalseno, A. Danilina,A. Davis,O. De Aguiar Francisco,K. De Bruyn,S. De Capua,M. De Cian,J. M. De Miranda,L. De Paula,M. De Serio,P. De Simone,C. T. Dean,D. Decamp,L. Del Buono,B. Delaney,H.-P. Dembinski, M. Demmer, A. Dendek, D. Derkach, O. Deschamps, F. Desse, F. Dettori,B. Dey,A. Di Canto,P. Di Nezza,S. Didenko,H. Dijkstra,F. Dordei,M. Dorigo,A. Dosil Suárez,L. Douglas, A. Dovbnya, K. Dreimanis,L. Dufour,G. Dujany, P. Durante,J. M. Durham,D. Dutta,R. Dzhelyadin, M. Dziewiecki, A. Dziurda, A. Dzyuba, S. Easo,U. Egede,V. Egorychev,S. Eidelman,S. Eisenhardt,U. Eitschberger, R. Ekelhof, L. Eklund,S. Ely,A. Ene,S. Escher,S. Esen,T. Evans,A. Falabella, N. Farley, S. Farry, D. Fazzini, L. Federici,P. Fernandez Declara,A. Fernandez Prieto,F. Ferrari,L. Ferreira Lopes,F. Ferreira Rodrigues,M. Ferro-Luzzi,S. Filippov,R. A. Fini,M. Fiorini,M. Firlej,C. Fitzpatrick,T. 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Heinicke, A. Heister, K. Hennessy,L. Henry,E. van Herwijnen,M. Heß,A. Hicheur,R. Hidalgo Charman,D. Hill,M. Hilton,P. H. Hopchev,W. Hu,W. Huang,Z. C. Huard,W. Hulsbergen,T. Humair, M. Hushchyn, D. Hutchcroft,D. Hynds,P. Ibis, M. Idzik, P. Ilten,K. Ivshin,R. Jacobsson, J. Jalocha, E. Jans,A. Jawahery,F. Jiang,M. John,D. Johnson,C. R. Jones,C. Joram,B. Jost,N. Jurik,S. Kandybei,M. Karacson,J. M. Kariuki,S. Karodia,N. Kazeev, M. Kecke, F. Keizer,M. Kelsey,M. Kenzie,T. Ketel,E. Khairullin, B. Khanji, C. Khurewathanakul, K. E. Kim,T. Kirn,S. Klaver,K. Klimaszewski,T. Klimkovich,S. Koliiev,M. Kolpin, R. Kopecna, P. Koppenburg, I. Kostiuk,S. Kotriakhova,M. Kozeiha, L. Kravchuk, M. Kreps, F. Kress, P. Krokovny,W. Krupa,W. Krzemien,W. Kucewicz,M. Kucharczyk,V. Kudryavtsev,A. K. Kuonen,T. Kvaratskheliya, D. Lacarrere, G. Lafferty,A. Lai,D. Lancierini, G. Lanfranchi, C. Langenbruch,T. Latham,C. Lazzeroni,R. Le Gac,A. Leflat, J. Lefrançois,R. Lefèvre,F. Lemaitre,O. Leroy,T. Lesiak,B. 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Poli Lener,A. Poluektov, N. Polukhina, I. Polyakov, E. Polycarpo,G. J. Pomery,S. Ponce,A. Popov,D. Popov,S. Poslavskii,C. Potterat,E. Price,J. Prisciandaro,C. Prouve, V. Pugatch,A. Puig Navarro,H. Pullen, G. Punzi, W. Qian,J. Qin,R. Quagliani, B. Quintana, B. Rachwal, J. H. Rademacker,M. Rama,M. Ramos Pernas,M. S. Rangel,F. Ratnikov,G. Raven,M. Ravonel Salzgeber,M. Reboud, F. Redi,S. Reichert,A. C. dos Reis,F. Reiss,C. Remon Alepuz,Z. Ren,V. Renaudin,S. Ricciardi,S. Richards,K. Rinnert, P. Robbe,A. Robert,A. B. Rodrigues,E. Rodrigues, J. A. Rodriguez Lopez,M. Roehrken,A. Rogozhnikov,S. Roiser, A. Rollings,V. Romanovskiy,A. Romero Vidal,M. Rotondo, M. S. Rudolph,T. Ruf,J. Ruiz Vidal,J. J. Saborido Silva,N. Sagidova, B. Saitta,V. Salustino Guimaraes,C. Sanchez Gras,C. Sanchez Mayordomo,B. Sanmartin Sedes,R. Santacesaria,C. Santamarina Rios,M. Santimaria, E. Santovetti, G. Sarpis,A. Sarti,C. Satriano,A. Satta,M. Saur, D. Savrina,S. Schael,M. Schellenberg,M. Schiller,H. Schindler,M. 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Tou,R. Tourinho Jadallah Aoude,E. Tournefier, M. Traill,M. T. Tran,A. Trisovic, A. Tsaregorodtsev, G. Tuci, A. Tully, N. Tuning, A. Ukleja, A. Usachov,A. Ustyuzhanin,U. Uwer,A. Vagner,V. Vagnoni,A. Valassi,S. Valat,G. Valenti,R. Vazquez Gomez,P. Vazquez Regueiro,S. Vecchi,M. van Veghel,J. J. Velthuis,M. Veltri,G. Veneziano,A. Venkateswaran,T. A. Verlage,M. Vernet,M. Veronesi,N. V. Veronika,M. Vesterinen,J. V. Viana Barbosa,D. Vieira,M. Vieites Diaz,H. Viemann,X. Vilasis-Cardona,A. Vitkovskiy, M. Vitti,V. Volkov,A. Vollhardt, B. Voneki, A. Vorobyev,V. Vorobyev,J. A. de Vries,C. Vázquez Sierra,R. Waldi, J. Walsh, J. Wang,M. Wang,Y. Wang,Z. Wang,D. R. Ward,H. M. Wark,N. K. Watson, D. Websdale, A. Weiden, C. Weisser,M. Whitehead,J. Wicht,G. Wilkinson,M. Wilkinson,I. Williams,M. R. J. Williams,M. Williams,T. Williams,F. F. Wilson, J. Wimberley, M. Winn, J. Wishahi,W. Wislicki,M. Witek,G. Wormser,S. A. Wotton,K. Wyllie, D. Xiao,Y. Xie,A. Xu,M. Xu,Q. Xu,Z. Xu,Z. Xu,Z. Yang,Z. Yang,Y. Yao,L. E. Yeomans,H. Yin,J. Yu,X. Yuan,O. Yushchenko,K. A. Zarebski,M. Zavertyaev,D. Zhang,L. Zhang,W. C. Zhang,Y. Zhang, A. Zhelezov,Y. Zheng,X. Zhu,V. Zhukov,J. B. Zonneveld,S. Zucchelli
Journal of High Energy Physics（2018）
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摘要
The ϒ (1 S ) μ + μ − invariant-mass distribution is investigated for a possible exotic meson state composed of two b quarks and two b quarks, X_bbbb . The analysis is based on a data sample of pp collisions recorded with the LHCb detector at centre-of-mass energies √(s)=7 , 8 and 13 TeV, corresponding to an integrated luminosity of 6.3 fb −1 . No significant excess is found, and upper limits are set on the product of the production cross-section and the branching fraction as functions of the mass of the X_bbbb state. The limits are set in the fiducial volume where all muons have pseudorapidity in the range [2 . 0 , 5 . 0], and the X_bbbb state has rapidity in the range [2 . 0 , 4 . 5] and transverse momentum less than 15 GeV/ c .
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关键词
B physics,Exotics,Hadron-Hadron scattering (experiments),Heavy quark production
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