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Direct Searches For Scalar Leptoquarks At The Run Ii Tevatron
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Book Synopsis Direct Searches for Scalar Leptoquarks at the Run II Tevatron by :
Download or read book Direct Searches for Scalar Leptoquarks at the Run II Tevatron written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation sets new limits on the mass of the scalar leptoquark from direct searches carried out at the Run II CDF detector using data from March 2001 to October 2003. The data analyzed has a total time-integrated measured luminosity of 198 pb[sup -1] of p[bar p] collisions with [radical]s = 1.96 TeV. Leptoquarks are assumed to be pair-produced and to decay into a lepton and a quark of the same generation. They consider two possible leptoquark decays: (1) [beta] = BR(LQ [yields] [mu]q) = 1.0, and (2) [beta] = BR(LQ [yields] [mu]q) = 0.5. For the [beta] = 1 channel, they focus on the signature represented by two isolated high-p[sub T] muons and two isolated high-p[sub T] jets. For the [beta] = 1/2 channel, they focus on the signature represented by one isolated high-p[sub T] muon, large missing transverse energy, and two isolated high-p[sub T] jets. No leptoquark signal is experimentally detected for either signature. Using the next to leading order theoretical cross section for scalar leptoquark production in p[bar p] collisions [1], they set new mass limits on second generation scalar leptoquarks. They exclude the existence of second generation scalar leptoquarks with masses below 221(175) GeV/c[sup 2] for the [beta] = 1(1/2) channels.
Book Synopsis Direct Searches for Scalar Leptoquarks at the Run II Tevatron by : Daniel Edward Ryan
Download or read book Direct Searches for Scalar Leptoquarks at the Run II Tevatron written by Daniel Edward Ryan and published by . This book was released on 2004 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation sets new limits on the mass of the scalar leptoquark from direct searches carried out at the Run II CDF detector using data from March 2001 to October 2003. The data analysed has a total time-integrated measured luminosity of 198 pb-1 of pp ̄ collisions with s = 1.96 TeV. Leptoquarks are assumed to be pair-produced and to decay into a lepton and a quark of the same generation. We consider two possible leptoquark decays: (1) beta = BR(LQ → muq ) = 1.0, and (2) beta = BR(LQ → muq ) = 0.5. For the beta = 1 channel, we focus on the signature represented by two isolated high-pT muons and two isolated high-pT jets. For the beta = 1/2 channel, we focus on the signature represented by one isolated high-pT muon, large missing transverse energy, and two isolated high-p T jets. No leptoquark signal is experimentally detected for either signature. Using the next to leading order theoretical cross section for scalar leptoquark production in pp ̄ collisions [1], we set new mass limits on second generation scalar leptoquarks. We exclude the existence of second generation scalar leptoquarks with masses below 221(175) GeV/c2 for the beta = 1(1/2) channels.
Book Synopsis Leptoquark Searches at the Tevatron by :
Download or read book Leptoquark Searches at the Tevatron written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent results of searches for leptoquarks at the two Tevatron collider experiments, CDF and D[null] at Fermilab. Described here are results from direct leptoquark searches in all three generations, and indirect searches for Pati-Salam leptoquarks using rare[ital B[sub s][sup 0]] and[ital B[sub d][sup 0]] decay signatures.
Book Synopsis Search for Pair Production of Second Generation Scalar Leptoquarks in Ppbar Collisions at the Tevatron by :
Download or read book Search for Pair Production of Second Generation Scalar Leptoquarks in Ppbar Collisions at the Tevatron written by and published by . This book was released on 2008 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: As predicted by numerous extensions of the Standard Model, leptoquarks (LQ) are hypothetical bosons allowing lepton-quark transitions. Under the assumption that they couple only to quarks and leptons of the same generation, three generations of leptoquarks can be distinguished. The search for the pair production of second generation scalar leptoquarks has been carried out in p{bar p} collisions at √s = 1.96TeV, using an integrated luminosity of 1 fb−1 collected by the D0 experiment at the Tevatron collider between August 2002 and February 2006. Topologies arising from the LQ{ovr LQ} → [mu]q[nu]q and LQ{ovr LQ} → [mu]q[mu]q decay modes have been investigated. In order to maximize the available statistics, a method for the combination of various prescaled triggers with an inclusive OR has been developed. Since no excess of data over the Standard Model prediction has been observed, upper limits on the leptoquark pair production cross section have been derived at 95% confidence level as function of the leptoquark mass and the branching fraction [beta] = Br(LQ → [mu]q), and are interpreted as lower limits on the leptoquark mass as function of [beta]. For [beta] = 1, [beta] = 1/2 and [beta] = 0.1, the combination of the two channels excludes scalar second generation leptoquarks with masses up to 309GeV, 262GeV, and 174GeV, respectively. The lower bounds on the scalar second generation leptoquark mass obtained for [beta] ≥ 0.1 are the best exclusion limits to date.
Book Synopsis Leptoquark Search at the Tevatron by : Raimund Strohmer
Download or read book Leptoquark Search at the Tevatron written by Raimund Strohmer and published by . This book was released on 2004 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: This article summarizes the status of the Tevatron Run II searches for leptoquarks in p{bar p} collisions at {radical}s = 1.96 TeV. The analyses discussed use datasets with integrated luminosities ranging from 72 pb{sup -1} to 200 pb{sup -1}.
Book Synopsis Search for Pair Production of Second Generation Scalar Leptoquarks in Pp̄ Collisions at the Tevatron by : Philippe Calfayan
Download or read book Search for Pair Production of Second Generation Scalar Leptoquarks in Pp̄ Collisions at the Tevatron written by Philippe Calfayan and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Searches for Leptoquarks at the Tevatron by :
Download or read book Searches for Leptoquarks at the Tevatron written by and published by . This book was released on 2008 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results for the different leptoquark searches that have been performed at the Tevatron Run II using both the CDF and the D0 detectors [1]. Emphasis will be put on the more recent searches in the jj[nu][nu] and jj[mu][nu] final states. The latest results for the other channels will be quoted for completeness.
Book Synopsis Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**1/2 by :
Download or read book Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results on a search for pair production of second generation scalar leptoquark in p{bar p} collisions at √s=1.96 TeV are reported. The data analyzed were collected by the CDF detector during the 2002-2003 Tevatron Run II and correspond to an integrated luminosity of 198 pb−1. Leptoquarks (LQ) are sought through their decay into (charged) leptons and quarks, with final state signatures represented by two muons and jets and one muon, large transverse missing energy and jets. We observe no evidence for LQ production and derive 95% C.L. upper limits on the LQ production cross sections as well as lower limits on their mass as a function of [beta], where [beta] is the branching fraction for LQ → [mu]q.
Book Synopsis Searches for Leptoquark Production and Compositeness at the Tevatron by :
Download or read book Searches for Leptoquark Production and Compositeness at the Tevatron written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent searches for leptoquark production and compositeness in p{bar p} collisions at (square root)s = 1.96TeV are presented using data samples with integrated luminosities up to 4fb−1 recorded with the D0 and CDF detectors at the Tevatron collider.
Book Synopsis Search for RPV Scalar Leptons at Tevatron by : Shan-Huei Chuang
Download or read book Search for RPV Scalar Leptons at Tevatron written by Shan-Huei Chuang and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We reviewed CDF and D0 searches for R-parity violation supersymmetry in leptons involved final states using up to 344 {+-} 21 pb{sup -1} Tevatron Run II data of p{bar p} collisions at {radical}s = 1.96 TeV. All the results were in good agreement with the Standard Model expectations. No evidence of new physics was observed. However, owing to the improvement on detectors, energy and luminosity from Run I to Run II, the limits for the existence of R-parity violation supersymmetry have been greatly advanced.
Book Synopsis Pair Production of Scalar Leptoquarks at the Tevatron by :
Download or read book Pair Production of Scalar Leptoquarks at the Tevatron written by and published by . This book was released on 1997 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**(1/2) by :
Download or read book Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**(1/2) written by and published by . This book was released on 2005 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for pair production of first-generation scalar leptoquarks (LQ) in pp collisions at √(s)=1.96 TeV using an integrated luminosity of 203 pb−1 collected at the Fermilab Tevatron collider by the CDF experiment. We observe no evidence for LQ production in the topologies arising from LQLQ→eqeq and LQLQ→eq?q, and derive 95% C.L. upper limits on the LQ production cross section. The results are combined with those obtained from a separately reported CDF search in the topology arising from LQLQ→?q?q and 95% C.L. lower limits on the LQ mass as a function of ?=BR(LQ→eq) are derived. The limits are 236, 205 and 145 GeV/c2 for ?=1, ?=0.5 and ?=0.1, respectively.
Book Synopsis Searches at the Run II Tevatron Collider by :
Download or read book Searches at the Run II Tevatron Collider written by and published by . This book was released on 2003 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Some initial results based on 40-90 pb−1 of integrated luminosity from Run II are presented for searches for new phenomena beyond the Standard Model, conducted at the upgraded Tevatron CDF and D0 experiments.
Book Synopsis Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư by :
Download or read book Search for Second-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư written by and published by . This book was released on 2005 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results on a search for pair production of second generation scalar leptoquark in p{bar p} collisions at √s=1.96 TeV are reported. The data analyzed were collected by the CDF detector during the 2002-2003 Tevatron Run II and correspond to an integrated luminosity of 198 pb−1. Leptoquarks (LQ) are sought through their decay into (charged) leptons and quarks, with final state signatures represented by two muons and jets and one muon, large transverse missing energy and jets. We observe no evidence for LQ production and derive 95% C.L. upper limits on the LQ production cross sections as well as lower limits on their mass as a function of?, where? is the branching fraction for LQ →?q.
Book Synopsis Search for Leptoquarks and Technicolor at the Tevatron by :
Download or read book Search for Leptoquarks and Technicolor at the Tevatron written by and published by . This book was released on 2010 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: This note summarizes results on leptoquarks and technicolor searches at the Tevatron with a more particular focus on recent ones. Results on leptoquark pair production with leptoquark decays to q[nu], qe, q[mu] and q[tau] are given for an analysed luminosity up to 5.2 fb−1. In most analyses, both leptoquarks decay identically leading to signatures of jets and missing transverse momentum or jets and charged leptons. Technicolor results are given with a particular emphasis on technirho decaying toWZ in a trilepton signature and on technirho decaying to aW and a technipion.
Book Synopsis Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư by :
Download or read book Search for First-generation Scalar Leptoquarks in P Anti-p Collisions at S**ư written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report on a search for pair production of first-generation scalar leptoquarks (LQ) in p{bar p} collisions at √s = 1.96 TeV using an integrated luminosity of 252 pb−1 collected at the Fermilab Tevatron collider by the D0 detector. They observe no evidence for LQ production in the topologies arising from LQ{ovr LQ} → eqeq and LQ{ovr LQ} → eqvq, and derive 95% C.L. lower limits on the LQ mass as a function of?, where? is the branching fraction for LQ → eq. The limits are 241 and 218 GeV/c2 for? = 1 and 0.5, respectively. These results are combined with those obtained by D0 at √s = 1.8 TeV, which increases these LQ mass limits to 256 and 234 GeV/c2.
Book Synopsis A Search for Scalar Leptoquarks in by :
Download or read book A Search for Scalar Leptoquarks in written by and published by . This book was released on 1992 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search has been made using the data from the first run of the D0 detector at the Fermilab Tevatron for pair production of scalar leptoquarks, each decaying into electron plus quark (visible in the detector as electron plus jet). From a data sample representing 841 nb[sup [minus]1], a limit of 74 GeV at 95% confidence level can be set on the mass of the first generation scalar leptoquark, for a particular calculation of the production cross section and a 100% branching fraction into electron plus quark.
