Download or read book Search for Single Production of Scalar Leptoquarks in P Anti p Collisions Decaying Into Muons and Quarks with the D0 Detector written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for second generation leptoquarks (LQ2) which decay into a muon plus quark in p{bar p} collisions at a center-of-mass energy of √s = 1.96 TeV in the D0 detector using an integrated luminosity of about 300 pb−1. No evidence for a leptoquark signal is observed and an upper bound on the product of the cross section for single leptoquark production times branching fraction [beta] into a quark and a muon was determined for second generation scalar leptoquarks as a function of the leptoquark mass. This result has been combined with a previously published D0 search for leptoquark pair production to obtain leptoquark mass limits as a function of the leptoquark-muon-quark coupling, [lambda]. Assuming [lambda] = 1, lower limits on the mass of a second generation scalar leptoquark coupling to a u quark and a muon are m{sub LQ{sub 2}} > 274 GeV and m{sub LQ{sub 2}} > 226 GeV for [beta] = 1 and [beta] = 1/2, respectively.

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 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 First generation Scalar Leptoquarks in P Anti p Collisions at S 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.

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 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 [beta], where [beta] is the branching fraction for LQ → eq. The limits are 241 and 218 GeV/c2 for [beta] = 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.

Download or read book Search for Scalar Leptoquarks in the Acoplanar Jet Topology in P Anti p Collisions at S 1 2 written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for leptoquarks has been performed in 310 pb−1 of data from p{bar p} collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider. The topology analyzed consists of acoplanar jets with missing transverse energy. The data show good agreement with standard model expectations, and a lower mass limit of 136 GeV has been set at the 95% C.L. for a scalar leptoquark decaying exclusively into a quark and a neutrino.

Download or read book Search for Scalar Leptoquarks in the Acoplanar Jet Topology in P Anti p Collisions at S written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for leptoquarks has been performed in 310 pb−1 of data from p{bar p} collisions at a center-of-mass energy of 1.96 TeV, collected by the D0 detector at the Fermilab Tevatron Collider. The topology analyzed consists of acoplanar jets with missing transverse energy. The data show good agreement with standard model expectations, and a lower mass limit of 136 GeV has been set at the 95% C.L. for a scalar leptoquark decaying exclusively into a quark and a neutrino.

Download or read book Search for Pair Production of Second Generation Scalar Leptoquarks in P Anti p Collisions at S 1 2 written by and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report on a search for the pair production of second generation scalar leptoquarks (LQ2) in p{bar p} collisions at the center-of-mass energy √s = 1.96 TeV, using data corresponding to an integrated luminosity of 294 ± 19 pb−1 recorded with the D0 detector. No evidence for a leptoquark signal in the LQ2 {ovr LQ}2 → [mu]q[mu]q channel has been observed, and upper bounds on the product of cross section times branching fraction were set. This yields lower mass limits of m{sub LQ2} > 247 GeV for [beta] = [Beta](LQ{sub 2} → [mu]q) = 1 and m{sub LQ{sub 2}} > 182 GeV for [beta] = 1/2. Combining these limits with previous D0 results, the lower limits on the mass of a second generation scalar leptoquark are m{sub LQ{sub 2}} > 251 GeV and m{sub LQ{sub 2}} > 204 GeV for [beta] = 1 and [beta] = 1/2, respectively.

Download or read book Search for Single Production of Scalar Leptoquarks in Proton proton Collisions at S written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this paper, a search is presented for the production of both first- and second-generation scalar leptoquarks with a final state of either two electrons and one jet or two muons and one jet. The search is based on a data sample of proton-proton collisions at center-of-mass energy √s =8 TeV recorded with the CMS detector and corresponding to an integrated luminosity of 19.6 fb-1. Upper limits are set on both the first- and second-generation leptoquark production cross sections as functions of the leptoquark mass and the leptoquark couplings to a lepton and a quark. Results are compared with theoretical predictions to obtain lower limits on the leptoquark mass. At 95% confidence level, single production of first-generation leptoquarks with a coupling and branching fraction of 1.0 is excluded for masses below 1730 GeV, and second-generation leptoquarks with a coupling and branching fraction of 1.0 is excluded for masses below 530 GeV. Finally, these are the best overall limits on the production of first-generation leptoquarks to date.

Download or read book Search for First Generation Leptoquarks in Proton antiproton Collisions at the Center of Mass Energy written by Shaohua Fu and published by . This book was released on 2004 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Search for First Generation Leptoquarks in Proton antiproton Collisions at the Center of Mass Energy written by and published by . This book was released on 2004 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe a search for first generation leptoquarks decaying into the eejj final state in $p\bar{p}$ collisions at a center of mass energy of 1.96 TeV using the D0 detector at the Fermilab Tevatron. this search is based on data collected during 2002-2003 with an integrated luminosity of (130.4 =- 8.5) pb -1. Leptoquarks are assumed to be produced in pairs and to decay into an electron and a quark with a branching ration ?. We observe no evidence for leptoquarks, and set an upper cross section limit of 0.086 pb at the 95% confidence level corresponding to a lower mass limit of 231 GeV/c2 for scalar leptoquarks when ? = 1.

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 Search for pair produced scalar leptoquarks decaying into top quarks and muons at sqrt s written by Arne Christoph Reimers and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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 First and Second Generation Leptoquarks at written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: