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Search for pair production of third-generation leptoquarks and top squarks in pp collisions at sqrt(s) = 7 TeV
Chatrchyan S., Besançon M., Choudhury S., Dejardin M., Denegri D. et al
Physical Review Letters 110 (2013) 081801 - http://hal.in2p3.fr/in2p3-00744368
Physique/Physique des Hautes Energies - Expérience
Search for pair production of third-generation leptoquarks and top squarks in pp collisions at sqrt(s) = 7 TeV
S. Chatrchyan, M. Besançon1, S. Choudhury1, M. Dejardin1, D. Denegri1, B. Fabbro1, J.L. Faure1, F. Ferri1, S. Ganjour1, A. Givernaud1, P. Gras1, G. Hamel de Monchenault1, P. Jarry1, E. Locci1, J. Malcles1, L. Millischer1, A. Nayak1, J. Rander1, A. Rosowsky1, I. Shreyber1, M. Titov1, S. Baffioni2, F. Beaudette2, L. Benhabib2, L. Bianchini2, M. Bluj2, C. Broutin2, Pierre Busson ()2, C. Charlot2, N. Daci2, T. Dahms2, L. Dobrzynski2, R. Granier de Cassagnac2, M. Haguenauer2, P. Mine2, C. Mironov2, I.N. Naranjo2, M. Nguyen2, C. Ochando2, P. Paganini2, D. Sabes2, R. Salerno2, Y. Sirois2, C. Veelken2, A. Zabi2, J.-L. Agram3, J. Andrea3, D. Bloch3, D. Bodin3, J.-M. Brom3, M. Cardaci3, E.C. Chabert3, C. Collard3, E. Conte3, F. Drouhin3, C. Ferro3, J.-C. Fontaine3, D. Gele3, U. Goerlach3, P. Juillot3, A.-C. Le Bihan3, P. Van Hove3, F. Fassi4, D. Mercier4, S. Beauceron5, N. Beaupere5, O. Bondu5, G. Boudoul5, J. Chasserat5, R. Chierici5, D. Contardo5, P. Depasse5, H. El Mamouni5, J. Fay5, S. Gascon5, M. Gouzevitch5, B. Ille5, T. Kurca5, M. Lethuillier5, L. Mirabito5, S. Perries5, L. Sgandurra5, V. Sordini5, Y. Tschudi5, P. Verdier5, S. Viret5
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
CEA : DSM/IRFU
France
2 :  LLR - Laboratoire Leprince-Ringuet
http://polywww.in2p3.fr/
CNRS : UMR7638 – IN2P3 – Polytechnique - X
Route de Saclay - 91128 Palaiseau Cedex
France
3 :  DRS-IPHC - Département Recherches Subatomiques
CNRS : UMR7178 – IN2P3 – Université de Strasbourg
23 rue du Loess - BP28 67037 Strasbourg cedex 2
France
4 :  CC IN2P3 - Centre de Calcul de l'inst. national de phy. nucléaire et de phy. des particules
http://cc.in2p3.fr/
CNRS : USR6402 – IN2P3
12-14, boulevard Niels Bohr 69622 VILLEURBANNE CEDEX
France
5 :  IPNL - Institut de Physique Nucléaire de Lyon
http://www.ipnl.in2p3.fr/
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
France
Results are presented from a search for pair production of third-generation scalar and vector leptoquarks, and top squarks, decaying into a tau lepton and a b quark. The search is based on a data sample of pp collisions at sqrt(s) = 7 TeV, which is collected by the CMS detector at the LHC and corresponds to an integrated luminosity of 4.8 inverse femtobarns. The number of observed events containing two tau leptons and two b-tagged jets is found to be in agreement with the standard model prediction. The results are interpreted in several scenarios, with exclusion limits on mass parameters at 95% confidence level. Vector leptoquarks with masses below 760 GeV are excluded and, if the branching fraction of the scalar leptoquark decay to tau lepton and b quark is assumed to be unity, third-generation scalar leptoquarks with masses below 525 GeV are ruled out. Limits are also set on the cross section for pair production of top squarks in a supersymmetric model with R-parity violation. Top squarks with masses below 453 GeV are excluded for a typical benchmark scenario, assuming that the coupling between the top squark, tau lepton, and b quark, lambda'[333]=1; and limits on lambda'[333] are set. These results are the most stringent for these scenarios to date.
CMS

Articles dans des revues avec comité de lecture
2013
Physical Review Letters (Phys. Rev. Lett.)
Publisher American Physical Society
ISSN 0031-9007 (eISSN : 1079-7114)
110
081801

Submitted to Physical Review Letters ; see paper for full list of authors
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1210.5629