Search for new particles decaying to ZZ using final states with leptons and jets with the ATLAS detector in s= 7TeV proton–proton collisions

Georges Aad, B Abbott,J Abdallah,AA Abdelalim,A Abdesselam,O Abdinov,B Abi,M Abolins, OS AbouZeid, H Abramowicz, H Abreu,E Acerbi,BS Acharya,L Adamczyk,DL Adams, TN Addy,J Adelman,M Aderholz, S Adomeit, P Adragna,T Adye, S Aefsky,JA Aguilar-Saavedra, M Aharrouche,SP Ahlen, F Ahles,A Ahmad, M Ahsan,G Aielli,T Akdogan,TPA Åkesson, G Akimoto,AV Akimov,A Akiyama,MS Alam,MA Alam,J Albert, S Albrand,M Aleksa, IN Aleksandrov, F Alessandria,C Alexa, G Alexander,G Alexandre,T Alexopoulos,M Alhroob,M Aliev,G Alimonti,J Alison,M Aliyev, BMM Allbrooke, PP Allport, SE Allwood-Spiers,J Almond, A Aloisio, R Alon,A Alonso,B Alvarez Gonzalez,MG Alviggi, K Amako, P Amaral,C Amelung,VV Ammosov,A Amorim, G Amoros, N Amram,C Anastopoulos, LS Ancu,N Andari, T Andeen,CF Anders, G Anders,KJ Anderson,A Andreazza, V Andrei,ML Andrieux,XS Anduaga,A Angerami, F Anghinolfi,A Anisenkov,N Anjos,A Annovi, A Antonaki,M Antonelli,A Antonov,J Antos, F Anulli, S Aoun,L Aperio Bella, R Apolle, G Arabidze, I Aracena,Y Arai, ATH Arce, S Arfaoui,JF Arguin,E Arik,M Arik, AJ Armbruster, O Arnaez, C Arnault, A Artamonov,G Artoni,D Arutinov, S Asai,R Asfandiyarov, S Ask, B Åsman,L Asquith,K Assamagan, A Astbury, A Astvatsatourov,B Aubert, E Auge, K Augsten, M Aurousseau,G Avolio,R Avramidou, D Axen, C Ay,G Azuelos, Y Azuma,MA Baak,G Baccaglioni, C Bacci,AM Bach,H Bachacou,K Bachas,M Backes,M Backhaus, E Badescu, P Bagnaia,S Bahinipati,Y Bai,DC Bailey, T Bain, JT Baines,OK Baker,MD Baker,S Baker,E Banas,P Banerjee,Sw Banerjee, D Banfi, A Bangert,V Bansal, HS Bansil,L Barak, SP Baranov, A Barashkou

Physics Letters B（2012）

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摘要

A search is presented for a narrow resonance decaying to a pair of Z bosons using data corresponding to 1.02 fb− 1 of integrated luminosity collected by the ATLAS experiment from pp collisions at s= 7 TeV. Events containing either four charged leptons (ℓ ℓ ℓ ℓ) or two charged leptons and two jets (ℓ ℓ j j) are analyzed and found to be consistent with the Standard Model background expectation. Lower limits on a resonance mass are set using the Randall–Sundrum (RS1) graviton model as a benchmark. Using both ℓ ℓ ℓ ℓ and ℓ ℓ j j events, an RS1 graviton with k/m¯ pl= 0.1 and mass between 325 and 845 GeV is excluded at 95% confidence level. In addition, the ℓ ℓ ℓ ℓ events are used to set a model-independent fiducial cross section limit of σ fid (p p→ X→ ZZ)< 0.92 pb at 95% confidence level for any new sources of ZZ production with m ZZ greater than 300 GeV.

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