Atlas B Jet Identification Performance And Efficiency Measurement With Tt Over Bar Events In Pp Collisions At Square Root S

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Atlas B Jet Identification Performance And Efficiency Measurement With Tt Over Bar Events In Pp Collisions At Square Root S

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Author : ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2019

Atlas B Jet Identification Performance And Efficiency Measurement With Tt Over Bar Events In Pp Collisions At Square Root S written by 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 2019 with categories.

Abstract: The algorithms used by the ATLAS Collaboration during Run 2 of the Large Hadron Collider to identify jets containing b-hadrons are presented. The performance of the algorithms is evaluated in the simulation and the efficiency with which these algorithms identify jets containing b-hadrons is measured in collision data. The measurement uses a likelihood-based method in a sample highly enriched in tt ̄ events. The topology of the t→Wb decays is exploited to simultaneously measure both the jet flavour composition of the sample and the efficiency in a transverse momentum range from 20 to 600 GeV. The efficiency measurement is subsequently compared with that predicted by the simulation. The data used in this measurement, corresponding to a total integrated luminosity of 80.5 fb−1, were collected in proton-proton collisions during the years 2015-2017 at a centre-of-mass energy s√= 13 TeV. By simultaneously extracting both the efficiency and jet flavour composition, this measurement significantly improves the precision compared to previous results, with uncertainties ranging from 1 to 8% depending on the jet transverse momentum

Measurement Of The C Jet Mistagging Efficiency In Tt Over Bar Events Using Pp Collision Data At Square Root S

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Author : [Study Group] ATLAS Collaboration CERN
language : en
Publisher:
Release Date : 2022

Measurement Of The C Jet Mistagging Efficiency In Tt Over Bar Events Using Pp Collision Data 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 technique is presented to measure the efficiency with which c-jets are mistagged as b-jets (mistagging efficiency) using tt ̄ events, where one of the W bosons decays into an electron or muon and a neutrino and the other decays into a quark-antiquark pair. The measurement utilises the relatively large and known W→cs branching ratio, which allows a measurement to be made in an inclusive c-jet sample. The data sample used was collected by the ATLAS detector at s√=13 TeV and corresponds to an integrated luminosity of 139 fb−1. Events are reconstructed using a kinematic likelihood technique which selects the mapping between jets and tt ̄ decay products that yields the highest likelihood value. The distribution of the b-tagging discriminant for jets from the hadronic W decays in data is compared with that in simulation to extract the mistagging efficiency as a function of jet transverse momentum. The total uncertainties are in the range 3-17%. The measurements generally agree with those in simulation but there are some differences in the region corresponding to the most stringent b-jet tagging requirement

Measurement Of The Jet Mass In Highly Boosted T Tbar Events From Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2017

Measurement Of The Jet Mass In Highly Boosted T Tbar 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 2017 with categories.

The first measurement of the jet mass m[jet] of top quark jets produced in t t-bar events from pp collisions at sqrt(s) = 8 TeV is reported for the jet with the largest transverse momentum pt in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7 inverse femtobarns. The measurement is performed in the lepton+jets channel in which the products of the semileptonic decay t to bW with W to l nu where l is an electron or muon, are used to select t t-bar events with large Lorentz boosts. The products of the fully hadronic decay t to bW with W to q q'-bar are reconstructed using a single Cambridge-Aachen jet with distance parameter R=1.2, and pt>400 GeV. The t t-bar cross section as a function of m[jet] is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the m[jet] distribution is sensitive to the top quark mass m[t], and the data are used to extract a value of m[t] to assess this sensitivity.

Measurement Of Jets Produced In Top Quark Events Using The Emu Final State With 2 B Tagged Jets In Pp Collisions At 8 Tev With The Atlas Detector

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Author : Jacquelyn Kay Brosamer
language : en
Publisher:
Release Date : 2016

Measurement Of Jets Produced In Top Quark Events Using The Emu Final State With 2 B Tagged Jets In Pp Collisions At 8 Tev With The Atlas Detector written by Jacquelyn Kay Brosamer 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.

The transverse momentum and multiplicity of jets produced in top quark events are measured using 20.3 inverse fb of pp collision data at a center-of-mass energy of 8 tev. Jets are selected from top events requiring an opposite-charge $e\mu$ pair and two b-tagged jets in the final state. The data are corrected to obtain the particle-level fiducial cross section for additional jets with rank 1-4, where rank=1 is the leading additional jet. These distributions are used to obtain the extra jet multiplicity as a function of minimum jet pt threshold. The results are compared with several next to leading order Monte Carlo generators. The resulting measurements can be used to tune Monte Carlo QCD modelling and may also reduce associated modelling uncertainties for LHC top quark physics measurements.

Fragmentation Properties Of Jets Produced In Pp Collisions At Square Root Sign S

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Author : Bradley Hubbard
language : en
Publisher:
Release Date : 1989

Fragmentation Properties Of Jets Produced In Pp Collisions At Square Root Sign S written by Bradley Hubbard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

Measuring Jet Substructure In Topologies Containing W Top And Light Jets With The Atlas Detector

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Author : Amal Vaidya
language : en
Publisher:
Release Date : 2020

Measuring Jet Substructure In Topologies Containing W Top And Light Jets With The Atlas Detector written by Amal Vaidya 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.

Measurement Of The Jet Mass In Highly Boosted Tt Events From Pp Collisions At S

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Author :
language : en
Publisher:
Release Date : 2017

Measurement Of The Jet Mass In Highly Boosted Tt Events From Pp Collisions At 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.

Properties Of Jets In High Et Events Produced In Pp Collisions At Square Root S

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Author :
language : en
Publisher:
Release Date : 1983

Properties Of Jets In High Et Events Produced In Pp Collisions At Square Root 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 1983 with categories.

Performance Of Jet Missing Transverse Energy And Tau Reconstruction With Atlas In P P Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2013

Performance Of Jet Missing Transverse Energy And Tau Reconstruction With Atlas In P 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 2013 with categories.

Measurement Of The Inclusive And Dijet Cross Sections Of B Jets In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2013

Measurement Of The Inclusive And Dijet Cross Sections Of B Jets 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 2013 with categories.