Search for a narrow tt̄ resonance in pp̄ collisions at √s=1.96TeV

V. M. Abazov,Brad Abbott,B. S. Acharya,M. R. Adams,Todd Adams, G. D. Alexeev, G. Alkhazov, A. Alton,George Alverson,Gilvan Alves,M. Aoki,Andrew Askew, B. Åsman, S. Atkins, O. Atramentov,Kamil Augsten,Carlos Avila, J. Backusmayes, F. Badaud, L. Bagby, B. Baldin, D. V. Bandurin, S. Banerjee,Emanuela Barberis,Philip Baringer, J. Barreto,J. F. Bartlett,U. Bassler, V. E. Bazterra,Alice Bean,Marcia Begalli,C. Belanger-Champagne, L. Bellantoni,Suman Bala Beri,G. Bernardi, R. Bernhard,Iain Alexander Bertram,Marc Besancon,R. Beuselinck,V. A. Bezzubov,Pushpalatha C Bhat,Vipin Bhatnagar,G. C. Blazey,S. Blessing,Kenneth Bloom, A. Boehnlein, D. Boline, E. E. Boos,Guennadi Borissov,Tulika Bose,Andrew Brandt,Oleg Brandt,Raymond Brock,Gustaaf Brooijmans, A. Bross,D. Brown,J. Brown,X. B. Bu, M. Buehler,Volker Buescher,V. Bunichev,Sergey Burdin,T. H. Burnett, C. P. Buszello, B. Calpas,E. Camacho-Pérez, M. A. Carrasco-Lizarraga, B. C.K. Casey,Heriberto Castilla-Valdez, S. Chakrabarti, D. Chakraborty,K. M. Chan, A. Chandra,Emilien Chapon,Guo-Ming Chen,S. Chevalier-Théry, D. K. Cho, S. W. Cho,S. Choi,Brajesh C Choudhary, S. Cihangir, D. R. Claes, J. Clutter,M. Cooke,W. E. Cooper,M. D. Corcoran,Fabrice Couderc, M. C. Cousinou, A. Croc, D. Cutts,A. Das,Gavin Davies,Kaushik De,S. J. De Jong,E. De La Cruz-Burelo,Frederic Deliot,Regina Demina, D. Denisov

Physical Review D（2012）

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摘要

We report a search for a narrow ttbar resonance that decays into a lepton+jets final state based on an integrated luminosity of 5.3/fb of proton-antiproton collisions at sqrt{s}=1.96 TeV collected by the D0 Collaboration at the Fermilab Tevatron Collider. We set upper limits on the production cross section of such a resonance multiplied by its branching fraction to ttbar which we compare to predictions for a leptophobic topcolor Z' boson. We exclude such a resonance at the 95% confidence level for masses below 835 GeV.

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