Search For 3rd Generation Vector Leptoquarks In The Di Tau Di Jet Channel In Proton Antiproton Collisions At Square Root S
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Search For 3rd Generation Vector Leptoquarks In The Di Tau Di Jet Channel In Pp Collisions At Square Root Of S
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Author : Stanley Scott Forrester
language : en
Publisher:
Release Date : 2006
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Search For 3rd Generation Vector Leptoquarks In The Di Tau Di Jet Channel In Proton Antiproton Collisions At Square Root S
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Author : Stanley Scott Forrester
language : en
Publisher:
Release Date : 2006
Search For 3rd Generation Vector Leptoquarks In The Di Tau Di Jet Channel In Proton Antiproton Collisions At Square Root S written by Stanley Scott Forrester and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
We search for third generation vector leptoquarks (V LQ3) produced in colliding p{bar p} beams operating at {radical}s = 1.96 TeV at the CDF experiment in Run II of the Fermilab Tevatron. We use 322 pb{sup -1} of data to search for the V LQ3 signal in the di-tau plus di-jet channel. For the first time, the full matrix element is used in the Monte Carlo simulation of this signal. With no events observed in the signal region, we set a 95% C.L. upper limit on the V LQ3 pair production cross section of {sigma} 344fb, assuming Yang-Mills couplings and Br(V LQ3 {yields} b{tau}) = 1, and a lower limit on the V LQ3 mass of m{sub V LQ3} 317 GeV=c{sup 2}. If theoretical uncertainties on the cross section are applied in the least favorable manner the results are {sigma} 360fb and m{sub V LQ3} 294 GeV=c{sup 2}. The Minimal coupling V LQ3 result is an upper limit on the cross section of {sigma} 493fb ({sigma} 610fb) and the lower limit on the mass is m{sub V LQ3} 251 GeV=c{sup 2} (m{sub V LQ3} 223 GeV=c{sup 2}) for the nominal (1{sigma} varied) theoretical expectation.
Search For 3rd Generation Vector Leptoquarks In The Di Tau Di Jet Channel In Proton Antiproton Collisions At Square U221a S
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Author :
language : en
Publisher:
Release Date : 2006
Search For 3rd Generation Vector Leptoquarks In The Di Tau Di Jet Channel In Proton Antiproton Collisions At Square U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
We search for third generation vector leptoquarks (V LQ3) produced in colliding p$ar{p}$ beams operating at √s = 1.96 TeV at the CDF experiment in Run II of the Fermilab Tevatron. We use 322 pb-1 of data to search for the V LQ3 signal in the di-tau plus di-jet channel. For the first time, the full matrix element is used in the Monte Carlo simulation of this signal. With no events observed in the signal region, we set a 95% C.L. upper limit on the V LQ3 pair production cross section of ? 344fb, assuming Yang-Mills couplings and Br(V LQ3 → b?) = 1, and a lower limit on the V LQ3 mass of msubV LQ3/sub 317 GeV=c2. If theoretical uncertainties on the cross section are applied in the least favorable manner the results are ? 360fb and msubV LQ3/sub 294 GeV=c2. The Minimal coupling V LQ3 result is an upper limit on the cross section of ? 493fb (? 610fb) and the lower limit on the mass is msubV LQ3/sub 251 GeV=csup2/sup (msubV LQ3/sub 223 GeV=c2) for the nominal (1? varied) theoretical expectation.
Search For Third Generation Vector Leptoquarks In 1 96 Tev Proton Antiproton Collisions
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Author :
language : en
Publisher:
Release Date : 2007
Search For Third Generation Vector Leptoquarks In 1 96 Tev Proton Antiproton Collisions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
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.
Search For Third Generation Scalar Leptoquarks In The T Tau Channel In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Third Generation Scalar Leptoquarks In The T Tau Channel In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
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.
Search For The Third Generation Scalar Leptoquarks And Heavy Right Handed Neutrinos In Final States With Two Tau Leptons And Two Jets In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2017
Search For The Third Generation Scalar Leptoquarks And Heavy Right Handed Neutrinos In Final States With Two Tau Leptons And Two Jets In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
A search is performed for third-generation scalar leptoquarks and heavy right-handed neutrinos in events containing one electron or muon, one hadronically decaying tau lepton, and at least two jets, using a $\sqrt{s}$=13 TeV pp collision data sample corresponding to an integrated luminosity of 12.9 inverse femtobarns collected with the CMS detector at the LHC in 2016. The number of observed events is found to be in agreement with the standard model prediction. A limit is set at 95% confidence level on the product of the leptoquark pair production cross section and beta squared where beta is the branching fraction of leptoquark decay to a tau lepton and a bottom quark. Assuming beta=1, third-generation leptoquarks with masses below 850 GeV are excluded at 95 % confidence level. An additional search based on the same event topology involves heavy right-handed neutrinos, N[R], and right-handed W bosons, W[R], arising in a left-right symmetric extension of the standard model. In this search, W[R] bosons are assumed to decay to a tau lepton and N[R] followed by the decay of the N[R] to a tau lepton and an off-shell W[R] boson. Assuming the mass of the right-handed neutrino to be half of the mass of the right-handed W boson, W[R] boson masses below 2.9 TeV are excluded at 95 % confidence level. These results improve on the limits from previous searches for third-generation leptoquarks and heavy right-handed neutrinos with tau leptons in the final state.
A Search For Generation 1 Leptoquarks In Proton Antiproton Collisions At Square Root S
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Author : Steven M. Moulding
language : en
Publisher:
Release Date : 1993
A Search For Generation 1 Leptoquarks In Proton Antiproton Collisions At Square Root S written by Steven M. Moulding and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Leptons (Nuclear physics) categories.
Search For First Generation Scalar Leptoquarks In The Evjj Channel In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Search For First Generation Scalar Leptoquarks In The Evjj Channel In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
A search for pair-production of first generation scalar leptoquarks is performed in the final state containing an electron, a neutrino, and at least two jets using proton-proton collision data at sqrt(s)=7 TeV. The data were collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 36 inverse picobarns. The number of observed events is in good agreement with the predictions for standard model processes. Prior CMS results in the dielectron channel are combined with this electron+neutrino search. A 95% confidence level combined lower limit is set on the mass of a first generation scalar leptoquark at 340 GeV for beta=0.5, where beta is the branching fraction of the leptoquark to an electron and a quark. These results represent the most stringent direct limits to date for values of beta greater than 0.05.
Seach For Second Generation Leptoquarks In Proton Anti Proton Collisions
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Author : Tim U. Christiansen
language : en
Publisher:
Release Date : 2003
Seach For Second Generation Leptoquarks In Proton Anti Proton Collisions written by Tim U. Christiansen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
This document describes the search for second-generation leptoquarks (LQ{sub 2}) in around 114pb{sup -1} of p{bar p} collisions, recorded with the D0 detector between September 2002 and June 2003 at a centre-of-mass energy of {radical}s = 1.96TeV. The predictions of the Standard Model and models including scalar leptoquark production are compared to the data for various kinematic distributions. Since no excess of data over the Standard Model prediction has been observed, a lower limit on the leptoquark mass of M{sub LQ{sub 2}}{sup {beta}=1}> 200GeV has been calculated at 95% confidence level (C.L.), assuming a branching fraction of {beta} = BF(LQ{sub 2} {yields} {mu}j) = 100% into a charged lepton and a quark. The corresponding limit for {beta} = 1/2 is M{sub LQ{sub 2}}{sup {beta}=1/2}> 152 GeV. Finally, the results were combined with those from the search in the same channel at D0 Run I. This combination yields the exclusion limit of M{sub LQ{sub 2}}{sup {beta}=1}> 222 GeV (177GeV) for (beta) = 1 (1/2) at 95% C.L., which is the best exclusion limit for scalar second-generation leptoquarks (for {beta} = 1) from a single experiment to date.
Search For Third Generation Vector Leptoquarks In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2007
Search For Third Generation Vector Leptoquarks In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.