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.
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.
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.
Download or read book Search for 3rd Generation Vector Leptoquarks in the Di tau Di jet Channel in Pp Collisions at square Root Of S written by Stanley Scott Forrester and published by . This book was released on 2006 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Second generation Scalar Leptoquarks in P Anti p Collisions at S 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.
Download or read book Search for Pair Production of Second Generation Scalar Leptoquarks in Pp 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:
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}.
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.
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.
Download or read book Fundamental Interactions written by A. Astbury and published by World Scientific. This book was released on 2006 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains the latest developments in particle physics in collider experiments. The contributions cover new results such as the production of quark-gluon plasma in the heavy-ion collider, the new techniques for precision measurement at low energies, and the status of neutrino physics at various laboratories including the new facilities that are at the planning stage. Sample Chapter(s). Chapter 1: Making Precision Measurements at Hadron Colliders: Two Lectures (1,408 KB). Contents: Making Precision Measurements at Hadron Colliders: Two Lectures (H J Frisch); Evidence for a QuarkOCoGluon Plasma at RHC (J Harris); Neutrino Physics: A Selective Overview (S Oser); Low-Energy Tests of the Standard Model (M Pospelov); Leptonic B Decays (M-C Chang); Cosmic Neutrinos Beyond the Standard Model (U Harbach); Proton Structure from HERA (K Nagano); New Phenomena Searches at CDF (A Soha); Electroweak Results at LEP2 (P Spagnolo); and other papers. Readership: Graduate students, academics and researchers in particle and nuclear physics."
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.
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.
Download or read book Exotic Physics written by D. Acosta and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for the pair production of scalar leptoquarks, LQ, using 191 pb{sup -1} of proton-antiproton collision data recorded by the CDF experiment during Run II of the Tevatron. The leptoquarks are sought via their decay into a neutrino and quark yielding missing transverse energy and several jets of large transverse energy. No evidence for leptoquark production is observed, and limits are set on {sigma}(p{bar p} {yields} LQ{ovr OQ}X {yields} v{bar v}q{bar q}X). Using a next-to-leading order theoretical prediction of the cross section for scalar leptoquark production, we exclude first-generation leptoquarks in the mass interval 78 to 117 GeV/c{sup 2} at the 95% confidence level for BR(LQ {yields} vq) = 100%.
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.
Download or read book Fundamental Interactions Proceedings Of The 21st Lake Louise Winter Institute written by Alan Astbury and published by World Scientific. This book was released on 2006-12-29 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains the latest developments in particle physics in collider experiments. The contributions cover new results such as the production of quark-gluon plasma in the heavy-ion collider, the new techniques for precision measurement at low energies, and the status of neutrino physics at various laboratories including the new facilities that are at the planning stage.
Download or read book Deep Inelastic Scattering written by Masahiro Kuze and published by World Scientific. This book was released on 2007 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings present the most up-to-date status of deep inelastic scattering (DIS) physics. Topics such as structure function measurements and phenomenology, quantum chromodynamics (QCD) studies in DIS and photoproduction, spin physics and diffractive interactions are reviewed in detail, with emphasis on those studies that push the test of QCD and the Standard Model to the limits of their present range of validity, towards both the very high and the very low four-momentum transfers in leptonproton scattering.
Download or read book Proceedings Of The 28th International Conference On High Energy Physics In 2 Volumes written by Zygmunt Ajduk and published by World Scientific. This book was released on 1997-04-11 with total page 1878 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 28th conference from the Rochester series was the major high energy physics conference in 1996. Volume one contains short reports on new theoretical and experimental results. Volume two consists of the review talks presented in the plenary sessions.
