Searches for violation of lepton flavour and baryon number in tau lepton decays at LHCb

• Published in: Physics letters. B Vol. 724; no. 1-3; pp. 36 - 45
• Main Authors: Anderlini, L., Bauer, Th, Bay, A., Beddow, J., Bedeschi, F., Belyaev, I., Benson, S., van Beuzekom, M., Bird, T., Bozzi, C., Bursche, A., Carson, L., Cid Vidal, X., Coca, C., Craik, D.C., David, P., De Capua, S., De Cian, M., Deckenhoff, M., Del Buono, L., Dziurda, A., Fave, V., Francisco, O., Frosini, M., Gandelman, M., Garrido, L., Göbel, C., Golubkov, D., Gomes, A., Gushchin, E., Haefeli, G., Hall, S., He, J., van Herwijnen, E., Huse, T., Ilten, P., Jaeger, A., John, M., Johnson, D., Karacson, M., Keune, A., Komarov, I., Koopman, R.F., Lanciotti, E., Lefèvre, R., Lesiak, T., Liu, G., Longstaff, I., Lopez-March, N., Machikhiliyan, I.V., Maev, O., Martin, L., Massafferri, A., Matev, R., Meissner, M., Mountain, R., Muster, B., Nakada, T., Nandakumar, R., Niess, V., Nikodem, T., Papanestis, A., Pappagallo, M., Parkes, C., Passaleva, G., Patel, G.D., Perego, D.L., Perez Trigo, E., Perrin-Terrin, M., Playfer, S., Puig Navarro, A., Punzi, G., Qian, W., Rives Molina, V., Robbe, P., Romero Vidal, A., Saitta, B., Salzmann, C., Santamarina Rios, C., Sapunov, M., Satriano, C., Schiller, M., Sciascia, B., Serra, N., Shires, A., Skwarnicki, T., Souza, D., Stagni, F., Storaci, B., Swientek, S., Tourneur, S., Veneziano, G., Vesterinen, M., Volyanskyy, D., Voong, D., Watson, N.K., Wiechczynski, J., Wishahi, J., Witek, M., Wotton, S.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 09.07.2013; Elsevier
• Subjects: CP violation (Nuclear physics); High Energy Physics - Experiment; Leptons (Física nuclear); Leptons (Nuclear physics); Neutrinos; Neutrins; Particles (Nuclear physics); Partícules (Física nuclear); Physics; Violació CP (Física nuclear)
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/j.physletb.2013.05.063

Searches for the lepton flavour violating decay τ−→μ−μ+μ− and the lepton flavour and baryon number violating decays τ−→p¯μ+μ− and τ−→pμ−μ− have been carried out using proton–proton collision data, corresponding to an integrated luminosity of 1.0 fb−1, taken by the LHCb experiment at s=7 TeV. No evidence has been found for any signal, and limits have been set at 90% confidence level on the branching fractions: B(τ−→μ−μ+μ−)<8.0×10−8, B(τ−→p¯μ+μ−)<3.3×10−7 and B(τ−→pμ−μ−)<4.4×10−7. The results for the τ−→p¯μ+μ− and τ−→pμ−μ− decay modes represent the first direct experimental limits on these channels.