Direct observation of the strange b baryon Xib-

V M Abazov; B Abbott; M Abolins; B S Acharya; M Adams; T Adams; E Aguilo; S H Ahn; M Ahsan; G D Alexeev; G Alkhazov; A Alton; G Alverson; G A Alves; M Anastasoaie; L S Ancu; T Andeen; S Anderson; B Andrieu; M S Anzelc; Y Arnoud; M Arov; M Arthaud; A Askew; B Asman; A C S Assis Jesus; O Atramentov; C Autermann; C Avila; C Ay; F Badaud; A Baden; L Bagby; B Baldin; D V Bandurin; S Banerjee; P Banerjee; E Barberis; A-F Barfuss; P Bargassa; P Baringer; J Barreto; J F Bartlett; U Bassler; D Bauer; S Beale; A Bean; M Begalli; M Begel; C Belanger-Champagne; L Bellantoni; A Bellavance; J A Benitez; S B Beri; G Bernardi; R Bernhard; L Berntzon; I Bertram; M Besançon; R Beuselinck; V A Bezzubov; P C Bhat; V Bhatnagar; C Biscarat; G Blazey; F Blekman; S Blessing; D Bloch; K Bloom; A Boehnlein; D Boline; T A Bolton; G Borissov; K Bos; T Bose; A Brandt; R Brock; G Brooijmans; A Bross; D Brown; N J Buchanan; D Buchholz; M Buehler; V Buescher; S Burdin; S Burke; T H Burnett; C P Buszello; J M Butler; P Calfayan; S Calvet; J Cammin; S Caron; W Carvalho; B C K Casey; N M Cason; H Castilla-Valdez; S Chakrabarti; D Chakraborty; K M Chan; K Chan; A Chandra; F Charles; E Cheu; F Chevallier; D K Cho; S Choi; B Choudhary; L Christofek; T Christoudias; S Cihangir; D Claes; C Clément; B Clément; Y Coadou; M Cooke; W E Cooper; M Corcoran; F Couderc; M-C Cousinou; S Crépé-Renaudin; D Cutts; M Cwiok; H da Motta; A Das; G Davies; K De; S J de Jong; P de Jong; E De La Cruz-Burelo; C De Oliveira Martins; J D Degenhardt; F Déliot; M Demarteau; R Demina; D Denisov; S P Denisov; S Desai; H T Diehl; M Diesburg; A Dominguez; H Dong; L V Dudko; L Duflot; S R Dugad; D Duggan; A Duperrin; J Dyer; A Dyshkant; M Eads; D Edmunds; J Ellison; V D Elvira; Y Enari; S Eno; P Ermolov; H Evans; A Evdokimov; V N Evdokimov; A V Ferapontov; T Ferbel; F Fiedler; F Filthaut; W Fisher; H E Fisk; M Ford; M Fortner; H Fox; S Fu; S Fuess; T Gadfort; C F Galea; E Gallas; E Galyaev; C Garcia; A Garcia-Bellido; V Gavrilov; P Gay; W Geist; D Gelé; C E Gerber; Y Gershtein; D Gillberg; G Ginther; N Gollub; B Gómez; A Goussiou; P D Grannis; H Greenlee; Z D Greenwood; E M Gregores; G Grenier; Ph Gris; J-F Grivaz; A Grohsjean; S Grünendahl; M W Grünewald; J Guo; F Guo; P Gutierrez; G Gutierrez; A Haas; N J Hadley; P Haefner; S Hagopian; J Haley; I Hall; R E Hall; L Han; K Hanagaki; P Hansson; K Harder; A Harel; R Harrington; J M Hauptman; R Hauser; J Hays; T Hebbeker; D Hedin; J G Hegeman; J M Heinmiller; A P Heinson; U Heintz; C Hensel; K Herner; G Hesketh; M D Hildreth; R Hirosky; J D Hobbs; B Hoeneisen; H Hoeth; M Hohlfeld; S J Hong; R Hooper; S Hossain; P Houben; Y Hu; Z Hubacek; V Hynek; I Iashvili; R Illingworth; A S Ito; S Jabeen; M Jaffré; S Jain; K Jakobs; C Jarvis; R Jesik; K Johns; C Johnson; M Johnson; A Jonckheere; P Jonsson; A Juste; D Käfer; S Kahn; E Kajfasz; A M Kalinin; J R Kalk; J M Kalk; S Kappler; D Karmanov; J Kasper; P Kasper; I Katsanos; D Kau; R Kaur; V Kaushik; R Kehoe; S Kermiche; N Khalatyan; A Khanov; A Kharchilava; Y M Kharzheev; D Khatidze; H Kim; T J Kim; M H Kirby; M Kirsch; B Klima; J M Kohli; J-P Konrath; M Kopal; V M Korablev; B Kothari; A V Kozelov; D Krop; A Kryemadhi; T Kuhl; A Kumar; S Kunori; A Kupco; T Kurca; J Kvita; F Lacroix; D Lam; S Lammers; G Landsberg; J Lazoflores; P Lebrun; W M Lee; A Leflat; F Lehner; J Lellouch; V Lesne; J Leveque; P Lewis; J Li; Q Z Li; L Li; S M Lietti; J G R Lima; D Lincoln; J Linnemann; V V Lipaev; R Lipton; Y Liu; Z Liu; L Lobo; A Lobodenko; M Lokajicek; A Lounis; P Love; H J Lubatti; A L Lyon; A K A Maciel; D Mackin; R J Madaras; P Mättig; C Magass; A Magerkurth; N Makovec; P K Mal; H B Malbouisson; S Malik; V L Malyshev; H S Mao; Y Maravin; B Martin; R McCarthy; A Melnitchouk; A Mendes; L Mendoza; P G Mercadante; Y P Merekov; M Merkin; K W Merritt; J Meyer; A Meyer; M Michaut; T Millet; J Mitrevski; J Molina; R K Mommsen; N K Mondal; R W Moore; T Moulik; G S Muanza; M Mulders; M Mulhearn; O Mundal; L Mundim; E Nagy; M Naimuddin; M Narain; N A Naumann; H A Neal; J P Negret; P Neustroev; H Nilsen; A Nomerotski; S F Novaes; T Nunnemann; V O'Dell; D C O'Neil; G Obrant; C Ochando; D Onoprienko; N Oshima; J Osta; R Otec; G J Otero y Garzón; M Owen; P Padley; M Pangilinan; G Panov; N Parashar; S-J Park; S K Park; J Parsons; R Partridge; N Parua; A Patwa; G Pawloski; B Penning; P M Perea; K Peters; Y Peters; P Pétroff; M Petteni; R Piegaia; J Piper; M-A Pleier; P L M Podesta-Lerma; V M Podstavkov; Y Pogorelov; M-E Pol; P Polozov; A Pompos; B G Pope; A V Popov; C Potter; W L Prado da Silva; H B Prosper; S Protopopescu; J Qian; A Quadt; B Quinn; A Rakitine; M S Rangel; K J Rani; K Ranjan; P N Ratoff; P Renkel; S Reucroft; P Rich; M Rijssenbeek; I Ripp-Baudot; F Rizatdinova; S Robinson; R F Rodrigues; C Royon; A Rozhdestvenski; P Rubinov; R Ruchti; G Safronov; G Sajot; A Sánchez-Hernández; M P Sanders; A Santoro; G Savage; L Sawyer; T Scanlon; D Schaile; R D Schamberger; Y Scheglov; H Schellman; P Schieferdecker; T Schliephake; C Schmitt; C Schwanenberger; A Schwartzman; R Schwienhorst; J Sekaric; S Sengupta; H Severini; E Shabalina; M Shamim; V Shary; A A Shchukin; R K Shivpuri; D Shpakov; V Siccardi; V Simak; V Sirotenko; P Skubic; P Slattery; D Smirnov; R P Smith; J Snow; G R Snow; S Snyder; S Söldner-Rembold; L Sonnenschein; A Sopczak; M Sosebee; K Soustruznik; M Souza; B Spurlock; J Stark; J Steele; V Stolin; A Stone; D A Stoyanova; J Strandberg; S Strandberg; M A Strang; M Strauss; E Strauss; R Ströhmer; D Strom; M Strovink; L Stutte; S Sumowidagdo; P Svoisky; A Sznajder; M Talby; P Tamburello; A Tanasijczuk; W Taylor; P Telford; J Temple; B Tiller; F Tissandier; M Titov; V V Tokmenin; M Tomoto; T Toole; I Torchiani; T Trefzger; D Tsybychev; B Tuchming; C Tully; P M Tuts; R Unalan; S Uvarov; L Uvarov; S Uzunyan; B Vachon; P J van den Berg; B van Eijk; R Van Kooten; W M van Leeuwen; N Varelas; E W Varnes; A Vartapetian; I A Vasilyev; M Vaupel; P Verdier; L S Vertogradov; Y Vertogradova; M Verzocchi; F Villeneuve-Seguier; P Vint; P Vokac; E Von Toerne; M Voutilainen; M Vreeswijk; R Wagner; H D Wahl; L Wang; M H L S Wang; J Warchol; G Watts; M Wayne; M Weber; G Weber; H Weerts; A Wenger; N Wermes; M Wetstein; A White; D Wicke; G W Wilson; S J Wimpenny; M Wobisch; D R Wood; T R Wyatt; Y Xie; S Yacoob; R Yamada; M Yan; T Yasuda; Y A Yatsunenko; K Yip; H D Yoo; S W Youn; J Yu; C Yu; A Yurkewicz; A Zatserklyaniy; C Zeitnitz; D Zhang; T Zhao; B Zhou; J Zhu; M Zielinski; D Zieminska; A Zieminski; L Zivkovic; V Zutshi; E G Zverev; D0 Collaboration

doi:10.1103/PhysRevLett.99.052001

Direct observation of the strange b baryon Xib-

Phys Rev Lett. 2007 Aug 3;99(5):052001. doi: 10.1103/PhysRevLett.99.052001. Epub 2007 Aug 3.

Authors

V M Abazov¹, B Abbott, M Abolins, B S Acharya, M Adams, T Adams, E Aguilo, S H Ahn, M Ahsan, G D Alexeev, G Alkhazov, A Alton, G Alverson, G A Alves, M Anastasoaie, L S Ancu, T Andeen, S Anderson, B Andrieu, M S Anzelc, Y Arnoud, M Arov, M Arthaud, A Askew, B Asman, A C S Assis Jesus, O Atramentov, C Autermann, C Avila, C Ay, F Badaud, A Baden, L Bagby, B Baldin, D V Bandurin, S Banerjee, P Banerjee, E Barberis, A-F Barfuss, P Bargassa, P Baringer, J Barreto, J F Bartlett, U Bassler, D Bauer, S Beale, A Bean, M Begalli, M Begel, C Belanger-Champagne, L Bellantoni, A Bellavance, J A Benitez, S B Beri, G Bernardi, R Bernhard, L Berntzon, I Bertram, M Besançon, R Beuselinck, V A Bezzubov, P C Bhat, V Bhatnagar, C Biscarat, G Blazey, F Blekman, S Blessing, D Bloch, K Bloom, A Boehnlein, D Boline, T A Bolton, G Borissov, K Bos, T Bose, A Brandt, R Brock, G Brooijmans, A Bross, D Brown, N J Buchanan, D Buchholz, M Buehler, V Buescher, S Burdin, S Burke, T H Burnett, C P Buszello, J M Butler, P Calfayan, S Calvet, J Cammin, S Caron, W Carvalho, B C K Casey, N M Cason, H Castilla-Valdez, S Chakrabarti, D Chakraborty, K M Chan, K Chan, A Chandra, F Charles, E Cheu, F Chevallier, D K Cho, S Choi, B Choudhary, L Christofek, T Christoudias, S Cihangir, D Claes, C Clément, B Clément, Y Coadou, M Cooke, W E Cooper, M Corcoran, F Couderc, M-C Cousinou, S Crépé-Renaudin, D Cutts, M Cwiok, H da Motta, A Das, G Davies, K De, S J de Jong, P de Jong, E De La Cruz-Burelo, C De Oliveira Martins, J D Degenhardt, F Déliot, M Demarteau, R Demina, D Denisov, S P Denisov, S Desai, H T Diehl, M Diesburg, A Dominguez, H Dong, L V Dudko, L Duflot, S R Dugad, D Duggan, A Duperrin, J Dyer, A Dyshkant, M Eads, D Edmunds, J Ellison, V D Elvira, Y Enari, S Eno, P Ermolov, H Evans, A Evdokimov, V N Evdokimov, A V Ferapontov, T Ferbel, F Fiedler, F Filthaut, W Fisher, H E Fisk, M Ford, M Fortner, H Fox, S Fu, S Fuess, T Gadfort, C F Galea, E Gallas, E Galyaev, C Garcia, A Garcia-Bellido, V Gavrilov, P Gay, W Geist, D Gelé, C E Gerber, Y Gershtein, D Gillberg, G Ginther, N Gollub, B Gómez, A Goussiou, P D Grannis, H Greenlee, Z D Greenwood, E M Gregores, G Grenier, Ph Gris, J-F Grivaz, A Grohsjean, S Grünendahl, M W Grünewald, J Guo, F Guo, P Gutierrez, G Gutierrez, A Haas, N J Hadley, P Haefner, S Hagopian, J Haley, I Hall, R E Hall, L Han, K Hanagaki, P Hansson, K Harder, A Harel, R Harrington, J M Hauptman, R Hauser, J Hays, T Hebbeker, D Hedin, J G Hegeman, J M Heinmiller, A P Heinson, U Heintz, C Hensel, K Herner, G Hesketh, M D Hildreth, R Hirosky, J D Hobbs, B Hoeneisen, H Hoeth, M Hohlfeld, S J Hong, R Hooper, S Hossain, P Houben, Y Hu, Z Hubacek, V Hynek, I Iashvili, R Illingworth, A S Ito, S Jabeen, M Jaffré, S Jain, K Jakobs, C Jarvis, R Jesik, K Johns, C Johnson, M Johnson, A Jonckheere, P Jonsson, A Juste, D Käfer, S Kahn, E Kajfasz, A M Kalinin, J R Kalk, J M Kalk, S Kappler, D Karmanov, J Kasper, P Kasper, I Katsanos, D Kau, R Kaur, V Kaushik, R Kehoe, S Kermiche, N Khalatyan, A Khanov, A Kharchilava, Y M Kharzheev, D Khatidze, H Kim, T J Kim, M H Kirby, M Kirsch, B Klima, J M Kohli, J-P Konrath, M Kopal, V M Korablev, B Kothari, A V Kozelov, D Krop, A Kryemadhi, T Kuhl, A Kumar, S Kunori, A Kupco, T Kurca, J Kvita, F Lacroix, D Lam, S Lammers, G Landsberg, J Lazoflores, P Lebrun, W M Lee, A Leflat, F Lehner, J Lellouch, V Lesne, J Leveque, P Lewis, J Li, Q Z Li, L Li, S M Lietti, J G R Lima, D Lincoln, J Linnemann, V V Lipaev, R Lipton, Y Liu, Z Liu, L Lobo, A Lobodenko, M Lokajicek, A Lounis, P Love, H J Lubatti, A L Lyon, A K A Maciel, D Mackin, R J Madaras, P Mättig, C Magass, A Magerkurth, N Makovec, P K Mal, H B Malbouisson, S Malik, V L Malyshev, H S Mao, Y Maravin, B Martin, R McCarthy, A Melnitchouk, A Mendes, L Mendoza, P G Mercadante, Y P Merekov, M Merkin, K W Merritt, J Meyer, A Meyer, M Michaut, T Millet, J Mitrevski, J Molina, R K Mommsen, N K Mondal, R W Moore, T Moulik, G S Muanza, M Mulders, M Mulhearn, O Mundal, L Mundim, E Nagy, M Naimuddin, M Narain, N A Naumann, H A Neal, J P Negret, P Neustroev, H Nilsen, A Nomerotski, S F Novaes, T Nunnemann, V O'Dell, D C O'Neil, G Obrant, C Ochando, D Onoprienko, N Oshima, J Osta, R Otec, G J Otero y Garzón, M Owen, P Padley, M Pangilinan, G Panov, N Parashar, S-J Park, S K Park, J Parsons, R Partridge, N Parua, A Patwa, G Pawloski, B Penning, P M Perea, K Peters, Y Peters, P Pétroff, M Petteni, R Piegaia, J Piper, M-A Pleier, P L M Podesta-Lerma, V M Podstavkov, Y Pogorelov, M-E Pol, P Polozov, A Pompos, B G Pope, A V Popov, C Potter, W L Prado da Silva, H B Prosper, S Protopopescu, J Qian, A Quadt, B Quinn, A Rakitine, M S Rangel, K J Rani, K Ranjan, P N Ratoff, P Renkel, S Reucroft, P Rich, M Rijssenbeek, I Ripp-Baudot, F Rizatdinova, S Robinson, R F Rodrigues, C Royon, A Rozhdestvenski, P Rubinov, R Ruchti, G Safronov, G Sajot, A Sánchez-Hernández, M P Sanders, A Santoro, G Savage, L Sawyer, T Scanlon, D Schaile, R D Schamberger, Y Scheglov, H Schellman, P Schieferdecker, T Schliephake, C Schmitt, C Schwanenberger, A Schwartzman, R Schwienhorst, J Sekaric, S Sengupta, H Severini, E Shabalina, M Shamim, V Shary, A A Shchukin, R K Shivpuri, D Shpakov, V Siccardi, V Simak, V Sirotenko, P Skubic, P Slattery, D Smirnov, R P Smith, J Snow, G R Snow, S Snyder, S Söldner-Rembold, L Sonnenschein, A Sopczak, M Sosebee, K Soustruznik, M Souza, B Spurlock, J Stark, J Steele, V Stolin, A Stone, D A Stoyanova, J Strandberg, S Strandberg, M A Strang, M Strauss, E Strauss, R Ströhmer, D Strom, M Strovink, L Stutte, S Sumowidagdo, P Svoisky, A Sznajder, M Talby, P Tamburello, A Tanasijczuk, W Taylor, P Telford, J Temple, B Tiller, F Tissandier, M Titov, V V Tokmenin, M Tomoto, T Toole, I Torchiani, T Trefzger, D Tsybychev, B Tuchming, C Tully, P M Tuts, R Unalan, S Uvarov, L Uvarov, S Uzunyan, B Vachon, P J van den Berg, B van Eijk, R Van Kooten, W M van Leeuwen, N Varelas, E W Varnes, A Vartapetian, I A Vasilyev, M Vaupel, P Verdier, L S Vertogradov, Y Vertogradova, M Verzocchi, F Villeneuve-Seguier, P Vint, P Vokac, E Von Toerne, M Voutilainen, M Vreeswijk, R Wagner, H D Wahl, L Wang, M H L S Wang, J Warchol, G Watts, M Wayne, M Weber, G Weber, H Weerts, A Wenger, N Wermes, M Wetstein, A White, D Wicke, G W Wilson, S J Wimpenny, M Wobisch, D R Wood, T R Wyatt, Y Xie, S Yacoob, R Yamada, M Yan, T Yasuda, Y A Yatsunenko, K Yip, H D Yoo, S W Youn, J Yu, C Yu, A Yurkewicz, A Zatserklyaniy, C Zeitnitz, D Zhang, T Zhao, B Zhou, J Zhu, M Zielinski, D Zieminska, A Zieminski, L Zivkovic, V Zutshi, E G Zverev; D0 Collaboration

Affiliation

¹ Joint Institute for Nuclear Research, Dubna, Russia.

PMID: 17930744
DOI: 10.1103/PhysRevLett.99.052001

Abstract

We report the first direct observation of the strange b baryon Xi(b)- (Xi(b)+). We reconstruct the decay Xi(b)- -->J/psiXi-, with J/psi-->mu+mu-, and Xi--->Lambdapi--->ppi-pi- in pp collisions at square root of s =1.96 TeV. Using 1.3 fb(-1) of data collected by the D0 detector, we observe 15.2 +/- 4.4(stat)(-0.4)(+1.9)(syst) Xi(b)- candidates at a mass of 5.774 +/- 0.011(stat) +/- 0.015(syst) GeV. The significance of the observed signal is 5.5 sigma, equivalent to a probability of 3.3 x 10(-8) of it arising from a background fluctuation. Normalizing to the decay Lambda(b)-->J/psiLambda, we measure the relative rate sigma(Xi(b-) x B(Xi)b})- -->J/psiXi-)/sigma(Lambda(b)) x B(Lambda(b)-->J/psiLambda) = 0.28+/-0.09(stat)(-0.08)(+0.09)(syst).