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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 D. 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 5 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 6 B. Aubert 6 N. Berger 6 J. Colas 6 L. Di Ciaccio 6 T.K.O. Doan 6 M. El Kacimi 6 S. Elles 6 P. Ghez 6 M. Gouanere 6 C. Goy 6 T. Guillemin 6 L. Helary 6 T. Hryn'Ova 6 G. Ionescu 6 A. Jeremie 6 S. Jézéquel 6 M. Kataoka 6 J. Labbe 6 R. Lafaye 6 Jérémy Lévêque 6 N. Massol 6 P. Perrodo 6 H. Przysiezniak 6 G. Sauvage 6 T. Todorov 6 D. Tsionou 6 I. Wingerter-Seez 6 R. Zitoun 6 Y. Zolnierowski 6 H. Abreu 7 C. Arnault 7 E. Augé 7 P. Barrillon 7 M. Benoit 7 S. Binet 7 J.-B. Blanchard 7 C. Bourdarios 7 D. Breton 7 C. Collard 7 C. de la Taille 7 J.B. de Vivie de Regie 7 S. Diglio 7 F. Dudziak 7 L. Duflot 7 M. Escalier 7 A.C. Falou 7 L. Fayard 7 D. Fournier 7 J.-F. Grivaz 7 M. Heller 7 S. Henrot-Versillé 7 J. Hrivnac 7 L. Iconomidou-Fayard 7 J. Idarraga 7 M. Kado 7 A. Lounis 7 N. Makovec 7 P. Matricon 7 Y. Nakahama 7 F. Niedercorn 7 L. Poggioli 7 P. Puzo 7 A. Renaud 7 D. Rousseau 7 X. Ruan 7 G. Rybkin 7 J.B. Sauvan 7 J. Schaarschmidt 7 A.C. Schaffer 7 L. Serin 7 S. Simion 7 R. Tanaka 7 D. Varouchas 7 J.J. Veillet 7 I. Vukotic 7 F. Wicek 7 D. Zerwas 7 Zhiqing Zhang 7 T. Beau 8 S. Bordoni 8 G. Calderini 8 A. Camard 8 P. Cavalleri 8 E. Chareyre 8 S. de Cecco 8 F. Derue 8 D. Imbault 8 M.W. Krasny 8 D. Lacour 8 B. Laforge 8 O. Le Dortz 8 J. Lellouch 8 G. Marchiori 8 I. Nikolic-Audit 8 J. Ocariz 8 M. Ridel 8 L. Roos 8 Ph. Schwemling 8 Timothée Theveneaux-Pelzer 8 S. Trincaz-Duvoid 8 T.N. Trinh 8 F. Vannucci 9 C. P. Bee 10 C. Benchouk 10 K. Bernardet 10 N. Boussons 10 J. C. Clèmens 10 Y. Coadou 10 P. Delpierre 10 F. Djama 10 F. Etienne 10 L. Feligioni 10 F. Henry- Couannier 10 D. Hoffmann 10 F. Hubaut 10 E. B. F. G. Knoops 10 E. Le Guirriec 10 B. Li 10 E. Monnier 10 J. Odier 10 E. Petit 10 P. Pralavorio 10 Z. Qian 10 A. Rozanov 10 M. Talby 10 N. Tannoury 10 S. Tisserant 10 J. Toth 10 F. Touchard 10 L. Vacavant 10 S. Aoun 10
Abstract : 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.
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Submitted on : Wednesday, March 30, 2011 - 9:11:50 AM
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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, American Physical Society, 2011, 106, pp.251801. ⟨10.1103/PhysRevLett.106.251801⟩. ⟨in2p3-00581038⟩

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