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Measurement of the First Hadronic Spectral Moment from Semileptonic B Decays

B. Aubert 1 D. Boutigny 1 J.M. Gaillard 1 A. Hicheur 1 Y. Karyotakis 1 J.P. Lees 1 P. Robbe 1 V. Tisserand 1 A. Zghiche 1 A. Palano A. Pompili J.C. Chen N.D. Qi G. Rong P. Wang Y.S. Zhu G. Eigen I. Ofte B. Stugu G.S. Abrams A.W. Borgland A.B. Breon D.N. Brown J. Button-Shafer R.N. Cahn E. Charles M.S. Gill A.V. Gritsan Y. Groysman R.G. Jacobsen R.W. Kadel J. Kadyk L.T. Kerth Yu.G. Kolomensky J.F. Kral Céline Leclerc M.E. Levi G. Lynch L.M. Mir P.J. Oddone T.J. Orimoto M. Pripstein N.A. Roe A. Romosan M.T. Ronan V.G. Shelkov A.V. Telnov W.A. Wenzel T.J. Harrison C.M. Hawkes D.J. Knowles S.W. O'Neale R.C. Penny A.T. Watson N.K. Watson T. Deppermann K. Goetzen H. Koch B. Lewandowski K. Peters H. Schmuecker M. Steinke N.R. Barlow W. Bhimji J.T. Boyd N. Chevalier P.J. Clark W.N. Cottingham C. Mackay F.F. Wilson K. Abe C. Hearty T.S. Mattison J.A. Mckenna D. Thiessen S. Jolly A.K. Mckemey V.E. Blinov A.D. Bukin A.R. Buzykaev V.B. Golubev V.N. Ivanchenko A.A. Korol E.A. Kravchenko A.P. Onuchin S.I. Serednyakov Yu.I. Skovpen A.N. Yushkov D. Best M. Chao D. Kirkby A.J. Lankford M. Mandelkern S. Mcmahon D.P. Stoker C. Buchanan S. Chun H.K. Hadavand E.J. Hill D.B. Macfarlane H. Paar S. Prell S. Rahatlou G. Raven V. Sharma J.W. Berryhill C. Campagnari B. Dahmes P.A. Hart N. Kuznetsova S.L. Levy O. Long M.A. Mazur J.D. Richman W. Verkerke J. Beringer A.M. Eisner M. Grothe C.A. Heusch W.S. Lockman T. Pulliam T. Schalk R.E. Schmitz B.A. Schumm A. Seiden M. Turri W. Walkowiak D.C. Williams M.G. Wilson E. Chen G.P. Dubois-Felsmann A. Dvoretskii D.G. Hitlin F.C. Porter A. Ryd A. Samuel S. Yang S. Jayatilleke G. Mancinelli B.T. Meadows M.D. Sokoloff T. Barillari P. Bloom W.T. Ford U. Nauenberg A. Olivas P. Rankin J. Roy J.G. Smith W.C. van Hoek L. Zhang J.L. Harton T. Hu M. Krishnamurthy A. Soffer W.H. Toki R.J. Wilson J. Zhang D. Altenburg T. Brandt J. Brose T. Colberg M. Dickopp R.S. Dubitzky A. Hauke E. Maly R. Muller-Pfefferkorn S. Otto K.R. Schubert R. Schwierz B. Spaan L. Wilden D. Bernard G.R. Bonneaud F. Brochard J. Cohen-Tanugi S. Ferrag S. t'Jampens C. Thiebaux G. Vasileiadis M. Verderi A. Anjomshoaa R. Bernet A. Khan D. Lavin F. Muheim S. Playfer J.E. Swain J. Tinslay M. Falbo C. Borean C. Bozzi L. Piemontese A. Sarti E. Treadwell F. Anulli R. Baldini-Ferroli A. Calcaterra R. de Sangro D. Falciai G. Finocchiaro P. Patteri I.M. Peruzzi M. Piccolo A. Zallo S. Bagnasco A. Buzzo R. Contri G. Crosetti M. Lo Vetere M. Macri M.R. Monge F.C. Pastore C. Patrignani E. Robutti A. Santroni S. Tosi S. Bailey M. Morii R. Bartoldus G.J. Grenier U. Mallik J. Cochran H.B. Crawley J. Lamsa W.T. Meyer E.I. Rosenberg J. Yi M. Davier G. Grosdidier A. Hocker H.M. Lacker S. Laplace F. Le Diberder V. Lepeltier A.M. Lutz T.C. Petersen Stéphane Plaszczynski M.H. Schune L. Tantot S. Trincaz-Duvoid G. Wormser R.M. Bionta V. Brigljevic D.J. Lange K. van Bibber D.M. Wright A.J. Bevan J.R. Fry E. Gabathuler R. Gamet M. George M. Kay D.J. Payne R.J. Sloane C. Touramanis M.L. Aspinwall D.A. Bowerman P.D. Dauncey U. Egede I. Eschrich G.W. Morton J.A. Nash P. Sanders D. Smith G.P. Taylor J.J. Back G. Bellodi P. Dixon P.F. Harrison R.J.L. Potter H.W. Shorthouse P. Strother P.B. Vidal G. Cowan H.U. Flaecher S. George M.G. Green A. Kurup C.E. Marker T.R. Mcmahon S. Ricciardi F. Salvatore G. Vaitsas M.A. Winter D. Brown C.L. Davis J. Allison R.J. Barlow A.C. Forti F. Jackson G.D. Lafferty A.J. Lyon N. Savvas J.H. Weatherall J.C. Williams A. Farbin A. Jawahery V. Lillard D.A. Roberts J.R. Schieck G. Blaylock C. Dallapiccola K.T. Flood S.S. Hertzbach R. Kofler V.B. Koptchev T.B. Moore H. Staengle S. Willocq B. Brau R. Cowan G. Sciolla F. Taylor R.K. Yamamoto M. Milek P.M. Patel F. Palombo J.M. Bauer L. Cremaldi V. Eschenburg R. Kroeger J. Reidy D.A. Sanders D.J. Summers C. Hast P. Taras H. Nicholson N. Cavallo G. de Nardo F. Fabozzi C. Gatto L. Lista P. Paolucci D. Piccolo C. Sciacca J.M. Losecco J.R.G. Alsmiller T.A. Gabriel J. Brau R. Frey M. Iwasaki C.T. Potter N.B. Sinev D. Strom E. Torrence F. Colecchia A. Dorigo F. Galeazzi M. Margoni M. Morandin M. Posocco M. Rotondo F. Simonetto R. Stroili C. Voci M. Benayoun H. Briand J. Chauveau P. David C. de la Vaissiere L. del Buono O. Hamon P. Leruste J. Ocariz M. Pivk L. Roos J. Stark P.F. Manfredi V. Re V. Speziali L. Gladney Q.H. Guo J. Panetta C. Angelini G. Batignani S. Bettarini M. Bondioli F. Bucci G. Calderini E. Campagna M. Carpinelli F. Forti M.A. Giorgi A. Lusiani G. Marchiori F. Martinez-Vidal M. Morganti N. Neri E. Paoloni M. Rama G. Rizzo F. Sandrelli G. Triggiani J. Walsh M. Haire D. Judd K. Paick L. Turnbull D.E. Wagoner J. Albert N. Danielson P. Elmer C. Lu V. Miftakov J. Olsen S.F. Schaffner A.J.S. Smith A. Tumanov E.W. Varnes F. Bellini G. Cavoto D. del Re R. Faccini F. Ferrarotto F. Ferroni Emilio Leonardi S. Morganti G. Piredda F. Safai Tehrani M. Serra C. Voena S. Christ G. Wagner R. Waldi T. Adye N. de Groot B. Franek N.I. Geddes G.P. Gopal S.M. Xella R. Aleksan S. Emery A. Gaidot P.F. Giraud G. Hamel de Monchenault W. Kozanecki M. Langer G.W. London B. Mayer G. Schott B. Serfass G. Vasseur C. Yeche M. Zito M.V. Purohit A.W. Weidemann F.X. Yumiceva I. Adam D. Aston N. Berger A.M. Boyarski M.R. Convery D.P. Coupal D. Dong J. Dorfan W. Dunwoodie R.C. Field T. Glanzman S.J. Gowdy E. Grauges T. Haas T. Hadig V. Halyo T. Himel T. Hrynova M.E. Huffer W.R. Innes C.P. Jessop M.H. Kelsey P. Kim M.L. Kocian U. Langenegger D.W.G.S. Leith S. Luitz V. Luth H.L. Lynch H. Marsiske S. Menke R. Messner D.R. Muller C.P. O'Grady V.E. Ozcan A. Perazzo M. Perl S. Petrak H. Quinn B.N. Ratcliff S.H. Robertson A. Roodman A.A. Salnikov T. Schietinger R.H. Schindler J. Schwiening G. Simi A. Snyder A. Soha S.M. Spanier J. Stelzer D. Su M.K. Sullivan H.A. Tanaka J. Vavra S.R. Wagner M. Weaver A.J.R. Weinstein W.J. Wisniewski D.H. Wright C.C. Young P.R. Burchat C.H. Cheng T.I. Meyer C. Roat R. Henderson W. Bugg H. Cohn J.M. Izen I. Kitayama X.C. Lou F. Bianchi M. Bona D. Gamb L. Bosisio G. Della Ricca S. Dittongo L. Lanceri P. Poropat L. Vitale G. Vuagnin R.S. Panvini S. Banerjee C.M. Brown D. Fortin P.D. Jackson R. Kowalewski J.M. Roney H.R. Band S. Dasu M. Datta A.M. Eichenbaum H. Hu J.R. Johnson R. Liu F. Di Lodovico A. Mohapatra Y. Pan R. Prepost I.J. Scott S.J. Sekula J.H. von Wimmersperg-Toeller J. Wu S.L. Wu Z. Yu H. Neal
Abstract : A preliminary determination of the first moment of the hadronic mass distribution <(M_X)^2 - bar{m_D}^2> in semileptonic B decays has been obtained as a function of the minimum lepton momentum, ranging from 0.9 to 1.6 GeV/c. The measurement is based on a new technique involving BBbar events in which one fully reconstructed B meson decays hadronically and the recoiling B decays semileptonically. The mass of the hadrons in the semileptonic decay is determined from a kinematic fit to the whole event. For different minimum lepton momenta, the mass distribution is decomposed into contributions from various charm resonant states and a non-resonant contribution, allowing for the determination of the first moment. From these moments the Heavy Quark Effective Theory (HQET) parameters lambda_1 and Lambdabar can be derived. For lepton momenta in the B rest frame above 1.5 GeV/c, we find a first moment that is compatible with existing measurements. However, if we extend the measurement to lower values of lepton momenta, the data can only be described by Operator Product Expansion calculations if we use significantly different values for Lambdabar and lambda_1 than obtained from earlier measurements based on lepton momentum spectra and the photon spectrum in b --> s gamma transitions.
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Submitted on : Tuesday, January 14, 2003 - 1:40:54 PM
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B. Aubert, D. Boutigny, J.M. Gaillard, A. Hicheur, Y. Karyotakis, et al.. Measurement of the First Hadronic Spectral Moment from Semileptonic B Decays. International Conference on High Energy Physics 31 ICHEP 2002, Jul 2002, Amsterdam, Netherlands. pp.1-20. ⟨in2p3-00012414⟩

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