Measurements Of Normalized Differential Cross Sections For Tt U00af Production In Pp Collisions At S

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Measurements Of Normalized Differential Cross Sections For Tt U00af Production In Pp Collisions At S

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Author :
language : en
Publisher:
Release Date : 2014

Measurements Of Normalized Differential Cross Sections For Tt U00af Production In 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 2014 with categories.

We present measurements of normalized differential cross sections for top-quark pair production as a function of the top-quark transverse momentum, and of the mass, transverse momentum, and rapidity of the t¯t system, in proton–proton collisions at a center-of-mass energy of √ s=7 TeV. The data set corresponds to an integrated luminosity of 4.6 fb−1, recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. Events are selected in the lepton + jets channel, requiring exactly one lepton and at least four jets with at least one of the jets tagged as originating from a b-quark. The measured spectra are corrected for detector efficiency and resolution effects and are compared to several Monte Carlo simulations and theory calculations. The results are in fair agreement with the predictions in a wide kinematic range. Nevertheless, data distributions are softer than predicted for higher values of the mass of the t¯t system and of the top-quark transverse momentum. Lastly, the measurements can also discriminate among different sets of parton distribution functions.

Measurement Of Normalized Differential Tt Cross Sections In The Dilepton Channel From Pp Collisions At S

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Author :
language : en
Publisher:
Release Date : 2017

Measurement Of Normalized Differential Tt Cross Sections In The Dilepton Channel 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.

Measurement Of The Ttbar Production Cross Section In The All Jets Final State In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2015

Measurement Of The Ttbar Production Cross Section In The All Jets Final State 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 2015 with categories.

The cross section for tt production in the all-jets final state is measured in pp collisions at a centre-of-mass energy of 8 TeV at the LHC with the CMS detector, in data corresponding to an integrated luminosity of 18.4 fb-1. The inclusive cross section is found to be 275.6 ±6.1 (stat) ± 37.8 (syst) ± 7.2 (lumi) pb. The normalized differential cross sections are measured as a function of the top quark transverse momenta, pT, and compared to predictions from quantum chromodynamics. The results are reported at detector, parton, and particle levels. In all cases, the measured top quark pT spectra are significantly softer than theoretical predictions.

Measurement Of The Differential Cross Sections For Top Quark Pair Production As A Function Of Kinematic Event Variables In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2016

Measurement Of The Differential Cross Sections For Top Quark Pair Production As A Function Of Kinematic Event Variables 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 2016 with categories.

Measurements are reported of the normalized differential cross sections for top quark pair production with respect to four kinematic event variables: the missing transverse energy; the scalar sum of the jet transverse momentum (pT); the scalar sum of the pT of all objects in the event; and the pT of leptonically decaying W bosons from top quark decays. The data sample, collected using the CMS detector at the LHC, consists of 5.0 inverse-femtobarns of proton-proton collisions at sqrt(s) = 7 TeV and 19.7 inverse-femtobarns at sqrt(s) = 8 TeV. Top quark pair events containing one electron or muon are selected. The results are presented after correcting for detector effects to allow direct comparison with theoretical predictions. No significant deviations from the predictions of several standard model event simulation generators are observed.

Measurement Of Double Differential Cross Sections For Top Quark Pair Production In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2017

Measurement Of Double Differential Cross Sections For Top Quark Pair Production 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 2017 with categories.

Normalized double-differential cross sections for top quark pair (ttbar) production are measured in pp collisions at a centre-of-mass energy of 8 TeV with the CMS experiment at the LHC. The analyzed data correspond to an integrated luminosity of 19.7 inverse femtobarns. The measurement is performed in the dilepton e+/- mu-/+ final state. The ttbar cross section is determined as a function of various pairs of observables characterizing the kinematics of the top quark and ttbar system. The data are compared to calculations using perturbative quantum chromodynamics at next-to-leading and approximate next-to-next-to-leading orders. They are also compared to predictions of Monte Carlo event generators that complement fixed-order computations with parton showers, hadronization, and multiple-parton interactions. Overall agreement is observed with the predictions, which is improved when the latest global sets of proton parton distribution functions are used. The inclusion of the measured ttbar cross sections in a fit of parametrized parton distribution functions is shown to have significant impact on the gluon distribution.

Measurements Of Differential Cross Sections For The Production Of Top Quark Pairs In Pp Collisions At S

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Author : Henriette Aarup Petersen
language : en
Publisher:
Release Date : 2022

Measurements Of Differential Cross Sections For The Production Of Top Quark Pairs In Pp Collisions At S written by Henriette Aarup Petersen 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.

Measurement Of The Differential Cross Sections For Top Quark Pair Production As A Function Of Kinematic Event Variables In Pp Collisions At S

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Author :
language : en
Publisher:
Release Date : 2016

Measurement Of The Differential Cross Sections For Top Quark Pair Production As A Function Of Kinematic Event Variables In 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 2016 with categories.

Measurements are reported of the normalized differential cross sections for top quark pair production with respect to four kinematic event variables: the missing transverse energy; the scalar sum of the jet transverse momentum (pT); the scalar sum of the pT of all objects in the event; and the pT of leptonically decaying W bosons from top quark decays. The data sample, collected using the CMS detector at the LHC, consists of 5.0 fb–1 of proton-proton collisions at √s = 7 TeV and 19.7 fb–1 at √s = 8 TeV. Top quark pair events containing one electron or muon are selected. The results are presented after correcting for detector effects to allow direct comparison with theoretical predictions. In conclusion, no significant deviations from the predictions of several standard model event simulation generators are observed.

Measurements Of Differential Production Cross Sections For A Z Boson In Association With Jets In Pp Collisions At S

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Author :
language : en
Publisher:
Release Date : 2016

Measurements Of Differential Production Cross Sections For A Z Boson In Association With Jets In 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 2016 with categories.

Measurement Of The W B Jet And W C Jet Differential Production Cross Sections In Pp U00af Collisions At U221a S

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Author :
language : en
Publisher:
Release Date : 2015

Measurement Of The W B Jet And W C Jet Differential Production Cross Sections In Pp U00af 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.

In this study, we present a measurement of the cross sections for the associated production of a W boson with at least one heavy quark jet, b or c, in proton–antiproton collisions. Data corresponding to an integrated luminosity of 8.7 fb–1 recorded with the D0 detector at the Fermilab Tevatron pp¯ Collider at √s = 1.96 TeV are used to measure the cross sections differentially as a function of the jet transverse momenta in the range 20 to 150 GeV. These results are compared to calculations of perturbative QCD theory as well as predictions from Monte Carlo generators.

Measurements Of W W Production Cross Sections In Pp Collisions At S

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Author : Jack Cameron MacDonald
language : en
Publisher:
Release Date : 2022

Measurements Of W W Production Cross Sections In Pp Collisions At S written by Jack Cameron MacDonald 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.