Search For The Production Of Scalar Bottom Quarks In P(P)Over-Bar Collisions At Root S=1.96 Tev

T. Aaltonen,J. Adelman,B. Álvarez González,S. Amerio, D. Amidei, A. Anastassov,A. Annovi, J. Antos, G. Apollinari, A. Apresyan,T. Arisawa,A. Artikov,J. Asaadi,W. Ashmanskas,A. Attal,A. Aurisano, F. Azfar,W. Badgett, A. Barbaro-Galtieri,V. Barnes,B. Barnett,P. Barria,P. Bartos,G. Bauer,P.-H. Beauchemin,F. Bedeschi,D. Beecher,S. Behari, G. Bellettini, J. Bellinger,D. Benjamin, A. Beretvas,A. Bhatti,M. Binkley, D. Bisello, I. Bizjak,R. Blair,C. Blocker, B. Blumenfeld, A. Bocci,A. Bodek, V. Boisvert, D. Bortoletto,J. Boudreau, A. Boveia, B. Brau,A. Bridgeman, L. Brigliadori,C. Bromberg,E. Brubaker, J. Budagov,H. Budd,S. Budd, K. Burkett,G. Busetto, P. Bussey,A. Buzatu,K. Byrum,S. Cabrera,C. Calancha,S. Camarda,M. Campanelli,M. Campbell,F. Canelli, A. Canepa,B. Carls, D. Carlsmith,R. Carosi,S. Carrillo,S. Carron, B. Casal,M. Casarsa,A. Castro,P. Catastini, D. Cauz,V. Cavaliere, M. Cavalli-Sforza,A. Cerri, L. Cerrito,S. Chang,Y. Chen, M. Chertok,G. Chiarelli,G. Chlachidze, F. Chlebana,K. 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PHYSICAL REVIEW LETTERS（2010）

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摘要

We report on a search for direct scalar bottom quark (sbottom) pair production in p (p) over bar collisions at root s = 1.96 TeV, in events with large missing transverse energy and two jets of hadrons in the final state, where at least one of the jets is required to be identified as originating from a b quark. The study uses a collider detector at Fermilab Run II data sample corresponding to 2.65 fb(-1) of integrated luminosity. The data are in agreement with the standard model. In an R-parity conserving minimal supersymmetric scenario, and assuming that the sbottom decays exclusively into a bottom quark and a neutralino, 95% confidence-level upper limits on the sbottom pair production cross section of 0.1 pb are obtained. For neutralino masses below 70 GeV/c(2), sbottom masses up to 230 GeV/c(2) are excluded at 95% confidence level.

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cross section,elementary particles,standard model,confidence level

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