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Search for the standard model Higgs boson in the decay channel H to ZZ to 4 leptons in pp collisions at sqrt(s) = 7 TeV

S. Chatrchyan D. Sillou 1 M. Besancon 2 S. Choudhury 2 M. Dejardin 2 D. Denegri 2 B. Fabbro 2 J.L. Faure 2 F. Ferri 2 S. Ganjour 2 A. Givernaud 2 P. Gras 2 G. Hamel de Monchenault 2 P. Jarry 2 E. Locci 2 J. Malcles 2 L. Millischer 2 J. Rander 2 A. Rosowsky 2 I. Shreyber 2 M. Titov 2 S. Baffioni 3 F. Beaudette 3 L. Benhabib 3 L. Bianchini 3 M. Bluj 3 C. Broutin 3 Pierre Busson 3 C. Charlot 3 N. Daci 3 T. Dahms 3 L. Dobrzynski 3 S. Elgammal 3 R. Granier de Cassagnac 3 M. Haguenauer 3 P. Mine 3 C. Mironov 3 C. Ochando 3 P. Paganini 3 D. Sabes 3 R. Salerno 3 Y. Sirois 3 C. Thiebaux 3 C. Veelken 3 A. Zabi 3 J.-L. Agram 4 J. Andrea 4 D. Bloch 4 D. Bodin 4 J.-M. Brom 4 M. Cardaci 4 E.C. Chabert 4 C. Collard 4 E. Conte 4 F. Drouhin 4 C. Ferro 4 J.-C. Fontaine 4 D. Gele 4 U. Goerlach 4 P. Juillot 4 M. Karim 4 A.-C. Le Bihan 4 P. van Hove 4 F. Fassi 5 D. Mercier 5 C. Baty 6 S. Beauceron 6 N. Beaupere 6 M. Bedjidian 7 O. Bondu 6 G. Boudoul 6 D. Boumediene 6 H. Brun 7 J. Chasserat 6 R. Chierici 6 D. Contardo 6 P. Depasse 6 H. El Mamouni 6 A. Falkiewicz 6 J. Fay 6 S. Gascon 6 M. Gouzevitch 6 B. Ille 6 T. Kurca 7 T. Le Grand 6 M. Lethuillier 6 L. Mirabito 6 S. Perries 6 V. Sordini 6 S. Tosi 6 Y. Tschudi 6 P. Verdier 6 S. Viret 6
Abstract : A search for a Higgs boson in the four-lepton decay channel H to ZZ, with each Z boson decaying to an electron or muon pair, is reported. The search covers Higgs boson mass hypotheses in the range 110 < mH < 600 GeV. The analysis uses data corresponding to an integrated luminosity of 4.7 inverse femtobarns recorded by the CMS detector in pp collisions at sqrt(s) = 7 TeV from the LHC. Seventy-two events are observed with four-lepton invariant mass m[4 leptons] > 100 GeV (with thirteen below 160 GeV), while 67.1 +/- 6.0 (9.5 +/-1.3) events are expected from background. The four-lepton mass distribution is consistent with the expectation of standard model background production of ZZ pairs. Upper limits at 95% confidence level exclude the standard model Higgs boson in the ranges 134-158 GeV, 180-305 GeV, and 340 -465 GeV. Small excesses of events are observed around masses of 119, 126, and 320 GeV, making the observed limits weaker than expected in the absence of a signal.
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Submitted on : Friday, February 10, 2012 - 7:24:40 AM
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S. Chatrchyan, D. Sillou, M. Besancon, S. Choudhury, M. Dejardin, et al.. Search for the standard model Higgs boson in the decay channel H to ZZ to 4 leptons in pp collisions at sqrt(s) = 7 TeV. Physical Review Letters, American Physical Society, 2012, 108, pp.111804. ⟨10.1103/PhysRevLett.108.111804⟩. ⟨in2p3-00668585⟩

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