Search For A Vectorlike Quark With Charge 2 3 In T Z Events From Pp Collisions At Sqrt S

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Search For A Vectorlike Quark With Charge 2 3 In T Z Events From Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2011

Search For A Vectorlike Quark With Charge 2 3 In T Z Events From 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-produced heavy vector-like charge-2/3 quarks, T, in pp collisions at a center-of-mass energy of 7 TeV, is performed with the CMS detector at the LHC. Events consistent with the flavor-changing-neutral-current decay of a T quark to a top quark and a Z boson are selected by requiring two leptons from the Z-boson decay, as well as an additional isolated charged lepton. In a data sample corresponding to an integrated luminosity of 1.14 inverse femtobarns, the number of observed events is found to be consistent with the standard model background prediction. Assuming a branching fraction of 100% for the decay T to tZ, a T quark with a mass less than 475 GeV/c2̂ is excluded at the 95% confidence level.

Inclusive Search For A Vector Like T Quark With Charge Frac 2 3 In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2014

Inclusive Search For A Vector Like T Quark With Charge Frac 2 3 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 2014 with categories.

A search is performed for a massive new vector-like quark T, with charge 2/3, that is pair produced together with its antiparticle in proton-proton collisions. The data were collected by the CMS experiment at the Large Hadron Collider in 2012 at sqrt(s) = 8 TeV and correspond to an integrated luminosity of 19.5 inverse femtobarns. The T quark is assumed to decay into three different final states, bW, tZ, and tH. The search is carried out using events with at least one isolated lepton. No deviations from standard model expectations are observed, and lower limits are set on the T quark mass at 95% confidence level. The lower limit lies between 687 and 782 GeV for all possible values of the branching fractions into the three different final states assuming strong production. These limits are the most stringent constraints to date on the existence of such a quark.

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.

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 The Pair Production Of A Vector Like Quark In B Z Events From Pp Collisions At Radix S

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Author : 高凱逸
language : en
Publisher:
Release Date : 2013

Search For The Pair Production Of A Vector Like Quark In B Z Events From Pp Collisions At Radix S written by 高凱逸 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 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 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.

Search For Single Production Of Vector Like Quarks Decaying Into Wb In Pp Collisions At Sqrt S

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Author : Dustin Biedermann
language : en
Publisher:
Release Date : 2020

Search For Single Production Of Vector Like Quarks Decaying Into Wb In Pp Collisions At Sqrt S written by Dustin Biedermann and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.

Search For A Heavy Bottom Like Quark In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2011

Search For A Heavy Bottom Like Quark 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-produced bottom-like quarks in pp collisions at sqrt(s) = 7 TeV is conducted with the CMS experiment at the LHC. The decay b' to tW is considered in this search. The b' b'-bar to tW-̂ t-bar W+̂ process can be identified by the distinctive signature of trileptons and same-sign dileptons. With a data sample corresponding to an integrated luminosity of 34 inverse picobarns, no excess above the standard model background predictions is observed and a b' quark with a mass between 255 and 361 GeV/c2̂ is excluded at the 95% confidence level.

Exotic Signals Of Vectorlike Quarks

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Author :
language : en
Publisher:
Release Date : 2016

Exotic Signals Of Vectorlike Quarks 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.

Vectorlike fermions are an important target for hadron collider searches. We show that the vectorlike quarks may predominantly decay via higher-dimensional operators into a quark plus a couple of other Standard Model fermions. Pair production of vectorlike quarks of charge 2/3 at the LHC would then lead to a variety of possible final states, including $t\bar t + 4\tau$, $t\bar b\nu + 3\tau$, $t\bar t\tau\tau\nu\nu$ or $t\bar t + 4b$. Additional channels ($b\bar b + 4\tau$, $6b$, etc.) arise in the case of a vectorlike quark of charge $-1/3$. If the vectorlike quark decays into three light quarks, then the $(3j)(3j)$ signal is more difficult to observe, and the vectorlike quark mass is almost unconstrained by current searches.