학술논문

Search for the lepton-flavour violating decay $D^0 \to e^\pm\mu^\mp$
Document Type
Working Paper
Author
LHCb collaborationAaij, R.Adeva, B.Adinolfi, M.Affolder, A.Ajaltouni, Z.Akar, S.Albrecht, J.Alessio, F.Alexander, M.Ali, S.Alkhazov, G.Cartelle, P. AlvarezAlves Jr, A. A.Amato, S.Amerio, S.Amhis, Y.An, L.Anderlini, L.Anderson, J.Andreassi, G.Andreotti, M.Andrews, J. E.Appleby, R. B.Gutierrez, O. AquinesArchilli, F.d'Argent, P.Artamonov, A.Artuso, M.Aslanides, E.Auriemma, G.Baalouch, M.Bachmann, S.Back, J. J.Badalov, A.Baesso, C.Baldini, W.Barlow, R. J.Barschel, C.Barsuk, S.Barter, W.Batozskaya, V.Battista, V.Bay, A.Beaucourt, L.Beddow, J.Bedeschi, F.Bediaga, I.Bel, L. J.Bellee, V.Belloli, N.Belyaev, I.Ben-Haim, E.Bencivenni, G.Benson, S.Benton, J.Berezhnoy, A.Bernet, R.Bertolin, A.Bettler, M. -O.van Beuzekom, M.Bifani, S.Billoir, P.Bird, T.Birnkraut, A.Bizzeti, A.Blake, T.Blanc, F.Blouw, J.Blusk, S.Bocci, V.Bondar, A.Bondar, N.Bonivento, W.Borghi, S.Borsato, M.Bowcock, T. J. V.Bowen, E.Bozzi, C.Braun, S.Britsch, M.Britton, T.Brodzicka, J.Brook, N. H.Buchanan, E.Bursche, A.Buytaert, J.Cadeddu, S.Calabrese, R.Calvi, M.Gomez, M. CalvoCampana, P.Perez, D. CamporaCapriotti, L.Carbone, A.Carboni, G.Cardinale, R.Cardini, A.Carniti, P.Carson, L.Akiba, K. CarvalhoCasse, G.Cassina, L.Garcia, L. CastilloCattaneo, M.Cauet, Ch.Cavallero, G.Cenci, R.Charles, M.Charpentier, Ph.Chefdeville, M.Chen, S.Cheung, S. -F.Chiapolini, N.Chrzaszcz, M.Vidal, X. CidCiezarek, G.Clarke, P. E. L.Clemencic, M.Cliff, H. V.Closier, J.Coco, V.Cogan, J.Cogneras, E.Cogoni, V.Cojocariu, L.Collazuol, G.Collins, P.Comerma-Montells, A.Contu, A.Cook, A.Coombes, M.Coquereau, S.Corti, G.Corvo, M.Couturier, B.Cowan, G. A.Craik, D. C.Crocombe, A.Torres, M. CruzCunliffe, S.Currie, R.D'Ambrosio, C.Dall'Occo, E.Dalseno, J.David, P. N. Y.Davis, A.Francisco, O. De AguiarDe Bruyn, K.De Capua, S.De Cian, M.De Miranda, J. M.De Paula, L.De Simone, P.Dean, C. -T.Decamp, D.Deckenhoff, M.Del Buono, L.Déléage, N.Demmer, M.Derkach, D.Deschamps, O.Dettori, F.Dey, B.Di Canto, A.Di Ruscio, F.Dijkstra, H.Donleavy, S.Dordei, F.Dorigo, M.Suárez, A. DosilDossett, D.Dovbnya, A.Dreimanis, K.Dufour, L.Dujany, G.Durante, P.Dzhelyadin, R.Dziurda, A.Dzyuba, A.Easo, S.Egede, U.Egorychev, V.Eidelman, S.Eisenhardt, S.Eitschberger, U.Ekelhof, R.Eklund, L.Rifai, I. ElElsasser, Ch.Ely, S.Esen, S.Evans, H. M.Evans, T.Falabella, A.Färber, C.Farley, N.Farry, S.Fay, R.Ferguson, D.Albor, V. FernandezFerrari, F.Rodrigues, F. FerreiraFerro-Luzzi, M.Filippov, S.Fiore, M.Fiorini, M.Firlej, M.Fitzpatrick, C.Fiutowski, T.Fleuret, F.Fohl, K.Fol, P.Fontana, M.Fontanelli, F.Forty, R.Frank, M.Frei, C.Frosini, M.Fu, J.Furfaro, E.Torreira, A. GallasGalli, D.Gallorini, S.Gambetta, S.Gandelman, M.Gandini, P.Gao, Y.Pardiñas, J. GarcíaTico, J. GarraGarrido, L.Gascon, D.Gaspar, C.Gauld, R.Gavardi, L.Gazzoni, G.Gerick, D.Gersabeck, E.Gersabeck, M.Gershon, T.Ghez, Ph.Gianì, S.Gibson, V.Girard, O. G.Giubega, L.Gligorov, V. V.Göbel, C.Golubkov, D.Golutvin, A.Gomes, A.Gotti, C.Gándara, M. GrabalosaDiaz, R. GracianiCardoso, L. A. GranadoGraugés, E.Graverini, E.Graziani, G.Grecu, A.Greening, E.Gregson, S.Griffith, P.Grillo, L.Grünberg, O.Gui, B.Gushchin, E.Guz, Yu.Gys, T.Hadavizadeh, T.Hadjivasiliou, C.Haefeli, G.Haen, C.Haines, S. C.Hall, S.Hamilton, B.Han, X.Hansmann-Menzemer, S.Harnew, N.Harnew, S. T.Harrison, J.He, J.Head, T.Heijne, V.Hennessy, K.Henrard, P.Henry, L.van Herwijnen, E.Heß, M.Hicheur, A.Hill, D.Hoballah, M.Hombach, C.Hulsbergen, W.Humair, T.Hussain, N.Hutchcroft, D.Hynds, D.Idzik, M.Ilten, P.Jacobsson, R.Jaeger, A.Jalocha, J.Jans, E.Jawahery, A.John, M.Johnson, D.Jones, C. R.Joram, C.Jost, B.Jurik, N.Kandybei, S.Kanso, W.Karacson, M.Karbach, T. M.Karodia, S.Kecke, M.Kelsey, M.Kenyon, I. R.Kenzie, M.Ketel, T.Khairullin, E.Khanji, B.Khurewathanakul, C.Klaver, S.Klimaszewski, K.Kochebina, O.Kolpin, M.Komarov, I.Koopman, R. F.Koppenburg, P.Kozeiha, M.Kravchuk, L.Kreplin, K.Kreps, M.Krokovny, P.Kruse, F.Krzemien, W.Kucewicz, W.Kucharczyk, M.Kudryavtsev, V.Kuonen, A. K.Kurek, K.Kvaratskheliya, T.Lacarrere, D.Lafferty, G.Lai, A.Lambert, D.Lanfranchi, G.Langenbruch, C.Langhans, B.Latham, T.Lazzeroni, C.Gac, R. Levan Leerdam, J.Lees, J. -P.Lefèvre, R.Leflat, A.Lefrançois, J.Cid, E. LemosLeroy, O.Lesiak, T.Leverington, B.Li, Y.Likhomanenko, T.Liles, M.Lindner, R.Linn, C.Lionetto, F.Liu, B.Liu, X.Loh, D.Longstaff, I.Lopes, J. H.Lucchesi, D.Martinez, M. LucioLuo, H.Lupato, A.Luppi, E.Lupton, O.Lusiani, A.Machefert, F.Maciuc, F.Maev, O.Maguire, K.Malde, S.Malinin, A.Manca, G.Mancinelli, G.Manning, P.Mapelli, A.Maratas, J.Marchand, J. F.Marconi, U.Benito, C. MarinMarino, P.Marks, J.Martellotti, G.Martin, M.Martinelli, M.Santos, D. MartinezVidal, F. MartinezTostes, D. MartinsMassacrier, L. M.Massafferri, A.Matev, R.Mathad, A.Mathe, Z.Matteuzzi, C.Mauri, A.Maurin, B.Mazurov, A.McCann, M.McCarthy, J.McNab, A.McNulty, R.Meadows, B.Meier, F.Meissner, M.Melnychuk, D.Merk, M.Michielin, EMilanes, D. A.Minard, M. -N.Mitzel, D. S.Rodriguez, J. MolinaMonroy, I. A.Monteil, S.Morandin, M.Morawski, P.Mordà, A.Morello, M. J.Moron, J.Morris, A. B.Mountain, R.Muheim, F.Müller, D.Müller, J.Müller, K.Müller, V.Mussini, M.Muster, B.Naik, P.Nakada, T.Nandakumar, R.Nandi, A.Nasteva, I.Needham, M.Neri, N.Neubert, S.Neufeld, N.Neuner, M.Nguyen, A. D.Nguyen, T. D.Nguyen-Mau, C.Niess, V.Niet, R.Nikitin, N.Nikodem, T.Novoselov, A.O'Hanlon, D. P.Oblakowska-Mucha, A.Obraztsov, V.Ogilvy, S.Okhrimenko, O.Oldeman, R.Onderwater, C. J. G.Rodrigues, B. OsorioGoicochea, J. M. OtaloraOtto, A.Owen, P.Oyanguren, A.Palano, A.Palombo, F.Palutan, M.Panman, J.Papanestis, A.Pappagallo, M.Pappalardo, L. L.Pappenheimer, C.Parker, W.Parkes, C.Passaleva, G.Patel, G. D.Patel, M.Patrignani, C.Pearce, A.Pellegrino, A.Penso, G.Altarelli, M. PepePerazzini, S.Perret, P.Pescatore, L.Petridis, K.Petrolini, A.Petruzzo, M.Olloqui, E. PicatostePietrzyk, B.Pilař, T.Pinci, D.Pistone, A.Piucci, A.Playfer, S.Casasus, M. PloPoikela, T.Polci, F.Poluektov, A.Polyakov, I.Polycarpo, E.Popov, A.Popov, D.Popovici, B.Potterat, C.Price, E.Price, J. D.Prisciandaro, J.Pritchard, A.Prouve, C.Pugatch, V.Navarro, A. PuigPunzi, G.Qian, W.Quagliani, R.Rachwal, B.Rademacker, J. H.Rama, M.Pernas, M. RamosRangel, M. S.Raniuk, I.Rauschmayr, N.Raven, G.Redi, F.Reichert, S.Reid, M. M.Reis, A. C. dosRicciardi, S.Richards, S.Rihl, M.Rinnert, K.Molina, V. RivesRobbe, P.Rodrigues, A. B.Rodrigues, E.Lopez, J. A. RodriguezPerez, P. RodriguezRoiser, S.Romanovsky, V.Vidal, A. RomeroRonayne, J. W.Rotondo, M.Ruf, T.Valls, P. RuizSilva, J. J. SaboridoSagidova, N.Sail, P.Saitta, B.Guimaraes, V. SalustinoMayordomo, C. SanchezSedes, B. SanmartinSantacesaria, R.Rios, C. SantamarinaSantimaria, M.Santovetti, E.Sarti, A.Satriano, C.Satta, A.Saunders, D. M.Savrina, D.Schiller, M.Schindler, H.Schlupp, M.Schmelling, M.Schmelzer, T.Schmidt, B.Schneider, O.Schopper, A.Schubiger, M.Schune, M. -H.Schwemmer, R.Sciascia, B.Sciubba, A.Semennikov, A.Serra, N.Serrano, J.Sestini, L.Seyfert, P.Shapkin, M.Shapoval, I.Shcheglov, Y.Shears, T.Shekhtman, L.Shevchenko, V.Shires, A.Siddi, B. G.Coutinho, R. Silvade Oliveira, L. SilvaSimi, G.Sirendi, M.Skidmore, N.Skwarnicki, T.Smith, E.Smith, I. T.Smith, J.Smith, M.Snoek, H.Sokoloff, M. D.Soler, F. J. P.Soomro, F.Souza, D.De Paula, B. SouzaSpaan, B.Spradlin, P.Sridharan, S.Stagni, F.Stahl, M.Stahl, S.Stefkova, S.Steinkamp, O.Stenyakin, O.Stevenson, S.Stoica, S.Stone, S.Storaci, B.Stracka, S.Straticiuc, M.Straumann, U.Sun, L.Sutcliffe, W.Swientek, K.Swientek, S.Syropoulos, V.Szczekowski, M.Szumlak, T.T'Jampens, S.Tayduganov, A.Tekampe, T.Teklishyn, M.Tellarini, G.Teubert, F.Thomas, C.Thomas, E.van Tilburg, J.Tisserand, V.Tobin, M.Todd, J.Tolk, S.Tomassetti, L.Tonelli, D.Topp-Joergensen, S.Torr, N.Tournefier, E.Tourneur, S.Trabelsi, K.Tran, M. T.Tresch, M.Trisovic, A.Tsaregorodtsev, A.Tsopelas, P.Tuning, N.Ukleja, A.Ustyuzhanin, A.Uwer, U.Vacca, C.Vagnoni, V.Valenti, G.Vallier, A.Gomez, R. VazquezRegueiro, P. VazquezSierra, C. VázquezVecchi, S.Velthuis, J. J.Veltri, M.Veneziano, G.Vesterinen, M.Viaud, B.Vieira, D.Diaz, M. VieitesVilasis-Cardona, X.Volkov, V.Vollhardt, A.Volyanskyy, D.Voong, D.Vorobyev, A.Vorobyev, V.Voß, C.de Vries, J. A.Waldi, R.Wallace, C.Wallace, R.Walsh, J.Wang, J.Ward, D. R.Watson, N. K.Websdale, D.Weiden, A.Whitehead, M.Wilkinson, G.Wilkinson, M.Williams, M.Williams, M. P.Williams, T.Wilson, F. F.Wimberley, J.Wishahi, J.Wislicki, W.Witek, M.Wormser, G.Wotton, S. A.Wraight, K.Wright, S.Wyllie, K.Xie, Y.Xu, Z.Yang, Z.Yu, J.Yuan, X.Yushchenko, O.Zangoli, M.Zavertyaev, M.Zhang, L.Zhang, Y.Zhelezov, A.Zhokhov, A.Zhong, L.Zucchelli, S.
Source
Phys. Lett. B754 (2016) 167
Subject
High Energy Physics - Experiment
Language
Abstract
A search for the lepton-flavour violating decay $D^0 \to e^\pm \mu^\mp$ is made with a dataset corresponding to an integrated luminosity of 3.0 fb$^{-1}$ of proton-proton collisions at centre-of-mass energies of $7$ TeV and $8$ TeV, collected by the LHCb experiment. Candidate $D^0$ mesons are selected using the decay $D^{*+} \to D^0 \pi^+$ and the $D^0 \to e^\pm \mu^\mp$ branching fraction is measured using the decay mode $D^0 \to K^-\pi^+$ as a normalisation channel. No significant excess of $D^0 \to e^\pm \mu^\mp$ candidates over the expected background is seen, and a limit is set on the branching fraction, $\mathcal{B}(D^0 \to e^\pm \mu^\mp) < 1.3 \times 10^{-8}$, at 90 % confidence level. This is an order of magnitude lower than the previous limit and it further constrains the parameter space in some leptoquark models and in supersymmetric models with R-parity violation.
Comment: All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2015-048.html