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Published December 11, 2020 | Submitted + Published
Journal Article Open

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

Lees, J. P.
Poireau, V.
Tisserand, V.
Grauges, E.
Palano, A.
Eigen, G.
Brown, D. N.
Kolomensky, Yu. G.
Fritsch, M.
Koch, H.
Schroeder, T.
Cheaib, R.
Hearty, C.
Mattison, T. S.
McKenna, J. A.
So, R. Y.
Blinov, V. E.
Buzykaev, A. R.
Druzhinin, V. P.
Golubev, V. B.
Kozyrev, E. A.
Kravchenko, E. A.
Onuchin, A. P.
Serednyakov, S. I.
Skovpen, Yu. I.
Solodov, E. P.
Todyshev, K. Yu.
Lankford, A. J.
Dey, B.
Gary, J. W.
Long, O.
Eisner, A. M.
Lockman, W. S.
Panduro Vazquez, W.
Chao, D. S.
Cheng, C. H.
Echenard, B. ORCID icon
Flood, K. T.
Hitlin, D. G. ORCID icon
Kim, J.
Li, Y.
Lin, D. X.
Miyashita, T. S.
Ongmongkolkul, P.
Oyang, J.
Porter, F. C. ORCID icon
Röhrken, M.
Huard, Z.
Meadows, B. T.
Pushpawela, B. G.
Sokoloff, M. D.
Sun, L.
Smith, J. G.
Wagner, S. R.
Bernard, D.
Verderi, M.
Bettoni, D.
Bozzi, C.
Calabrese, R.
Cibinetto, G.
Fioravanti, E.
Garzia, I.
Luppi, E.
Santoro, V.
Calcaterra, A.
de Sangro, R.
Finocchiaro, G.
Martellotti, S.
Patteri, P.
Peruzzi, I. M.
Piccolo, M.
Rotondo, M.
Zallo, A.
Passaggio, S.
Patrignani, C.
Shuve, B. J.
Lacker, H. M.
Bhuyan, B.
Mallik, U.
Chen, C.
Cochran, J.
Prell, S.
Gritsan, A. V.
Arnaud, N.
Davier, M.
Le Diberder, F.
Lutz, A. M.
Wormser, G.
Lange, D. J.
Wright, D. M.
Coleman, J. P.
Gabathuler, E.
Hutchcroft, D. E.
Payne, D. J.
Touramanis, C.
Bevan, A. J.
Di Lodovico, F.
Sacco, R.
Cowan, G.
Banerjee, Sw.
Brown, D. N.
Davis, C. L.
Denig, A. G.
Gradl, W.
Griessinger, K.
Hafner, A.
Schubert, K. R.
Barlow, R. J.
Lafferty, G. D.
Cenci, R.
Jawahery, A.
Roberts, D. A.
Cowan, R.
Robertson, S. H.
Seddon, R. M.
Neri, N.
Palombo, F.
Cremaldi, L.
Godang, R.
Summers, D. J.
Taras, P.
De Nardo, G.
Sciacca, C.
Raven, G.
Jessop, C. P.
LoSecco, J. M.
Honscheid, K.
Kass, R.
Gaz, A.
Margoni, M.
Posocco, M.
Simi, G.
Simonetto, F.
Stroili, R.
Akar, S.
Ben-Haim, E.
Bomben, M.
Bonneaud, G. R.
Calderini, G.
Chauveau, J.
Marchiori, G.
Ocariz, J.
Biasini, M.
Manoni, E.
Rossi, A.
Batignani, G.
Bettarini, S.
Carpinelli, M.
Casarosa, G.
Chrzaszcz, M.
Forti, F.
Giorgi, M. A.
Lusiani, A.
Oberhof, B.
Paoloni, E.
Rama, M.
Rizzo, G.
Walsh, J. J.
Zani, L.
Smith, A. J. S.
Anulli, F.
Faccini, R.
Ferrarotto, F.
Ferroni, F.
Pilloni, A.
Piredda, G.
Bünger, C.
Dittrich, S.
Grünberg, O.
Heß, M.
Leddig, T.
Voß, C.
Waldi, R.
Adye, T.
Wilson, F. F.
Emery, S.
Vasseur, G.
Aston, D.
Cartaro, C.
Convery, M. R.
Dorfan, J.
Dunwoodie, W.
Ebert, M.
Field, R. C.
Fulsom, B. G.
Graham, M. T.
Hast, C.
Innes, W. R.
Kim, P.
Leith, D. W. G. S.
Luitz, S.
MacFarlane, D. B.
Muller, D. R.
Neal, H.
Ratcliff, B. N.
Roodman, A.
Sullivan, M. K.
Va'vra, J.
Wisniewski, W. J.
Purohit, M. V.
Wilson, J. R.
Randle-Conde, A.
Sekula, S. J.
Ahmed, H.
Bellis, M.
Burchat, P. R.
Puccio, E. M. T.
Alam, M. S.
Ernst, J. A.
Gorodeisky, R.
Guttman, N.
Peimer, D. R.
Soffer, A.
Spanier, S. M.
Ritchie, J. L.
Schwitters, R. F.
Izen, J. M.
Lou, X. C.
Bianchi, F.
De Mori, F.
Filippi, A.
Gamba, D.
Lanceri, L.
Vitale, L.
Martinez-Vidal, F.
Oyanguren, A.
Albert, J.
Beaulieu, A.
Bernlochner, F. U.
King, G. J.
Kowalewski, R.
Lueck, T.
Nugent, I. M.
Roney, J. M.
Sibidanov, A. ORCID icon
Sobie, R. J.
Tasneem, N.
Gershon, T. J.
Harrison, P. F.
Latham, T. E.
Prepost, R.
Wu, S. L.
BaBar Collaboration


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.

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).

Attached Files

Published - PhysRevLett.125.241801.pdf

Submitted - 2005.01230.pdf


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