Search for a heavy particle decaying into an electron and a muon with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC

G. Aad , S. Albrand (1) , M.L. Andrieux (1) , B. Clement (1) , J. Collot (1) , S. Crépé-Renaudin (1) , P. de Saintignon (1) , P.A. Delsart (1) , J. Donini (1) , Daniel Dzahini (1) , J.Y. Hostachy (1) , E. Laisne (1) , F. Ledroit-Guillon (1) , A. Lleres (1) , A. Lucotte (1) , F. Malek (1) , P. Martin (1) , F. Polci (1) , J. Stark (1) , X. Sun (1) , B. Trocmé (1) , C. Biscarat (2) , E. Cogneras (2) , G. Rahal (2) , H. Bachacou (3) , F. Bauer (3) , N. Besson (3) , M. Boonekamp (3) , L. Chevalier (3) , J. Ernwein (3) , A.I. Etienvre (3) , A. Formica (3) , L. Gauthier (3) , F. Giraud (3) , C. Guyot (3) , S. Hassani (3) , W. Kozanecki (3) , E. Lancon (3) , J.F. Laporte (3) , E. Le Menedeu (3) , M. Legendre (3) , B. Lenzi (3) , B. Mansoulie (3) , J.-P. Meyer (3) , N. Morange (3) , R. Nicolaidou (3) , A. Ouraou (3) , D.M. Pomarede (3) , B. Resende (3) , C.R. Royon (3) , Ph. Schune (3) , J. Schwindling (3) , O. Simard (3) , M. Virchaux (3) , J. Yu (3) , Emmanuel Busato (4) , D. Calvet (4) , S. Calvet (4) , Reina Coromoto Camacho Toro (4) , Diane Cinca (4) , R. Febbraro (4) , P.L.Y. Gris (4) , N. Ghodbane (4) , C. Guicheney (4) , D. Pallin (4) , F. Podlyski (4) , C. Santoni (4) , L. P. Says (4) , F. Vazeille (4) , S. Viret (4) , L. Aperio-Bella (5) , B. Aubert (5) , N. Berger (5) , J. Colas (5) , L. Di Ciaccio (5) , T.K.O. Doan (5) , M. El Kacimi (5) , S. Elles (5) , P. Ghez (5) , M. Gouanere (5) , C. Goy (5) , T. Guillemin (5) , L. Helary (5) , T. Hryn'Ova (5) , G. Ionescu (5) , A. Jeremie (5) , S. Jézéquel (5) , M. Kataoka (5) , J. Labbe (5) , R. Lafaye (5) , Jérémy Lévêque (5) , N. Massol (5) , P. Perrodo (5) , H. Przysiezniak (5) , G. Sauvage (5) , T. Todorov (5) , D. Tsionou (5) , I. Wingerter-Seez (5) , R. Zitoun (5) , Y. Zolnierowski (5) , H. Abreu (6) , C. Arnault (6) , E. Augé (6) , P. Barrillon (6) , M. Benoit (6) , S. Binet (6) , J.-B. Blanchard (6) , C. Bourdarios (6) , D. Breton (6) , C. Collard (6) , C. de La Taille (6) , J.B. de Vivie de Regie (6) , Sara Diglio (6) , F. Dudziak (6) , L. Duflot (6) , M. Escalier (6) , A.C. Falou (6) , L. Fayard (6) , D. Fournier (6) , J.-F. Grivaz (6) , M. Heller (6) , S. Henrot-Versillé (6) , J. Hrivnac (6) , L. Iconomidou-Fayard (6) , J. Idarraga (6) , M. Kado (6) , A. Lounis (6) , N. Makovec (6) , P. Matricon (6) , Y. Nakahama (6) , F. Niedercorn (6) , L. Poggioli (6) , P. Puzo (6) , A. Renaud (6) , D. Rousseau (6) , X. Ruan (6) , G. Rybkin (6) , J.B. Sauvan (6) , J. Schaarschmidt (6) , A.C. Schaffer (6) , L. Serin (6) , S. Simion (6) , R. Tanaka (6) , D. Varouchas (6) , J.J. Veillet (6) , I. Vukotic (6) , F. Wicek (6) , D. Zerwas (6) , Zhiqing Zhang (6) , T. Beau (7) , S. Bordoni (7) , G. Calderini (7) , A. Camard (7) , P. Cavalleri (7) , E. Chareyre (7) , S. de Cecco (7) , F. Derue (7) , D. Imbault (7) , M.W. Krasny (7) , D. Lacour (7) , B. Laforge (7) , O. Le Dortz (7) , J. Lellouch (7) , G. Marchiori (7) , I. Nikolic-Audit (7) , J. Ocariz (7) , M. Ridel (7) , L. Roos (7) , Ph. Schwemling (7) , Timothée Theveneaux-Pelzer (7) , S. Trincaz-Duvoid (7) , T.N. Trinh (7) , F. Vannucci (8) , C. P. Bee (9) , C. Benchouk (9) , K. Bernardet (9) , N. Boussons (9) , J. C. Clèmens (9) , Y. Coadou (9) , P. Delpierre (9) , F. Djama (9) , F. Etienne (9) , L. Feligioni (9) , F. Henry- Couannier (9) , D. Hoffmann (9) , F. Hubaut (9) , E. B. F. G. Knoops (9) , E. Le Guirriec (9) , B. Li (9) , E. Monnier (9) , J. Odier (9) , E. Petit (9) , P. Pralavorio (9) , Z. Qian (9) , A. Rozanov (9) , M. Talby (9) , N. Tannoury (9) , S. Tisserant (9) , J. Toth (9) , F. Touchard (9) , L. Vacavant (9) , S. Aoun (9)

1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 CC-IN2P3 - Centre de Calcul de l'IN2P3
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 LAPP - Laboratoire d'Annecy de Physique des Particules
6 LAL - Laboratoire de l'Accélérateur Linéaire
7 LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
8 APC - Neutrinos
9 CPPM - Centre de Physique des Particules de Marseille

This Letter presents the first search for a heavy particle decaying into an e\mu final state in sqrt(s)=7 TeV pp collisions at the LHC. The data were recorded by the ATLAS detector during 2010 and correspond to a total integrated luminosity of 35/pb. No excess above the Standard Model background expectation is observed. Exclusions at 95% confidence level are placed on two representative models. In an R-parity violating supersymmetric model, tau sneutrinos with a mass below 0.75 TeV are excluded, assuming single coupling dominance and the couplings lambda'_{311}=0.11, lambda_{312}=0.07. In a lepton flavor violating model, a Z'-like vector boson with masses of 0.70 to 1.00 TeV and corresponding cross sections times branching ratios of 0.175 to 0.183 pb is excluded. These results extend to higher mass RPV sneutrinos and LFV Z's than previous constraints from the Tevatron.

Domaines: Physique des Hautes Energies - Expérience [hep-ex]

G. Aad, S. Albrand, M.L. Andrieux, B. Clement, J. Collot, et al.. Search for a heavy particle decaying into an electron and a muon with the ATLAS detector in sqrt(s) = 7 TeV pp collisions at the LHC. Physical Review Letters, 2011, 106, pp.251801. ⟨10.1103/PhysRevLett.106.251801⟩. ⟨in2p3-00581038⟩