A Search For The Single Production Of Vector Like Quarks Decaying To A W Boson And A B Quark In The Leptonic Final State With The Atlas Detector
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Theoretical Physics To Face The Challenge Of Lhc
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Author : Laurent Baulieu
language : en
Publisher: Lecture Notes of the Les Houch
Release Date : 2015
Theoretical Physics To Face The Challenge Of Lhc written by Laurent Baulieu and has been published by Lecture Notes of the Les Houch this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Science categories.
The book gathers the lecture notes of the Les Houches Summer School that was held in August 2011 for an audience of advanced graduate students and post-doctoral fellows in particle physics, theoretical physics, and cosmology, areas where new experimental results were on the verge of being discovered at CERN. Every Les Houches School has its own distinct character. This one was held during a summer of great anticipation that at any moment contact might be made with the most recent theories of the nature of the fundamental forces and the structure of space-time. In fact, during the session, the long anticipated discovery of the Higgs particle was announced. The book vividly describes the fruitful and healthy "schizophrenia" that is the rule among the community of theoreticians who have split into several components: those doing phenomenology, and those dealing with highly theoretical problems, with a few trying to bridge both domains. The lectures by theoreticians covered many directions in the theory of elementary particles, from classics such as the Supersymmetric Standard Model to very recent ideas such as the relation between black holes, hydrodynamics, and gauge-gravity duality. The lectures by experimentalists explained in detail how intensively and how precisely the LHC collider has verified the theoretical predictions of the Standard Model, predictions that were at the front lines of experimental discovery during the 70's, 80's and 90's, and how the LHC is ready to make new discoveries. They described many of the ingenious and pioneering techniques developed at CERN for the detection and the data analysis of billions of billions of proton-proton collisions.
A Search For The Single Production Of Vector Like Quarks Decaying To A W Boson And A B Quark In The Leptonic Final State With The Atlas Detector
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Author : Ferdinand Schenck
language : en
Publisher:
Release Date : 2023*
A Search For The Single Production Of Vector Like Quarks Decaying To A W Boson And A B Quark In The Leptonic Final State With The Atlas Detector written by Ferdinand Schenck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023* with categories.
Search For Single Production Of Vector Like Quarks Decaying Into A B Quark And A W Boson In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2017
Search For Single Production Of Vector Like Quarks Decaying Into A B Quark And A W Boson 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 presented for a heavy vector-like quark, decaying into a b quark and a W boson, which is produced singly in association with a light flavor quark and a b quark. The analysis is performed using a data sample of proton-proton collisions at a center-of-mass energy of $\sqrt{s} = $ 13 TeV collected at the LHC in 2015. The data set used in the analysis corresponds to an integrated luminosity of 2.3 inverse-femtobarns. The search is carried out using events containing one electron or muon, at least one b-tagged jet with large transverse momentum, at least one jet in the forward region of the detector, and missing transverse momentum. No excess over the standard model prediction is observed. Upper limits are placed on the production cross section of heavy exotic quarks: a T quark with a charge of 2/3, and a Y quark with a charge of -4/3. For Y quarks with coupling of 0.5 and B(Y to bW) = 100%, the observed (expected) lower mass limits are 1.40 (1.0) TeV. This is the most stringent limit to date on the single production of the Y vector-like quark.
Search For Single Production Of A Heavy Vector Like T Quark Decaying To A Higgs Boson And A Top Quark With A Lepton And Jets In The Final State
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Author :
language : en
Publisher:
Release Date : 2016
Search For Single Production Of A Heavy Vector Like T Quark Decaying To A Higgs Boson And A Top Quark With A Lepton And Jets In The Final State 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.
A search for single production of vector-like top quark partners (T) decaying into a Higgs boson and a top quark is performed using data from pp collisions at a centre-of-mass energy of 13 TeV collected by the CMS experiment at the CERN LHC, corresponding to an integrated luminosity of 2.3 inverse femtobarns. The top quark decay includes an electron or a muon while the Higgs boson decays into a pair of b quarks. No significant excess over standard model backgrounds is observed. Exclusion limits on the product of the production cross section and the branching fraction are derived in the T quark mass range 700 to 1800 GeV. For a mass of 1000 GeV, values of the product of the production cross section and the branching fraction greater than 0.8 and 0.7 pb are excluded at 95% confidence level, assuming left- and right-handed coupling of the T quark to standard model particles, respectively. This is the first analysis setting exclusion limits on the cross section of singly produced vector-like T quarks at a centre-of-mass energy of 13 TeV.
Search For Single Production Of A Vectorlike T Quark Decaying Into A Higgs Boson And Top Quark With Fully Hadronic Final States Using The Atlas Detector
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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022
Search For Single Production Of A Vectorlike T Quark Decaying Into A Higgs Boson And Top Quark With Fully Hadronic Final States Using The Atlas Detector 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.
Search For A Vector Like Quark T Decaying Into Top Higgs In Single Production Mode In Full Hadronic Final State Using Cms Data Collected At 8 Tev
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Author : José David Ruiz Alvarez
language : en
Publisher:
Release Date : 2015
Search For A Vector Like Quark T Decaying Into Top Higgs In Single Production Mode In Full Hadronic Final State Using Cms Data Collected At 8 Tev written by José David Ruiz Alvarez 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.
During 2012, the Large Hadron Collider (LHC) has delivered proton-proton collisions at 8 TeV center of mass energy to the ATLAS and CMS experiments. These two experiments have been designed to discover the Higgs boson and to search for new particles predicted by several theoretical models, as supersymmetry. The Higgs boson has been discovered by ATLAS and CMS experiments on July, 4th of 2012, starting a new era of discoveries in particle physics domain. With the confirmation of the existence of the Higgs boson, searches for new physics involving this boson are of major interest. In particular, data can be used to look for new massive particles that decay into the Higgs boson accompanied with other particles of the standard model. One expected signature is a Higgs boson produced with a top quark, the two heaviest particles in the standard model. The standard model predicts a cross section of top-Higgs production, then any enhancement of their associated production will be a clear signature of physics beyond the standard model. In addition, the existence of physics beyond the standard model can also be reflected by resonances that decay into a top-quark and a Higgs boson. In the first part of my work I describe the theoretical and experimental foundations of the standard model, as well as the experimental device. In the same theoretical chapter, I also discuss the formulation of an extension of the standard model. In addition, I describe a feasibility study of a search of one of the particles predicted by such model. The second part contains the realization of the search for a top partner, T_, within the CMS experiment. This top partner is a new particle very similar to the standard model top quark, but much heavier, that can decay into a top quark and a Higgs boson. The analysis looks for this particle in the full hadronic final state, where the Higgs boson decays into two b-quarks and the top quark decays into three standard model quarks, a b and two light quarks. In this channel, I reconstruct its mass from the identification of all its decay products. As a result of the analysis, I show the limits on the T_ production cross section from the number of observed events in the specific signature.
Search For Vector Like Quarks With The Atlas Experiment At The Large Hadron Collider
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Author : Mesut Ünal
language : en
Publisher:
Release Date : 2022
Search For Vector Like Quarks With The Atlas Experiment At The Large Hadron Collider written by Mesut Ünal 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.
This thesis describes a search for new, heavy fermions using LHC data collected in 2015-2018 with the ATLAS detector. A search for single production of a vector-like top quark (VLT) decaying to a Z boson and a top quark in the dilepton final state is presented. This high statistics decay channel has high discovery potential thanks to the possibility of VLT mass reconstruction using the Z boson and top quark masses. The top quark decaying from a VLT is typically found in highly boosted, large-radius hadronic jets, which makes the identification challenging. To overcome this, novel top quark candidate identification techniques have been developed using the substructure information of variable-radius re-clustered jets. Variable-radius re-clustering uses large jets within a cone of momentum-dependent radius. The substructure information most sensitive to the top quark identification includes the mass, transverse momentum, and number of jet constituents. In this thesis, a detailed statistical analysis of the results of the search for VLT is presented. No deviation from the Standard Model is observed. The strongest to date observed and expected limits on the vector-like top mass as a function of coupling constant are set. In the case of VLT singlets with a coupling of kappa = 0.5, masses below 1810 GeV are excluded at the 95% confidence level
Search For Single Production Of Vector Like Quarks Decaying To A Top Quark And A W Boson In Proton Proton Collisions At S
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Author : Albert M. Sirunyan
language : en
Publisher:
Release Date : 2018
Search For Single Production Of Vector Like Quarks Decaying To A Top Quark And A W Boson In Proton Proton Collisions At S written by Albert M. Sirunyan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Search For Vectorlike B Quarks In Events With One Isolated Lepton Missing Transverse Momentum And Jets At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Vectorlike B Quarks In Events With One Isolated Lepton Missing Transverse Momentum And Jets At Arrow 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 has been performed for pair production of heavy vectorlike down-type (B) quarks. The analysis explores the lepton-plus-jets final state, characterized by events with one isolated charged lepton (electron or muon), significant missing transverse momentum, and multiple jets. One or more jets are required to be tagged as arising from b quarks, and at least one pair of jets must be tagged as arising from the hadronic decay of an electroweak boson. The analysis uses the full data sample of pp collisions recorded in 2012 by the ATLAS detector at the LHC, operating at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 20.3 fb-1. No significant excess of events is observed above the expected background. Limits are set on vectorlike B production, as a function of the B branching ratios, assuming the allowable decay modes are B → Wt/Zb/Hb. In the chiral limit with a branching ratio of 100% for the decay B → Wt, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 810 GeV (760 GeV). In the case where the vectorlike B quark has branching ratio values corresponding to those of an SU(2) singlet state, the observed (expected) 95% C.L. lower limit on the vectorlike B mass is 640 GeV (505 GeV). The same analysis, when used to investigate pair production of a colored, charge 5/3 exotic fermion T5/3, with subsequent decay T5/3 → Wt, sets an observed (expected) 95% C.L. lower limit on the T5/3 mass of 840 GeV (780 GeV).
Search For Single Vector Like Quarks In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2010
Search For Single Vector Like Quarks 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 2010 with categories.
We present a search for hypothetical vector-like quarks in p{bar p} collisions at (square root)s = 1.96 TeV. The data were collected by the D0 detector at the Fermilab Tevatron Collider and correspond to an integrated luminosity of 5.4 fb−1. We select events with a final state composed of a W or Z boson and a jet consistent with a heavy object decay. We observe no significant excess in comparison to the background prediction and set limits on production cross sections for vector-like quarks decaying to W+jet and Z+jet. Assuming a vector-like quark to standard model quark coupling parameter {tilde {kappa}}{sub qQ} of unity, we exclude vector-like quarks with mass below 693 GeV for decays to W+jet and mass below 449 GeV for decays to Z+jet. These are the most stringent mass limits for electroweak single vector-like quark production at hadron colliders.