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2008•Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsOpen access

Search for B+→τ+ν decays with hadronic B tags

Bernard Aubert, M. Bóna, D. Boutigny, Y. Karyotakis, J. P. Lees, V. Poireau, X. Prudent, V. Tisserand, Amina Zghiche, J. Garra Ticó, E. Graugés, Luciano Lopez, ANTIMO PALANO, Marco Pappagallo, G. Eigen, B. Stugu, L. Sun, G. S. Abrams, M. Battaglia, D. N. Brown, Janice Button-Shafer, R. N. Cahn, Y. Groysman, R. G. Jacobsen, John A. Kadyk, L. T. Kerth, Yu. G. Kolomensky, G. Kukartsev, D. Lopes Pegna, G. Lynch, L. M. Mir, Toyoko J. Orimoto, I. L. Osipenkov, M. T. Ronan, Kerstin Tackmann, T. Tanabe, W.A. Wenzel, P. del Amo Sanchez, C. M. Hawkes, A. T. Watson, H. Koch, T. Vazquez Schroeder, D. Walker, D. J. Asgeirsson, Tülay Çuhadar-Dönszelmann, B. G. Fulsom, Christopher Hearty, T. S. Mattison, J. A. McKenna, Matthew J. Barrett, A. Khan, Muzammal Saleem, L. Teodorescu, V.E. Blinov, A. D. Bukin, В. П. Дружинин, V. B. Golubev, A. P. Onuchin, S. I. Serednyakov, Yu. I. Skovpen, E. P. Solodov, Korneliy Yu. Todyshev, M. Bondioli, S. Curry, I. Eschrich, D. Kirkby, A. J. Lankford, P. Lund, M. Mandelkern, E. C. Martin, D. P. Stoker, S. Abachi, C. Charlotte Buchanan, S. D. Foulkes, J. William Gary, F. Liu, O. Long, B. C. Shen, G. M. Vitug, L. Zhang, H. P. Paar, S. Rahatlou, V. Sharma, J. Berryhill, C. Campagnari, António Manuel Trigueiros da Silva Cunha, B. Dahmes, T. M. Hong, D. Kovalskyi, J. D. Richman, T. W. Beck, A. M. Eisner, C. J. Flacco, C.A. Heusch, J. Kroseberg, W. S. Lockman, Terry LeRoy Schalk, B. A. Schumm, A. Seiden, M. G. Wilson, L. O. Winstrom, E. Chen, C. H. Cheng, F. Fang, David G. Hitlin, I. Narsky, T. Piatenko, Frank C. Porter, R. Andreassen, Giampiero Mancinelli, B. Meadows, K. Mishra, M. D. Sokoloff, F. Blanc, P. C. Bloom, S. Chen, W. T. Ford, J. F. Hirschauer, Arik Kreisel, Martin Nagel, U. Nauenberg, A. Olivas, J. G. Smith, K. A. Ulmer, S. R. Wagner, J. Zhang, A. M. Gabareen, Abner Soffer, W. H. Toki, R. J. Wilson, F. Winklmeier, D. D. Altenburg, E. Feltresi, A. Hauke, H. Jasper, J. Merkel, Andreas Petzold, B. Spaan, K. Wacker, Verena Klose, M. J. Kobel, H. M. Lacker, W. F. Mader, R. Nogowski, J. G. Schubert, K. R. Schubert, R. Schwierz, J. E. Sundermann, A. Volk, D. Bernard, G. R. Bonneaud, E. Latour, V. Lombardo, Ch. Thiebaux, M. Verderi, P. J. Clark, W. Gradl, F. Muheim, S. Playfer, A. I. Robertson, J. E. Watson, Y. Xie, M. Andreotti, D. Bettoni, C. Bozzi, R. Calabrese, A. Cecchi, G. Cibinetto, P. Franchini, E. Luppi, Matteo Negrini, Antonio Petrella, L. Piemontese, Elisabetta Prencipe, Valentina Santoro, F. Anulli, R. Baldini-Ferroli, Alessandro Calcaterra, Riccardo de Sangro, G. Finocchiaro, S. Pacetti, P. Patteri, I. M. Peruzzi, Marcello Piccolo, M. Rama, A. Zallo, A. Buzzo, R. Contri, M. Lo Vetere, M. M. Macri, M. R. Monge, S. Passaggio, Claudia Patrignani, E. Robutti, A. Santroni, S. Tosi, K. S. Chaisanguanthum, M.M. Morii, J. Wu, R. S. Dubitzky, J. Marks, S. Schenk, U. Uwer, D. J. Bard, P. D. Dauncey, R. L. Flack, J. Nash, J. G. Panduro Vazquez, M. J. Tibbetts, P. K. Behera, Xuedong Chai, M. Charles, Usha Mallik, J. Cochran, H. B. Crawley, L. Y. Dong, V. Eyges, W. T. Meyer, S. Prell, E. I. Rosenberg, A. E. Rubin, Y. Y. Gao, Andrei V. Gritsan, Z. J. Guo, C. K. Lae, A. G. Denig, M. Fritsch, G. Schott, N. Arnaud, J. Béquilleux, A. D’Orazio, M. Davier, G. Grosdidier, A. Höcker, Vincent Lepeltier, F. Le Diberder, A. M. Lutz, Sandrine Pruvot, S. Rodier, Patrick Roudeau, M. H. Schune, J. Serrano, V. Sordini, A. Stocchi, W. F. Wang, Guy Henri Maurice Wormser, David J Lange, Douglas M. Wright, I. Bingham, James P. Burke, C. A. Chavez, J. R. Fry, E. Gabathuler, R. Gamet, D. Hutchcroft, D. J. Payne, K. C. Schofield, Christos Touramanis, Adrian John Bevan, K. A. George, Francesca Di Lodovico, R. Sacco, G. Cowan, Henning U Flaecher, D. A. Hopkins, S. Paramesvaran, F. Salvatore, A. C. Wren, D. N. Brown, C. L. Davis, J. Allison, D. Bailey, N. Barlow, Roger John Barlow, Y. M. Chia, C. L. Edgar, George D. Lafferty, Thomas J. West, J. I. Yi, J. Anderson, C. Chen, Abolhassan Jawahery, D. A. Roberts, Gabriele Simi, J. M. Tuggle, G. Blaylock, Carlo Dallapiccola, S. S. Hertzbach, X. Li, T. B. Moore, E. Salvati, S. Saremi, R. Cowan, D. Dujmić, P.H. Fisher, Karsten Köneke, G. Sciolla, M. Spitznagel, F. E. Taylor, R. K. Yamamoto, Mengfei Zhao, Y. H. Zheng, S. E. Mclachlin, P. M. Patel, Steven H Robertson, A. Lazzaro, F. Palombo, J. M. Bauer, L. Cremaldi, V. Eschenburg, R. Godang, R. S. Kroeger, D. A. Sanders, D. J. Summers, H. W. Zhao, S. Brunet, D. Côté, M. Simard, P. Taras, F. B. Viaud, Howard W. Nicholson, G. De Nardo, F. Fabozzi, L. Lista, D. Monorchio, G. Onorato, C. Sciacca, M. A. Baak, Gerhard Raven, H. L. Snoek, Colin P Jessop, K. J. Knoepfel, John M. LoSecco, G. Benelli, L. A. Corwin, K. Honscheid, H. Kagan, R. Kass, James P. Morris, A. M. Rahimi, J. J. Regensburger, S. J. Sekula, Q. K. Wong, N. L. Blount, J. Brau, R. E. Frey, O. Igonkina, J. Kolb, M. Lu, R. Rahmat, N. B. Sinev, Danielle Strom, J. Strube, E. Torrence, N. Gagliardi, Alessandro Gaz, M. Margoni, M. Morandin, A. Pompili, M. Posocco, M. Rotondo, F. Simonetto, Roberto Stroili, C. Voci, E. Ben-Haim, H. Briand, G. Calderini, J. Chauveau, P. David, L. Del Buono, Ch. de la Vaissière, O. Hamon, Ph. Leruste, J. Malclès, J. Ocariz, A. Pérez, J. Prendki, L. Gladney, M. Biasini, R. Covarelli, E. Manoni, Corrado Italo Angelini, G. Batignani, S. Bettarini, M. Carpinelli, R. Cenci, A. Cervelli, F. Forti, M. A. Giorgi, A. Lusiani, G. Marchiori, M. Mazur, M. Morganti, N. Néri, Eugenio Paoloni, Giuliana Rizzo, J. Walsh, J. Biesiada, P. Elmer, Y. P. Lau, C. Lü, Joy Olsen, A. J. S. Smith, A. V. Telnov, E. Baracchini, Fabio Bellini, G. Cavoto, D. Del Re, E. Di Marco, R. Faccini, F. Ferrarotto, F. Ferroni, M. Gaspero, P. Jackson, L. Li Gioi, M. A. Mazzoni, S. Morganti, G. Piredda, F. Polci, F. Renga, Cecilia Voena, Marcus Ebert, T. Hartmann, Henning Schröder, R. Waldi, T. Adye, Gioele Castelli, B.J. Franek, E. O. Olaiya, W. Roethel, F. F. Wilson, S. Emery, M. Escalier, A. Gaidot, S. F. Ganzhur, G. Hamel de Monchenault, W. Kozanecki, G. Vasseur, Ch. Yèche, M. Zito, X. R. Chen, Haibo Liu, W. Park, M. V. Purohit, R. M. White, R. J. Wilson, M. T. Allen, D. A. Aston, R. Bartoldus, P. Bechtle, R. Claus, J. P. Coleman, M. R. Convery, J. Dingfelder, J. Dorfan, G. P. Dubois-Felsmann, W. Dunwoodie, R. C. Field, T. Glanzman, S. J. Gowdy, M. T. Graham, P. Grenier, Carsten HAST, W. R. Innes, Jochen Kaminski, M. Kelsey, H. Kim, P. Kim, M. L. Kocian, D. W. G. S. Leith, S. Li, S. Luitz, V. Lüth, H. L. Lynch, David B MacFarlane, H. Marsiske, R. Messner, D. R. Müller, C. P. O’Grady, I. Ofte, A. Perazzo, M. Perl, T. Pulliam, B. N. Ratcliff, Aaron J. Roodman, A. A. Salnikov, R. H. Schindler, Jochen Schwiening, Alana Snyder, D. Su, M. K. Sullivan, Ken Suzuki, S. K. Swain, Jay M. Thompson, Jaroslav Va'vra, A. P. Wagner, M. Weaver, W. J. Wisniewski, M. Wittgen, D. H. Wright, A. K. Yarritu, Kh’ng Xin Yi, C. C. Young, V. Ziegler, P. R. Burchat, A. J. Edwards, S. Majewski, T. S. Miyashita, B. A. Petersen, Leif H Wilden, S. Ahmed, M. S. Alam, R. Bula, J. Ernst, Vibhore Jain, B. Pan, M. A. Saeed, F. R. Wappler, S. B. Zain, M. Krishnamurthy, S. M. Spanier, R. Eckmann, Jack L. Ritchie, A. M. Ruland, C. J. Schilling, R. F. Schwitters, J. M. Izen, X. C. Lou, S. Ye, F. Bianchi, F. Gallo, D. Gamba, M. Pelliccioni, M. Bomben, L. Bosisio, C. Cartaro, F. Cossutti, G. Della Ricca, L. Lanceri, Lorenzo G. Vitale, V. Azzolini, N. López-March, F. Martínez-Vidal, D. A. Milanés, A. Oyanguren, Justin E Albert, Sw. Banerjee, B. Bhuyan, K. Hamano, R. Kowalewski, I. M. Nugent, J. Michael Roney, Randall J. Sobie, P. F. Harrison, J. Ilić, T. Latham, G. B. Mohanty, H. R. Band, X. Chen, S. Dasu, K. T. Flood, J. J. Hollar, P. E. Kutter, Y. Pan, M. Pierini, R. Prepost, Sau Lan Wu, H. Neal

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Abstract

We present a search for the decay ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ using $383\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector at the SLAC PEP-II $B$ Factory. We select a sample of events with one completely reconstructed tag $B$ in a hadronic decay mode (${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)0}{X}^{\ensuremath{-}}$), and examine the rest of the event to search for a ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ decay. We identify the $\ensuremath{\tau}$ lepton in the following modes: ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\overline{\ensuremath{\nu}}$, and ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}\overline{\ensuremath{\nu}}$. We find a $2.2\ensuremath{\sigma}$ excess in data and measure a branching fraction of $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu})=({1.8}_{\ensuremath{-}0.8}^{+0.9}(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{bkg}.\text{ }\mathrm{syst}.)\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{other}\text{ }\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. We calculate the product of the $B$ meson decay constant ${f}_{B}$ and $|{V}_{ub}|$ to be ${f}_{B}\ifmmode\cdot\else\textperiodcentered\fi{}|{V}_{ub}|=({10.1}_{\ensuremath{-}2.5}^{+2.3}(\mathrm{stat}.{)}_{\ensuremath{-}1.5}^{+1.2}(\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}\text{ }\text{ }\mathrm{GeV}$.

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We present a search for the decay ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ using $383\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector at the SLAC PEP-II $B$ Factory. We select a sample of events with one completely reconstructed tag $B$ in a hadronic decay mode (${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)0}{X}^{\ensuremath{-}}$), and examine the rest of the event to search for a ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ decay. We identify the $\ensuremath{\tau}$ lepton in the following modes: ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\overline{\ensuremath{\nu}}$, and ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}\overline{\ensuremath{\nu}}$. We find a $2.2\ensuremath{\sigma}$ excess in data and measure a branching fraction of $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu})=({1.8}_{\ensuremath{-}0.8}^{+0.9}(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{bkg}.\text{ }\mathrm{syst}.)\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{other}\text{ }\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. We calculate the product of the $B$ meson decay constant ${f}_{B}$ and $|{V}_{ub}|$ to be ${f}_{B}\ifmmode\cdot\else\textperiodcentered\fi{}|{V}_{ub}|=({10.1}_{\ensuremath{-}2.5}^{+2.3}(\mathrm{stat}.{)}_{\ensuremath{-}1.5}^{+1.2}(\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}\text{ }\text{ }\mathrm{GeV}$.

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Available abstract

We present a search for the decay ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ using $383\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ pairs collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the BABAR detector at the SLAC PEP-II $B$ Factory. We select a sample of events with one completely reconstructed tag $B$ in a hadronic decay mode (${B}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{(*)0}{X}^{\ensuremath{-}}$), and examine the rest of the event to search for a ${B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu}$ decay. We identify the $\ensuremath{\tau}$ lepton in the following modes: ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{e}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}\ensuremath{\nu}\overline{\ensuremath{\nu}}$, ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}\overline{\ensuremath{\nu}}$, and ${\ensuremath{\tau}}^{+}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}\overline{\ensuremath{\nu}}$. We find a $2.2\ensuremath{\sigma}$ excess in data and measure a branching fraction of $\mathcal{B}({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{+}\ensuremath{\nu})=({1.8}_{\ensuremath{-}0.8}^{+0.9}(\mathrm{stat}.)\ifmmode\pm\else\textpm\fi{}0.4(\mathrm{bkg}.\text{ }\mathrm{syst}.)\ifmmode\pm\else\textpm\fi{}0.2(\mathrm{other}\text{ }\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. We calculate the product of the $B$ meson decay constant ${f}_{B}$ and $|{V}_{ub}|$ to be ${f}_{B}\ifmmode\cdot\else\textperiodcentered\fi{}|{V}_{ub}|=({10.1}_{\ensuremath{-}2.5}^{+2.3}(\mathrm{stat}.{)}_{\ensuremath{-}1.5}^{+1.2}(\mathrm{syst}.))\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}\text{ }\text{ }\mathrm{GeV}$.

Key concepts: Physics, Particle physics, Hadron, Branching fraction, Lepton, Electron–positron annihilation, Crystallography, Nuclear physics

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