对奇异重子Ξb−的直接观测。
Direct observation of the strange b baryon Xib-.
作者信息
Abazov V M, Abbott B, Abolins M, Acharya B S, Adams M, Adams T, Aguilo E, Ahn S H, Ahsan M, Alexeev G D, Alkhazov G, Alton A, Alverson G, Alves G A, Anastasoaie M, Ancu L S, Andeen T, Anderson S, Andrieu B, Anzelc M S, Arnoud Y, Arov M, Arthaud M, Askew A, Asman B, Assis Jesus A C S, Atramentov O, Autermann C, Avila C, Ay C, Badaud F, Baden A, Bagby L, Baldin B, Bandurin D V, Banerjee S, Banerjee P, Barberis E, Barfuss A-F, Bargassa P, Baringer P, Barreto J, Bartlett J F, Bassler U, Bauer D, Beale S, Bean A, Begalli M, Begel M, Belanger-Champagne C, Bellantoni L, Bellavance A, Benitez J A, Beri S B, Bernardi G, Bernhard R, Berntzon L, Bertram I, Besançon M, Beuselinck R, Bezzubov V A, Bhat P C, Bhatnagar V, Biscarat C, Blazey G, Blekman F, Blessing S, Bloch D, Bloom K, Boehnlein A, Boline D, Bolton T A, Borissov G, Bos K, Bose T, Brandt A, Brock R, Brooijmans G, Bross A, Brown D, Buchanan N J, Buchholz D, Buehler M, Buescher V, Burdin S, Burke S, Burnett T H, Buszello C P, Butler J M, Calfayan P, Calvet S, Cammin J, Caron S, Carvalho W, Casey B C K, Cason N M, Castilla-Valdez H, Chakrabarti S, Chakraborty D, Chan K M, Chan K, Chandra A, Charles F, Cheu E, Chevallier F, Cho D K, Choi S, Choudhary B, Christofek L, Christoudias T, Cihangir S, Claes D, Clément C, Clément B, Coadou Y, Cooke M, Cooper W E, Corcoran M, Couderc F, Cousinou M-C, Crépé-Renaudin S, Cutts D, Cwiok M, da Motta H, Das A, Davies G, De K, de Jong S J, de Jong P, De La Cruz-Burelo E, De Oliveira Martins C, Degenhardt J D, Déliot F, Demarteau M, Demina R, Denisov D, Denisov S P, Desai S, Diehl H T, Diesburg M, Dominguez A, Dong H, Dudko L V, Duflot L, Dugad S R, Duggan D, Duperrin A, Dyer J, Dyshkant A, Eads M, Edmunds D, Ellison J, Elvira V D, Enari Y, Eno S, Ermolov P, Evans H, Evdokimov A, Evdokimov V N, Ferapontov A V, Ferbel T, Fiedler F, Filthaut F, Fisher W, Fisk H E, Ford M, Fortner M, Fox H, Fu S, Fuess S, Gadfort T, Galea C F, Gallas E, Galyaev E, Garcia C, Garcia-Bellido A, Gavrilov V, Gay P, Geist W, Gelé D, Gerber C E, Gershtein Y, Gillberg D, Ginther G, Gollub N, Gómez B, Goussiou A, Grannis P D, Greenlee H, Greenwood Z D, Gregores E M, Grenier G, Gris Ph, Grivaz J-F, Grohsjean A, Grünendahl S, Grünewald M W, Guo J, Guo F, Gutierrez P, Gutierrez G, Haas A, Hadley N J, Haefner P, Hagopian S, Haley J, Hall I, Hall R E, Han L, Hanagaki K, Hansson P, Harder K, Harel A, Harrington R, Hauptman J M, Hauser R, Hays J, Hebbeker T, Hedin D, Hegeman J G, Heinmiller J M, Heinson A P, Heintz U, Hensel C, Herner K, Hesketh G, Hildreth M D, Hirosky R, Hobbs J D, Hoeneisen B, Hoeth H, Hohlfeld M, Hong S J, Hooper R, Hossain S, Houben P, Hu Y, Hubacek Z, Hynek V, Iashvili I, Illingworth R, Ito A S, Jabeen S, Jaffré M, Jain S, Jakobs K, Jarvis C, Jesik R, Johns K, Johnson C, Johnson M, Jonckheere A, Jonsson P, Juste A, Käfer D, Kahn S, Kajfasz E, Kalinin A M, Kalk J R, Kalk J M, Kappler S, Karmanov D, Kasper J, Kasper P, Katsanos I, Kau D, Kaur R, Kaushik V, Kehoe R, Kermiche S, Khalatyan N, Khanov A, Kharchilava A, Kharzheev Y M, Khatidze D, Kim H, Kim T J, Kirby M H, Kirsch M, Klima B, Kohli J M, Konrath J-P, Kopal M, Korablev V M, Kothari B, Kozelov A V, Krop D, Kryemadhi A, Kuhl T, Kumar A, Kunori S, Kupco A, Kurca T, Kvita J, Lacroix F, Lam D, Lammers S, Landsberg G, Lazoflores J, Lebrun P, Lee W M, Leflat A, Lehner F, Lellouch J, Lesne V, Leveque J, Lewis P, Li J, Li Q Z, Li L, Lietti S M, Lima J G R, Lincoln D, Linnemann J, Lipaev V V, Lipton R, Liu Y, Liu Z, Lobo L, Lobodenko A, Lokajicek M, Lounis A, Love P, Lubatti H J, Lyon A L, Maciel A K A, Mackin D, Madaras R J, Mättig P, Magass C, Magerkurth A, Makovec N, Mal P K, Malbouisson H B, Malik S, Malyshev V L, Mao H S, Maravin Y, Martin B, McCarthy R, Melnitchouk A, Mendes A, Mendoza L, Mercadante P G, Merekov Y P, Merkin M, Merritt K W, Meyer J, Meyer A, Michaut M, Millet T, Mitrevski J, Molina J, Mommsen R K, Mondal N K, Moore R W, Moulik T, Muanza G S, Mulders M, Mulhearn M, Mundal O, Mundim L, Nagy E, Naimuddin M, Narain M, Naumann N A, Neal H A, Negret J P, Neustroev P, Nilsen H, Nomerotski A, Novaes S F, Nunnemann T, O'Dell V, O'Neil D C, Obrant G, Ochando C, Onoprienko D, Oshima N, Osta J, Otec R, Otero y Garzón G J, Owen M, Padley P, Pangilinan M, Panov G, Parashar N, Park S-J, Park S K, Parsons J, Partridge R, Parua N, Patwa A, Pawloski G, Penning B, Perea P M, Peters K, Peters Y, Pétroff P, Petteni M, Piegaia R, Piper J, Pleier M-A, Podesta-Lerma P L M, Podstavkov V M, Pogorelov Y, Pol M-E, Polozov P, Pompos A, Pope B G, Popov A V, Potter C, Prado da Silva W L, Prosper H B, Protopopescu S, Qian J, Quadt A, Quinn B, Rakitine A, Rangel M S, Rani K J, Ranjan K, Ratoff P N, Renkel P, Reucroft S, Rich P, Rijssenbeek M, Ripp-Baudot I, Rizatdinova F, Robinson S, Rodrigues R F, Royon C, Rozhdestvenski A, Rubinov P, Ruchti R, Safronov G, Sajot G, Sánchez-Hernández A, Sanders M P, Santoro A, Savage G, Sawyer L, Scanlon T, Schaile D, Schamberger R D, Scheglov Y, Schellman H, Schieferdecker P, Schliephake T, Schmitt C, Schwanenberger C, Schwartzman A, Schwienhorst R, Sekaric J, Sengupta S, Severini H, Shabalina E, Shamim M, Shary V, Shchukin A A, Shivpuri R K, Shpakov D, Siccardi V, Simak V, Sirotenko V, Skubic P, Slattery P, Smirnov D, Smith R P, Snow J, Snow G R, Snyder S, Söldner-Rembold S, Sonnenschein L, Sopczak A, Sosebee M, Soustruznik K, Souza M, Spurlock B, Stark J, Steele J, Stolin V, Stone A, Stoyanova D A, Strandberg J, Strandberg S, Strang M A, Strauss M, Strauss E, Ströhmer R, Strom D, Strovink M, Stutte L, Sumowidagdo S, Svoisky P, Sznajder A, Talby M, Tamburello P, Tanasijczuk A, Taylor W, Telford P, Temple J, Tiller B, Tissandier F, Titov M, Tokmenin V V, Tomoto M, Toole T, Torchiani I, Trefzger T, Tsybychev D, Tuchming B, Tully C, Tuts P M, Unalan R, Uvarov S, Uvarov L, Uzunyan S, Vachon B, van den Berg P J, van Eijk B, Van Kooten R, van Leeuwen W M, Varelas N, Varnes E W, Vartapetian A, Vasilyev I A, Vaupel M, Verdier P, Vertogradov L S, Vertogradova Y, Verzocchi M, Villeneuve-Seguier F, Vint P, Vokac P, Von Toerne E, Voutilainen M, Vreeswijk M, Wagner R, Wahl H D, Wang L, Wang M H L S, Warchol J, Watts G, Wayne M, Weber M, Weber G, Weerts H, Wenger A, Wermes N, Wetstein M, White A, Wicke D, Wilson G W, Wimpenny S J, Wobisch M, Wood D R, Wyatt T R, Xie Y, Yacoob S, Yamada R, Yan M, Yasuda T, Yatsunenko Y A, Yip K, Yoo H D, Youn S W, Yu J, Yu C, Yurkewicz A, Zatserklyaniy A, Zeitnitz C, Zhang D, Zhao T, Zhou B, Zhu J, Zielinski M, Zieminska D, Zieminski A, Zivkovic L, Zutshi V, Zverev E G
机构信息
Joint Institute for Nuclear Research, Dubna, Russia.
出版信息
Phys Rev Lett. 2007 Aug 3;99(5):052001. doi: 10.1103/PhysRevLett.99.052001.
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).
我们报告了对奇异重子Ξb-（Ξb+）的首次直接观测。我们在质心能量√s = 1.96 TeV的质子-质子碰撞中，通过重建衰变Ξb-→J/ψΞ-，其中J/ψ→μ+μ-，以及Ξ-→Λπ-→pπ-π-来进行观测。利用D0探测器收集的1.3 fb-1数据，我们在质量为5.774±0.011（统计）±0.015（系统）GeV处观测到15.2±4.4（统计）-0.4+1.9（系统）个Ξb-候选事例。观测信号的显著性为5.5σ，相当于由背景涨落产生该信号的概率为3.3×10-8。以衰变Λb→J/ψΛ进行归一化，我们测量相对速率σ（Ξb-×B（Ξb-）→J/ψΞ-）/σ（Λb）×B（Λb→J/ψΛ） = 0.28±0.09（统计）-0.08+0.09（系统）。
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