稀有衰变B→K*l⁺l⁻的证据及B→Kl⁺l⁻分支比的测量。
Evidence for the rare decay B-->K*l+l- and measurement of the B-->Kl+l- branching fraction.
作者信息
Aubert B, Barate R, Boutigny D, Gaillard J-M, Hicheur A, Karyotakis Y, Lees J P, Robbe P, Tisserand V, Zghiche A, Palano A, Pompili A, Chen J C, Qi N D, Rong G, Wang P, Zhu Y S, Eigen G, Ofte I, Stugu B, Abrams G S, Borgland A W, Breon A B, Brown D N, Button-Shafer J, Cahn R N, Charles E, Day C T, Gill M S, Gritsan A V, Groysman Y, Jacobsen R G, Kadel R W, Kadyk J, Kerth L T, Kolomensky Yu G, Kral J F, Kukartsev G, LeClerc C, Levi M E, Lynch G, Mir L M, Oddone P J, Orimoto T J, Pripstein M, Roe N A, Romosan A, Ronan M T, Shelkov V G, Telnov A V, Wenzel W A, Ford K, Harrison T J, Hawkes C M, Knowles D J, Morgan S E, Penny R C, Watson A T, Watson N K, Goetzen K, Held T, Koch H, Lewandowski B, Pelizaeus M, Peters K, Schmuecker H, Steinke M, Barlow N R, Boyd J T, Chevalier N, Cottingham W N, Kelly M P, Latham T E, Mackay C, Wilson F F, Abe K, Cuhadar-Donszelmann T, Hearty C, Mattison T S, McKenna J A, Thiessen D, Kyberd P, McKemey A K, Blinov V E, Bukin A D, Golubev V B, Ivanchenko V N, Kravchenko E A, Onuchin A P, Serednyakov S I, Skovpen Yu I, Solodov E P, Yushkov A N, Best D, Bruinsma M, Chao M, Kirkby D, Lankford A J, Mandelkern M, Mommsen R K, Roethel W, Stoker D P, Buchanan C, Hartfiel B L, Shen B C, del Re D, Hadavand H K, Hill E J, MacFarlane D B, Paar H P, Rahatlou Sh, Sharma V, Berryhill J W, Campagnari C, Dahmes B, Kuznetsova N, Levy S L, Long O, Lu A, Mazur M A, Richman J D, Verkerke W, Beck T W, Beringer J, Eisner A M, Heusch C A, Lockman W S, Schalk T, Schmitz R E, Schumm B A, Seiden A, Turri M, Walkowiak W, Williams D C, Wilson M G, Albert J, Chen E, Dubois-Felsmann G P, Dvoretskii A, Hitlin D G, Narsky I, Porter F C, Ryd A, Samuel A, Yang S, Jayatilleke S, Mancinelli G, Meadows B T, Sokoloff M D, Abe T, Blanc F, Bloom P, Chen S, Clark P J, Ford W T, Nauenberg U, Olivas A, Rankin P, Roy J, Smith J G, van Hoek W C, Zhang L, Harton J L, Hu T, Soffer A, Toki W H, Wilson R J, Zhang J, Altenburg D, Brandt T, Brose J, Colberg T, Dickopp M, Dubitzky R S, Hauke A, Lacker H M, Maly E, Müller-Pfefferkorn R, Nogowski R, Otto S, Schubert J, Schubert K R, Schwierz R, Spaan B, Wilden L, Bernard D, Bonneaud G R, Brochard F, Cohen-Tanugi J, Grenier P, Thiebaux Ch, Vasileiadis G, Verderi M, Khan A, Lavin D, Muheim F, Playfer S, Swain J E, Andreotti M, Azzolini V, Bettoni D, Bozzi C, Calabrese R, Cibinetto G, Luppi E, Negrini M, Piemontese L, Sarti A, Treadwell E, Anulli F, Baldini-Ferroli R, Biasini M, Calcaterra A, de Sangro R, Falciai D, Finocchiaro G, Patteri P, Peruzzi I M, Piccolo M, Pioppi M, Zallo A, Buzzo A, Capra R, Contri R, Crosetti G, Lo Vetere M, Macri M, Monge M R, Passaggio S, Patrignani C, Robutti E, Santroni A, Tosi S, Bailey S, Morii M, Won E, Bhimji W, Bowerman D A, Dauncey P D, Egede U, Eschrich I, Gaillard J R, Morton G W, Nash J A, Sanders P, Taylor G P, Grenier G J, Lee S-J, Mallik U, Cochran J, Crawley H B, Lamsa J, Meyer W T, Prell S, Rosenberg E I, Yi J, Davier M, Grosdidier G, Höcker A, Laplace S, Le Diberder F, Lepeltier V, Lutz A M, Petersen T C, Plaszczynski S, Schune M H, Tantot L, Wormser G, Brigljević V, Cheng C H, Lange D J, Wright D M, Bevan A J, Coleman J P, Fry J R, Gabathuler E, Gamet R, Kay M, Parry R J, Payne D J, Sloane R J, Touramanis C, Back J J, Harrison P F, Shorthouse H W, Strother P, Vidal P B, Brown C L, Cowan G, Flack R L, Flaecher H U, George S, Green M G, Kurup A, Marker C E, McMahon T R, Ricciardi S, Salvatore F, Vaitsas G, Winter M A, Brown D, Davis C L, Allison J, Barlow R J, Forti A C, Hart P A, Hodgkinson M C, Jackson F, Lafferty G D, Lyon A J, Weatherall J H, Williams J C, Farbin A, Jawahery A, Kovalskyi D, Lae C K, Lillard V, Roberts D A, Blaylock G, Dallapiccola C, Flood K T, Hertzbach S S, Kofler R, Koptchev V B, Moore T B, Saremi S, Staengle H, Willocq S, Cowan R, Sciolla G, Taylor F, Yamamoto R K, Mangeol D J J, Patel P M, Lazzaro A, Palombo F, Bauer J M, Cremaldi L, Eschenburg V, Godang R, Kroeger R, Reidy J, Sanders D A, Summers D J, Zhao H W, Brunet S, Cote-Ahern D, Hast C, Taras P, Nicholson H, Cartaro C, Cavallo N, De Nardo G, Fabozzi F, Gatto C, Lista L, Paolucci P, Piccolo D, Sciacca C, Baak M A, Raven G, LoSecco J M, Gabriel T A, Brau B, Gan K K, Honscheid K, Hufnagel D, Kagan H, Kass R, Pulliam T, Wong Q K, Brau J, Frey R, Potter C T, Sinev N B, Strom D, Torrence E, Colecchia F, Dorigo A, Galeazzi F, Margoni M, Morandin M, Posocco M, Rotondo M, Simonetto F, Stroili R, Tiozzo G, Voci C, Benayoun M, Briand H, Chauveau J, David P, de la Vaissière Ch, Del Buono L, Hamon O, John M J J, Leruste Ph, Ocariz J, Pivk M, Roos L, Stark J, T'Jampens S, Therin G, Manfredi P F, Re V, Behera P K, Gladney L, Guo Q H, Panetta J, Angelini C, Batignani G, Bettarini S, Bondioli M, Bucci F, Calderini G, Carpinelli M, Del Gamba V, Forti F, Giorgi M A, Lusiani A, Marchiori G, Martinez-Vidal F, Morganti M, Neri N, Paoloni E, Rama M, Rizzo G, Sandrelli F, Walsh J, Haire M, Judd D, Paick K, Wagoner D E, Danielson N, Elmer P, Lu C, Miftakov V, Olsen J, Smith A J S, Tanaka H A, Varnes E W, Bellini F, Cavoto G, Faccini R, Ferrarotto F, Ferroni F, Gaspero M, Mazzoni M A, Morganti S, Pierini M, Piredda G, Safai Tehrani F, Voena C, Christ S, Wagner G, Waldi R, Adye T, De Groot N, Franek B, Geddes N I, Gopal G P, Olaiya E O, Xella S M, Aleksan R, Emery S, Gaidot A, Ganzhur S F, Giraud P-F, Hamel de Monchenault G, Kozanecki W, Langer M, Legendre M, London G W, Mayer B, Schott G, Vasseur G, Yeche Ch, Zito M, Purohit M V, Weidemann A W, Yumiceva F X, Aston D, Bartoldus R, Berger N, Boyarski A M, Buchmueller O L, Convery M R, Coupal D P, Dong D, Dorfan J, Dujmic D, Dunwoodie W, Field R C, Glanzman T, Gowdy S J, Grauges-Pous E, Hadig T, Halyo V, Hryn'ova T, Innes W R, Jessop C P, Kelsey M H, Kim P, Kocian M L, Langenegger U, Leith D W G S, Luitz S, Luth V, Lynch H L, Marsiske H, Messner R, Muller D R, O'Grady C P, Ozcan V E, Perazzo A, Perl M, Petrak S, Ratcliff B N, Robertson S H, Roodman A, Salnikov A A, Schindler R H, Schwiening J, Simi G, Snyder A, Soha A, Stelzer J, Su D, Sullivan M K, Va'vra J, Wagner S R, Weaver M, Weinstein A J R, Wisniewski W J, Wright D H, Young C C, Burchat P R, Edwards A J, Meyer T I, Petersen B A, Roat C, Ahmed S, Alam M S, Ernst J A, Saleem M, Wappler F R, Bugg W, Krishnamurthy M, Spanier S M, Eckmann R, Kim H, Ritchie J L, Schwitters R F, Izen J M, Kitayama I, Lou X C, Ye S, Bianchi F, Bona M, Gallo F, Gamba D, Borean C, Bosisio L, Della Ricca G, Dittongo S, Grancagnolo S, Lanceri L, Poropat P, Vitale L, Vuagnin G, Panvini R S, Banerjee Sw, Brown C M, Fortin D, Jackson P D, Kowalewski R, Roney J M, Band H R, Dasu S, Datta M, Eichenbaum A M, Johnson J R, Kutter P E, Li H, Liu R, Lodovico F Di, Mihalyi A, Mohapatra A K, Pan Y, Prepost R, Sekula S J, von Wimmersperg-Toeller J H, Wu J, Wu S L, Yu Z, Neal H
机构信息
Laboratoire de Physique des Particules, F-74941 Annecy-le-Vieux, France.
出版信息
Phys Rev Lett. 2003 Nov 28;91(22):221802. doi: 10.1103/PhysRevLett.91.221802. Epub 2003 Nov 25.
We present evidence for the flavor-changing neutral current decay B-->Kl+l- and a measurement of the branching fraction for the related process B-->K l+l-, where l+l- is either an epsilon+epsilon- or a mu+mu- pair. These decays are highly suppressed in the standard model, and they are sensitive to contributions from new particles in the intermediate state. The data sample comprises 123 x 10(6) Upsilon(4S)-->B(-)B decays collected with the BABAR detector at the SLAC PEP-II epsilon+epsilon- storage ring. Averaging over K() isospin and lepton flavor, we obtain the branching fractions B(B-->Kl+l-)=(0.65(+0.14)(-0.13)+/-0.04)x10(-6) and B(B-->Kl+l-)=(0.88(+0.33)(-0.29)+/-0.10)x10(-6), where the uncertainties are statistical and systematic, respectively. The significance of the B-->Kl+l- signal is over 8sigma, while for B-->Kl+l- it is 3.3sigma.
我们给出了味改变中性流衰变B→Kl+l-的证据，并对相关过程B→Kl+l-的分支比进行了测量，其中l+l-为ε+ε-或μ+μ-对。这些衰变在标准模型中受到高度抑制，并且对中间态新粒子的贡献很敏感。数据样本包括在SLAC PEP-II正负电子对撞机上用BABAR探测器收集的123×10⁶个Υ(4S)→B⁻B衰变事例。对K()同位旋和轻子味进行平均，我们得到分支比B(B→Kl+l-)=(0.65(+0.14)(-0.13)±0.04)×10⁻⁶和B(B→Kl+l-)=(0.88(+0.33)(-0.29)±0.10)×10⁻⁶，其中不确定性分别为统计不确定性和系统不确定性。B→Kl+l-信号的显著性超过8σ，而B→Kl+l-的显著性为3.3σ。
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