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Evidence for the Rare Decay Σ^{+}→pμ^{+}μ^{-}.

  • Author(s): Aaij, R;
  • Adeva, B;
  • Adinolfi, M;
  • Ajaltouni, Z;
  • Akar, S;
  • Albrecht, J;
  • Alessio, F;
  • Alexander, M;
  • Alfonso Albero, A;
  • Ali, S;
  • Alkhazov, G;
  • Alvarez Cartelle, P;
  • Alves, AA;
  • Amato, S;
  • Amerio, S;
  • Amhis, Y;
  • An, L;
  • Anderlini, L;
  • Andreassi, G;
  • Andreotti, M;
  • Andrews, JE;
  • Appleby, RB;
  • Archilli, F;
  • d'Argent, P;
  • Arnau Romeu, J;
  • Artamonov, A;
  • Artuso, M;
  • Aslanides, E;
  • Atzeni, M;
  • Auriemma, G;
  • Baalouch, M;
  • Babuschkin, I;
  • Bachmann, S;
  • Back, JJ;
  • Badalov, A;
  • Baesso, C;
  • Baker, S;
  • Balagura, V;
  • Baldini, W;
  • Baranov, A;
  • Barlow, RJ;
  • Barschel, C;
  • Barsuk, S;
  • Barter, W;
  • Baryshnikov, F;
  • Batozskaya, V;
  • Battista, V;
  • Bay, A;
  • Beaucourt, L;
  • Beddow, J;
  • Bedeschi, F;
  • Bediaga, I;
  • Beiter, A;
  • Bel, LJ;
  • Beliy, N;
  • Bellee, V;
  • Belloli, N;
  • Belous, K;
  • Belyaev, I;
  • Ben-Haim, E;
  • Bencivenni, G;
  • Benson, S;
  • Beranek, S;
  • Berezhnoy, A;
  • Bernet, R;
  • Berninghoff, D;
  • Bertholet, E;
  • Bertolin, A;
  • Betancourt, C;
  • Betti, F;
  • Bettler, MO;
  • van Beuzekom, M;
  • Bezshyiko, Ia;
  • Bifani, S;
  • Billoir, P;
  • Birnkraut, A;
  • Bizzeti, A;
  • Bjørn, M;
  • Blake, T;
  • Blanc, F;
  • Blusk, S;
  • Bocci, V;
  • Boettcher, T;
  • Bondar, A;
  • Bondar, N;
  • Bordyuzhin, I;
  • Borghi, S;
  • Borisyak, M;
  • Borsato, M;
  • Bossu, F;
  • Boubdir, M;
  • Bowcock, TJV;
  • Bowen, E;
  • Bozzi, C;
  • Braun, S;
  • Brodzicka, J;
  • Brundu, D;
  • Buchanan, E;
  • Burr, C;
  • Bursche, A;
  • Buytaert, J;
  • Byczynski, W;
  • Cadeddu, S;
  • Cai, H;
  • Calabrese, R;
  • Calladine, R;
  • Calvi, M;
  • Calvo Gomez, M;
  • Camboni, A;
  • Campana, P;
  • Campora Perez, DH;
  • Capriotti, L;
  • Carbone, A;
  • Carboni, G;
  • Cardinale, R;
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  • Charpentier, Ph;
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  • Cheung, SF;
  • Chitic, S-G;
  • Chobanova, V;
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  • Chubykin, A;
  • Ciambrone, P;
  • Cid Vidal, X;
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  • Graciani Diaz, R;
  • Granado Cardoso, LA;
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  • LHCb Collaboration
  • et al.
Abstract

A search for the rare decay Σ^{+}→pμ^{+}μ^{-} is performed using pp collision data recorded by the LHCb experiment at center-of-mass energies sqrt[s]=7 and 8 TeV, corresponding to an integrated luminosity of 3  fb^{-1}. An excess of events is observed with respect to the background expectation, with a signal significance of 4.1 standard deviations. No significant structure is observed in the dimuon invariant mass distribution, in contrast with a previous result from the HyperCP experiment. The measured Σ^{+}→pμ^{+}μ^{-} branching fraction is (2.2_{-1.3}^{+1.8})×10^{-8}, where statistical and systematic uncertainties are included, which is consistent with the standard model prediction.

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