Inclusive And Differential Measurements Of The T T Bar Charge Asymmetry In Proton Proton Collisions At Sqrt S
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Inclusive And Differential Measurements Of The Mathrm T Bar T Charge Asymmetry In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Inclusive And Differential Measurements Of The Mathrm T Bar T Charge Asymmetry 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 tt charge asymmetry is measured in proton-proton collisions at a centre-of-mass energy of 8 TeV. The data, collected with the CMS experiment at the LHC, correspond to an integrated luminosity of 19.7 fb-1 . Selected events contain an electron or a muon and four or more jets, where at least one jet is identified as originating from b-quark hadronization. The inclusive charge asymmetry is found to be 0.0010 " 0.0068 (stat) " 0.0037 (syst). In addition, differential charge asymmetries as a function of rapidity, transverse momentum, and invariant mass of the tt system are studied. For the first time at the LHC, our measurements are also performed in a reduced fiducial phase space of top quark pair production, with an integrated result of -0.0035 " 0.0072 (stat) " 0.0031 (syst). Additionally, all measurements are consistent within two standard deviations with zero asymmetry as well as with the predictions of the standard model.
Inclusive And Differential Measurements Of The T T Bar Charge Asymmetry In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
Inclusive And Differential Measurements Of The T T Bar Charge Asymmetry 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 2012 with categories.
The t t-bar charge asymmetry is measured in events containing a charged lepton (electron or muon) and at least four jets, one of which is identified as originating from b-quark hadronization. The analyzed dataset corresponds to an integrated luminosity of 5.0 inverse femtobarns collected with the CMS detector at the LHC. An inclusive and three differential measurements of the t t-bar charge asymmetry as a function of rapidity, transverse momentum, and invariant mass of the t t-bar system are presented. The measured inclusive t t-bar charge asymmetry is A(C) = 0.004 +/- 0.010 (stat.) +/- 0.011 (syst.). This result and the three differential measurements are consistent with zero asymmetry as well as with the predictions of the standard model.
Measurements Of The T Bar T Charge Asymmetry Using The Dilepton Decay Channel In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Measurements Of The T Bar T Charge Asymmetry Using The Dilepton Decay Channel 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.
The t t-bar charge asymmetry in proton-proton collisions at $\sqrt{s} =$ 7 TeV is measured using the dilepton decay channel (ee, e mu, or mu mu). The data correspond to a total integrated luminosity of 5.0 inverse femtobarns, collected by the CMS experiment at the LHC. The t t-bar and lepton charge asymmetries, defined as the differences in absolute values of the rapidities between the reconstructed top quarks and antiquarks and of the pseudorapidities between the positive and negative leptons, respectively, are measured to be Ac = -0.010 +/- 0.017 (stat.) +/- 0.008 (syst.) and Aclep = 0.009 +/- 0.010 (stat.) +/- 0.006 (syst). The lepton charge asymmetry is also measured as a function of the invariant mass, rapidity, and transverse momentum of the t t-bar system. All measurements are consistent with the expectations of the standard model.
Measurements Of T Bar T Charge Asymmetry Using Dilepton Final States In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurements Of T Bar T Charge Asymmetry Using Dilepton Final States 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.
The charge asymmetry in $t \bar t$ events is measured using dilepton final states produced in pp collisions at the LHC at √s = 8 TeV. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.5 fb-1. The measurements are performed using events with two oppositely charged leptons (electrons or muons) and two or more jets, where at least one of the jets is identified as originating from a bottom quark. The charge asymmetry is measured from differences in kinematic distributions, unfolded to the parton level, of positively and negatively charged top quarks and leptons. The $t \bar t$ and leptonic charge asymmetries are found to be 0.011 ± 0.011 (stat) ± 0.007 (syst) and 0.003 ± 0.006 (stat) ± 0.003 (syst), respectively. Lastly, These results, as well as charge asymmetry measurements made as a function of $t \bar t$ system kinematic properties, are in agreement with predictions of the standard model.
Measurement Of The Differential Cross Section And Charge Asymmetry For Inclusive Mathrm P Mathrm P Rightarrow Mathrm W Pm X Production At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Differential Cross Section And Charge Asymmetry For Inclusive Mathrm P Mathrm P Rightarrow Mathrm W Pm X Production 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.
The differential cross section and charge asymmetry for inclusive pp → W± + X → [mu]±[nu] + X production at √s = 8 TeV are measured as a function of muon pseudorapidity. The data sample corresponds to an integrated luminosity of 18.8 inverse femtobarns recorded with the CMS detector at the LHC. Furthermore, these results provide important constraints on the parton distribution functions of the proton in the range of the Bjorken scaling variable x from 10E-3 to 10E-1.
Longitudinal Double Spin Asymmetry And Cross Section For Inclusivejet Production In Polarized Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2006
Longitudinal Double Spin Asymmetry And Cross Section For Inclusivejet Production In Polarized 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 2006 with categories.
We report a measurement of the longitudinal double-spinasymmetry A_LL and the differential cross section for inclusivemidrapidity jet production in polarized proton collisions at sqrt(s)=200GeV. The cross section data cover transverse momenta 5
Measurement Of The Differential Cross Sections Of Inclusive Prompt And Non Prompt J Psi Production In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of The Differential Cross Sections Of Inclusive Prompt And Non Prompt J Psi Production 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 2013 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.
Longitudinal Double Spin Asymmetry And Cross Section For Inclusive Neutral Pion Production In Polarized Proton Collisions At The Square Root Of Sigma
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Author : Alan Michael Hoffman
language : en
Publisher:
Release Date : 2009
Longitudinal Double Spin Asymmetry And Cross Section For Inclusive Neutral Pion Production In Polarized Proton Collisions At The Square Root Of Sigma written by Alan Michael Hoffman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Twenty years of polarized lepton-nucleon scattering experiments have found that the contribution from quark spins (1/2[delta] [sigma]) to the spin of the proton is only ~ 35%. This has lead researchers to look elsewhere, specifically to gluon spin ([delta sigma]) for a large contribution to proton spin. [delta sigma] has been only loosely constrained in polarized DIS and SIDIS experiments. Polarized proton-proton collisions at RHIC provide sensitivity to [delta sigma] through measurements of the longitudinal double-spin asymmetry, ALL. This work presents a measurement of ALL for inclusive 7ro production in polarized proton-proton collisions using the STAR detector and data from RHIC Run 6. 7r0s are abundantly produced at mid-rapidity in proton-proton collisions, making them natural candidates for studies of [delta] [sigma]. Novel techniques for reconstructing 7ros at STAR are discussed, and a measurement of the unpolarized cross section presented. Finally, the measured ALL is compared to perturbative QCD predictions and from this comparison constraints are placed on [delta] [sigma].
Measurement Of The W Boson Charge Asymmetry In Proton Proton Collisions At Sqrts
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Author : Tai-Hua Lin
language : en
Publisher:
Release Date : 2018
Measurement Of The W Boson Charge Asymmetry In Proton Proton Collisions At Sqrts written by Tai-Hua Lin 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.