Search For Heavy Down Type Vector Like Quarks In The Lepton Plus Jets Final State In 8 Tev Proton Proton Collisions Using The Atlas Detector At The Lhc
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Search For Heavy Down Type Vector Like Quarks In The Lepton Plus Jets Final State In 8 Tev Proton Proton Collisions Using The Atlas Detector At The Lhc
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Author : Diedi Hu
language : en
Publisher:
Release Date : 2015
Search For Heavy Down Type Vector Like Quarks In The Lepton Plus Jets Final State In 8 Tev Proton Proton Collisions Using The Atlas Detector At The Lhc written by Diedi Hu 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.
In the chiral B scenario with a 100% branching ratio of the decay B->Wt, the observed (expected) 95% CL lower limit on the B mass is 814 GeV (756 GeV).
Search For Vector Like T Quarks Using Events With Oppositely Charged Lepton Pairs And Jets In Proton Proton Collisions At Centre Of Mass Energy Of 13 Tev With Cms Detector
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Author : Dalath Rachitha Asanga Mendis
language : en
Publisher:
Release Date : 2019
Search For Vector Like T Quarks Using Events With Oppositely Charged Lepton Pairs And Jets In Proton Proton Collisions At Centre Of Mass Energy Of 13 Tev With Cms Detector written by Dalath Rachitha Asanga Mendis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
A search is performed for heavy vector-like top quark partner (T) with electric charge +2/3 by using proton-proton collision events from Large Hadron Collider (LHC) at a centre- of-mass energy of 13 TeV. The data corresponds to an integrated luminosity of 35.9fb−1 collected by the Compact Muon Solenoid (CMS) experiment during 2016. The production of this new hypothetical particle is assumed to be in pairs and strong interaction is responsible for such production mechanism. T quarks can decay to various combinations of third generation quarks and standard model bosons: T → bW, tZ, or tH, and hence the final states consist of pair of opposite-sign leptons consistent with coming from a Z boson and jets. No significant excess has been observed and hence 95% CL upper limits are obtained on TT production cross section by assuming different branching ratios. T quark mass values below 1280 GeV are excluded in case of 100% branching fraction for T → tZ.
Search For W U2192 Tb U00af In The Lepton Plus Jets Final State In Proton Proton Collisions At A Centre Of Mass Energy Of U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For W U2192 Tb U00af In The Lepton Plus Jets Final State In Proton Proton Collisions At A Centre Of Mass Energy Of 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 2015 with categories.
In this study, a search for new charged massive gauge bosons, called W', is performed with the ATLAS detector at the LHC, in proton–proton collisions at a centre-of-mass energy of √s=8 TeV, using a dataset corresponding to an integrated luminosity of 20.3 fb-1. This analysis searches for W' bosons in the W' → tb¯ decay channel in final states with electrons or muons, using a multivariate method based on boosted decision trees. The search covers masses between 0.5 and 3.0 TeV, for right-handed or left-handed W' bosons. No significant deviation from the Standard Model expectation is observed and limits are set on the W' → tb¯ cross-section times branching ratio and on the W'-boson effective couplings as a function of the W'-boson mass using the CLs procedure. For a left-handed (right-handed) W' boson, masses below 1.70 (1.92) TeV are excluded at 95% confidence level.
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.
Search For Type Iii Seesaw Heavy Leptons In Leptonic Final States In Pp Collisions At Square Root S
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For Type Iii Seesaw Heavy Leptons In Leptonic Final States In Pp Collisions At Square Root S written by [Study Group] ATLAS Collaboration CERN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with categories.
Abstract: A search for the pair production of heavy leptons as predicted by the type-III seesaw mechanism is presented. The search uses proton-proton collision data at a centre-of-mass energy of 13 TeV, corresponding to 139fb−1 of integrated luminosity recorded by the ATLAS detector during Run 2 of the Large Hadron Collider. The analysis focuses on final states with three or four electrons or muons from the possible decays of new heavy leptons via intermediate electroweak bosons. No significant deviations above the Standard Model expectation are observed; upper and lower limits on the heavy lepton production cross-section and masses are derived respectively. These results are then combined for the first time with the ones already published by ATLAS using the channel with two leptons in the final state. The observed lower limit on the mass of the type-III seesaw heavy leptons combining two, three and four lepton channels together is 910 GeV at the 95% confidence level
Measurement Of The Top Pair Production Cross Section In 8 Tev Proton Proton Collisions Using Kinematic Information In The Lepton Jets Final State With Atlas
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of The Top Pair Production Cross Section In 8 Tev Proton Proton Collisions Using Kinematic Information In The Lepton Jets Final State With Atlas 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.
Search For A Heavy Top Like Quark In P Bar P Collisions At Surd S
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Author :
language : en
Publisher:
Release Date : 2011
Search For A Heavy Top Like Quark In P Bar P Collisions At Surd 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.
We present the results of a search for pair production of a heavy top-like (t') quark decaying to W q final states using data corresponding to an integrated luminosity of 5.6 fb−1 collected by the CDF II detector in p{anti p} collisions at √{ovr s} = 1.96 TeV. We perform parallel searches for t' → W b and t' → W q (where q is a generic down-type quark) in events containing a lepton and four or more jets. By performing a fit to the two-dimensional distribution of total transverse energy versus reconstructed t' quark mass, we set upper limits on the t'{anti t}' production cross section and exclude a standard model fourth-generation t' quark decaying to W b (W q) with mass below 358 (340) GeV/c2 at 95% CL.
Search For Tev Scale Gravity Signatures In High Mass Final States With Leptons And Jets With The Atlas Detector At U221a S
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Author :
language : en
Publisher:
Release Date : 2016
Search For Tev Scale Gravity Signatures In High Mass Final States With Leptons And Jets With The Atlas Detector At 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 2016 with categories.
In this paper, a search for physics beyond the Standard Model, in final states with at least one high transverse momentum charged lepton (electron or muon) and two additional high transverse momentum leptons or jets, is performed using 3.2 fb-1 of proton–proton collision data recorded by the ATLAS detector at the Large Hadron Collider in 2015 at √s=13 TeV. The upper end of the distribution of the scalar sum of the transverse momenta of leptons and jets is sensitive to the production of high-mass objects. No excess of events beyond Standard Model predictions is observed. Finally, exclusion limits are set for models of microscopic black holes with two to six extra dimensions.
Search For Type Iii Seesaw Heavy Leptons In Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Type Iii Seesaw Heavy Leptons In Collisions At 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 2015 with categories.
A search for the pair production of heavy leptons (N0,L±) predicted by the type-III seesaw theory formulated to explain the origin of small neutrino masses is presented. The decay channels N0 → W±l∓ (l = e,?,?) and L± → W±? (? = ?e,??,??) are considered. The analysis is performed using the final state that contains two leptons (electrons or muons), two jets from a hadronically decaying W boson and large missing transverse momentum. The data used in the measurement correspond to an integrated luminosity of 20.3 fb–1 of ?? collisions at √s = 8 TeV collected by the ATLAS detector at the LHC. No evidence of heavy lepton pair production is observed. Heavy leptons with masses below 325–540 GeV are excluded at the 95% confidence level, depending on the theoretical scenario considered.
Search For Vector Like Charge 2 3 T Quarks In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Search For Vector Like Charge 2 3 T Quarks 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.
Our search for fermionic top quark partners T of charge 2/3 is presented. The search is carried out in proton-proton collisions corresponding to an integrated luminosity of 19.7 fb-1 collected at a center-of-mass energy of √s = 8 TeV with the CMS detector at the LHC. The T quarks are assumed to be produced strongly in pairs and can decay into tH, tZ, and bW. The search is performed in five exclusive channels: a singlelepton channel, a multilepton channel, two all-hadronic channels optimized either for the bW or the tH decay, and one channel in which the Higgs boson decays into two photons. The results are found to be compatible with the standard model expectations in all the investigated final states. Finally, a statistical combination of these results is performed and lower limits on the T quark mass are set. Depending on the branching fractions, lower mass limits between 720 and 920 GeV at 95% confidence level are found. These are among the strongest limits on vector-like T quarks obtained to date.