Search for First Generation Leptoquarks in Proton-antiproton Collisions at the Center of Mass Energy PDF Download
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Author: Shaohua Fu
Publisher:
ISBN:
Category :
Languages : en
Pages : 189
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Author: Shaohua Fu
Publisher:
ISBN:
Category :
Languages : en
Pages : 189
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Author: Guoliang Wang
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Category : Collisions (Nuclear physics)
Languages : en
Pages : 302
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 189
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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.
Author: Dmitri Tsybychev
Publisher:
ISBN:
Category : Proton-antiproton colliders
Languages : en
Pages : 358
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Category :
Languages : en
Pages :
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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.
Author:
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Category :
Languages : en
Pages : 41
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A search for pair production of third-generation scalar leptoquarks decaying to top quark and $\tau$ lepton pairs is presented using proton-proton collision data at a center-of-mass energy of $\sqrt{s}$ = 8 TeV collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 19.7 fb-1. The search is performed using events that contain an electron or a muon, a hadronically decaying $\tau$ lepton, and two or more jets. The observations are found to be consistent with the standard model predictions. Assuming that all leptoquarks decay to a top quark and a $\tau$ lepton, the existence of pair produced, charge -1/3, third-generation leptoquarks up to a mass of 685 GeV is excluded at 95% confidence level. This result constitutes the first direct limit for leptoquarks decaying into a top quark and a $\tau$ lepton, and may also be applied directly to the pair production of bottom squarks decaying predominantly via the R-parity violating coupling [lambda]' 333.
Author:
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Category :
Languages : en
Pages : 48
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Our search for pair production of first and second generation leptoquarks is performed in final states containing either two charged leptons and two jets, or one charged lepton, one neutrino and two jets, using proton-proton collision data at √s = 8 TeV. The data, corresponding to an integrated luminosity of 19.7 fb-1, were recorded with the CMS detector at the LHC. First-generation scalar leptoquarks with masses less than 1010 (850) GeV are excluded for [beta] = 1.0 (0.5), where b is the branching fraction of a leptoquark decaying to a charged lepton and a quark. Similarly, secondgeneration scalar leptoquarks with masses less than 1080 (760) GeV are excluded for [beta] = 1.0 (0.5). Furthermore, mass limits are also set for vector leptoquark production scenarios with anomalous vector couplings, and for R-parity violating supersymmetric scenarios of top squark pair production resulting in similar final-state signatures. These are the most stringent limits placed on the masses of leptoquarks and RPV top squarks to date.
![A Search for Generation-1 Leptoquarks in Proton-antiproton Collisions at [square Root]s PDF](https://books.google.com/books/content/images/frontcover/xs9rNwAACAAJ?fife=w80-h100)
Author: Steven M. Moulding
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ISBN:
Category : Leptons (Nuclear physics)
Languages : en
Pages : 193
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Author: Ira Joseph Kroll
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ISBN:
Category : Heavy particles (Nuclear physics)
Languages : en
Pages : 288
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Author:
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ISBN:
Category :
Languages : en
Pages : 112
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The CDF experiment has searched for production of a third generation vector leptoquark (VLQ3) in the di-tau plus di-jet channel using 322 pb−1 of Run II data. We review the production and decay theory and describe the VLQ3 model we have used as a benchmark. We study the analysis, including the data sample, triggers, particle identification, and event selection. We also discuss background estimates and systematic uncertainties. We have found no evidence for VLQ3 production and have set a 95% C.L. upper limit on the pair production cross section [sigma] to 344 fb, and exclude VLQ3 in the mass range m{sub VLQ3}> 317 GeV/c2, assuming Yang-Mills couplings and Br(LQ3 2!b[tau]) = 1. If theoretical uncertainties on the cross section are taken into account, the results are [sigma] 353 fb and m{sub VLQ3} 303 GeV/c2. For a VLQ3 with Minimal couplings, the upper limit on the cross section is [sigma] 493 fb ([sigma] 554 fb) and the lower limit on the mass is m{sub VLQ3} 251 GeV/c2 (m{sub VLQ3} 235 GeV/c2) for the nominal (1[sigma] varied) theoretical expectation.
