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Precision Measurement of the Ratio B(Υ(3S) → τ⁺τ⁻)/B(Υ(3S) → μ⁺μ⁻)

Lees, J. P. and Poireau, V. and Tisserand, V. and Grauges, E. and Palano, A. and Eigen, G. and Brown, D. N. and Kolomensky, Yu. G. and Fritsch, M. and Koch, H. and Schroeder, T. and Cheaib, R. and Hearty, C. and Mattison, T. S. and McKenna, J. A. and So, R. Y. and Blinov, V. E. and Buzykaev, A. R. and Druzhinin, V. P. and Golubev, V. B. and Kozyrev, E. A. and Kravchenko, E. A. and Onuchin, A. P. and Serednyakov, S. I. and Skovpen, Yu. I. and Solodov, E. P. and Todyshev, K. Yu. and Lankford, A. J. and Dey, B. and Gary, J. W. and Long, O. and Eisner, A. M. and Lockman, W. S. and Panduro Vazquez, W. and Chao, D. S. and Cheng, C. H. and Echenard, B. and Flood, K. T. and Hitlin, D. G. and Kim, J. and Li, Y. and Lin, D. X. and Miyashita, T. S. and Ongmongkolkul, P. and Oyang, J. and Porter, F. C. and Röhrken, M. and Huard, Z. and Meadows, B. T. and Pushpawela, B. G. and Sokoloff, M. D. and Sun, L. and Smith, J. G. and Wagner, S. R. and Bernard, D. and Verderi, M. and Bettoni, D. and Bozzi, C. and Calabrese, R. and Cibinetto, G. and Fioravanti, E. and Garzia, I. and Luppi, E. and Santoro, V. and Calcaterra, A. and de Sangro, R. and Finocchiaro, G. and Martellotti, S. and Patteri, P. and Peruzzi, I. M. and Piccolo, M. and Rotondo, M. and Zallo, A. and Passaggio, S. and Patrignani, C. and Shuve, B. J. and Lacker, H. M. and Bhuyan, B. and Mallik, U. and Chen, C. and Cochran, J. and Prell, S. and Gritsan, A. V. and Arnaud, N. and Davier, M. and Le Diberder, F. and Lutz, A. M. and Wormser, G. and Lange, D. J. and Wright, D. M. and Coleman, J. P. and Gabathuler, E. and Hutchcroft, D. E. and Payne, D. J. and Touramanis, C. and Bevan, A. J. and Di Lodovico, F. and Sacco, R. and Cowan, G. and Banerjee, Sw. and Brown, D. N. and Davis, C. L. and Denig, A. G. and Gradl, W. and Griessinger, K. and Hafner, A. and Schubert, K. R. and Barlow, R. J. and Lafferty, G. D. and Cenci, R. and Jawahery, A. and Roberts, D. A. and Cowan, R. and Robertson, S. H. and Seddon, R. M. and Neri, N. and Palombo, F. and Cremaldi, L. and Godang, R. and Summers, D. J. and Taras, P. and De Nardo, G. and Sciacca, C. and Raven, G. and Jessop, C. P. and LoSecco, J. M. and Honscheid, K. and Kass, R. and Gaz, A. and Margoni, M. and Posocco, M. and Simi, G. and Simonetto, F. and Stroili, R. and Akar, S. and Ben-Haim, E. and Bomben, M. and Bonneaud, G. R. and Calderini, G. and Chauveau, J. and Marchiori, G. and Ocariz, J. and Biasini, M. and Manoni, E. and Rossi, A. and Batignani, G. and Bettarini, S. and Carpinelli, M. and Casarosa, G. and Chrzaszcz, M. and Forti, F. and Giorgi, M. A. and Lusiani, A. and Oberhof, B. and Paoloni, E. and Rama, M. and Rizzo, G. and Walsh, J. J. and Zani, L. and Smith, A. J. S. and Anulli, F. and Faccini, R. and Ferrarotto, F. and Ferroni, F. and Pilloni, A. and Piredda, G. and Bünger, C. and Dittrich, S. and Grünberg, O. and Heß, M. and Leddig, T. and Voß, C. and Waldi, R. and Adye, T. and Wilson, F. F. and Emery, S. and Vasseur, G. and Aston, D. and Cartaro, C. and Convery, M. R. and Dorfan, J. and Dunwoodie, W. and Ebert, M. and Field, R. C. and Fulsom, B. G. and Graham, M. T. and Hast, C. and Innes, W. R. and Kim, P. and Leith, D. W. G. S. and Luitz, S. and MacFarlane, D. B. and Muller, D. R. and Neal, H. and Ratcliff, B. N. and Roodman, A. and Sullivan, M. K. and Va’vra, J. and Wisniewski, W. J. and Purohit, M. V. and Wilson, J. R. and Randle-Conde, A. and Sekula, S. J. and Ahmed, H. and Bellis, M. and Burchat, P. R. and Puccio, E. M. T. and Alam, M. S. and Ernst, J. A. and Gorodeisky, R. and Guttman, N. and Peimer, D. R. and Soffer, A. and Spanier, S. M. and Ritchie, J. L. and Schwitters, R. F. and Izen, J. M. and Lou, X. C. and Bianchi, F. and De Mori, F. and Filippi, A. and Gamba, D. and Lanceri, L. and Vitale, L. and Martinez-Vidal, F. and Oyanguren, A. and Albert, J. and Beaulieu, A. and Bernlochner, F. U. and King, G. J. and Kowalewski, R. and Lueck, T. and Nugent, I. M. and Roney, J. M. and Sibidanov, A. and Sobie, R. J. and Tasneem, N. and Gershon, T. J. and Harrison, P. F. and Latham, T. E. and Prepost, R. and Wu, S. L. (2020) Precision Measurement of the Ratio B(Υ(3S) → τ⁺τ⁻)/B(Υ(3S) → μ⁺μ⁻). Physical Review Letters, 125 (24). Art. No. 241801. ISSN 0031-9007.

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We report on a precision measurement of the ratio R^(Υ(3S))_(τμ) = B(Υ(3S) → τ⁺τ⁻)/B(Υ(3S) → μ⁺μ⁻) using data collected with the BABAR detector at the SLAC PEP-II e⁺e⁻ collider. The measurement is based on a 28  fb⁻¹ data sample collected at a center-of-mass energy of 10.355 GeV corresponding to a sample of 122 million Υ(3S) mesons. The ratio is measured to be R^(Υ(3S))_(τμ) = 0.966±0.008_(stat)±0.014_(syst) and is in agreement with the standard model prediction of 0.9948 within 2 standard deviations. The uncertainty in R^(Υ(3S))_(τμ) is almost an order of magnitude smaller than the only previous measurement.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Echenard, B.0000-0002-3866-9370
Hitlin, D. G.0000-0003-4028-6982
Porter, F. C.0000-0003-1948-8889
Sibidanov, A.0000-0001-8805-4895
Alternate Title:Precision measurement of the B(Υ(3S) → τ⁺τ⁻)/B(Υ(3S) → μ⁺μ⁻) ratio
Additional Information:© 2020 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. Received 13 May 2020; accepted 20 October 2020; published 8 December 2020. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues, and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by DOE and NSF (USA), NSERC (Canada), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (Netherlands), NFR (Norway), MES (Russia), MINECO (Spain), STFC (United Kingdom), BSF (USA-Israel). Individuals have received support from the Marie Curie EIF (European Union) and the A. P. Sloan Foundation (USA).
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Natural Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Commissariat à l'énergie atomique (CEA)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Bundesministerium für Bildung und Forschung (BMBF)UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Stichting voor Fundamenteel Onderzoek der Materie (FOM)UNSPECIFIED
Research Council of NorwayUNSPECIFIED
Ministry of Education and Science of the Russian FederationUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
Binational Science Foundation (USA-Israel)UNSPECIFIED
Marie Curie FellowshipUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:24
Record Number:CaltechAUTHORS:20201215-083528430
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107081
Deposited By: Tony Diaz
Deposited On:15 Dec 2020 21:48
Last Modified:15 Dec 2020 21:48

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