Constraints On Parton Distribution Functions And Extraction Of The Strong Coupling Constant From The Inclusive Jet Cross Section In Pp Collisions At Sqrt S
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Constraints On Parton Distribution Functions And Extraction Of The Strong Coupling Constant From The Inclusive Jet Cross Section In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Constraints On Parton Distribution Functions And Extraction Of The Strong Coupling Constant From The Inclusive Jet Cross Section 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 inclusive jet cross section for proton-proton collisions at a centre-of-mass energy of 7$~\mathrm{TeV}$ was measured by the CMS Collaboration at the LHC with data corresponding to an integrated luminosity of 5.0$~\mathrm{fb}^{-1}$. The measurement covers a phase space up to 2$~\mathrm{TeV}$ in jet transverse momentum and 2.5 in absolute jet rapidity. The statistical precision of these data leads to stringent constraints on the parton distribution functions of the proton. The data provide important input for the gluon density at high fractions of the proton momentum and for the strong coupling constant at large energy scales. Using predictions from perturbative quantum chromodynamics at next-to-leading order, complemented with electroweak corrections, the constraining power of these data is investigated and the strong coupling constant at the Z boson mass $M_{\mathrm{Z}}$ is determined to be $\alpha_S(M_{\mathrm{Z}}) = 0.1185 \pm 0.0019\, (\mathrm{exp})\, ^{+0.0060}_{-0.0037}\, (\mathrm{theo})$, which is in agreement with the world average.
Inclusive B Jet Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
Inclusive B Jet 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 2012 with categories.
The inclusive b-jet production cross section in pp collisions at a center-of-mass energy of 7 TeV is measured using data collected by the CMS experiment at the LHC. The cross section is presented as a function of the jet transverse momentum in the range 18
Measurement Of The Strong Coupling Constant Alpha Subscript S From Jet Production In W Right Arrow E Nu Events
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Author : Michael Allen Lindgren
language : en
Publisher:
Release Date : 1990
Measurement Of The Strong Coupling Constant Alpha Subscript S From Jet Production In W Right Arrow E Nu Events written by Michael Allen Lindgren and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Coupling constants categories.
Precision Measurement Of The Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2015
Precision Measurement Of The Longitudinal Double Spin Asymmetry For Inclusive Jet Production In Polarized Proton 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.
We report a new measurement of the midrapidity inclusive jet longitudinal double-spin asymmetry, ALL, in polarized pp collisions at center-of-mass energy √s = 200 GeV. The STAR data place stringent constraints on polarized parton distribution functions extracted at next-to-leading order from global analyses of inclusive deep-inelastic scattering (DIS), semi-inclusive DIS, and RHIC pp data. Lastly, the measured asymmetries provide evidence at the 3? level for positive gluon polarization in the Bjorken-x region x > 0.05 .
Extraction Of Jet Properties From Two Particle Azimuthal Correlations In Pp And Auau Collisions At Square Root Of S Subscript Nn
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Author : Paul Constantin
language : en
Publisher:
Release Date : 2004
Extraction Of Jet Properties From Two Particle Azimuthal Correlations In Pp And Auau Collisions At Square Root Of S Subscript Nn written by Paul Constantin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Two particle azimuthal correlation functions measured in pp and AuAu collisions at [square root of s subscript NN] = 200 GeV at midrapidity with the central arms of the PHENIX detector are analyzed in order to extract the properties of hadronic jets produced in QCD vacuum and highly excited QCD media, like the jet shape parameters j[Subscript T] and k[Subscript T], the jet conditional yields (number of associated hadrons per high p[Subscript T] trigger hadron), and the jet fragmentation function. The analysis of pp data starts with the measurement of the vacuum fragmentation function from which the p[Subscript T] dependence of the mean fragmentation momentum fraction z is extracted. We obtain a constant value of z = 0.74±0.02 for p[Subscript T] above 3 GeV/c. Soft (non-perturbative) parton fragmentation becomes significant below 3 GeV/c and the slope of the fragmentation function is p[Subscript T] dependent in this region. Gaussian fits to jet induced azimuthal correlations are employed to measure the mean jet fragmentation transverse momentum j[Subscript Ty] = 359 ± 11 (stat) ± 6 (syst) MeV/c and the mean partonic transverse momentum k[Subscript Ty] = 964 ± 49 (stat) ± 16 (syst) MeV/c. The analysis of AuAu data is based on azimuthal correlation functions between charged hadrons in the 1.5-3 GeV/c and 3-5 GeV/c p[Subscript T] regions in five classes of collision centrality. The mean jet fragmentation transverse momentum j[Subscript Ty] is centrality independent and consistent with the value in pp data mentioned above. A strong broadening with the centrality of the extracted mean partonic transverse momentum k[Subscript Ty] (multiplied by z[Subscript trigg]) is observed. This is an important finding because hadronic jet quenching through energy loss is expected to be accompanied by a broadening effect. Another important finding is that the jet conditional yields in both the near (delta phi [Difference] 0) and away (delta phi [Difference] pi) regions exhibit a slightly raising trend with centrality. This was also expected to accompany the jet quenching found at higher p[Subscript T] based on simple energy conservation considerations.
Measurement Of The Inclusive Jet Cross Section In Pp Collisions At S
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Author : CMS Collaboration
language : en
Publisher:
Release Date : 2015
Measurement Of The Inclusive Jet Cross Section In Pp Collisions At S written by CMS Collaboration 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.
J Psi And Psi 2s Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
J Psi And Psi 2s 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 2012 with categories.
A measurement of the J/psi and psi(2S) production cross sections in pp collisions at sqrt(s)=7 TeV with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 inverse picobarns. Using a fit to the invariant mass and decay length distributions, production cross sections have been measured separately for prompt and non-prompt charmonium states, as a function of the meson transverse momentum in several rapidity ranges. In addition, cross sections restricted to the acceptance of the CMS detector are given, which are not affected by the polarization of the charmonium states. The ratio of the differential production cross sections of the two states, where systematic uncertainties largely cancel, is also determined. The branching fraction of the inclusive B to psi(2S) X decay is extracted from the ratio of the non-prompt cross sections to be: BR(B to psi(2S) X) = (3.08 +/- 0.12(stat.+syst.) +/- 0.13(theor.) +/- 0.42(BR[PDG])) 10-̂3.
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.
The Inclusive Jet Cross Section In Proton Anti Proton Collisions At S 1 2
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Author :
language : en
Publisher:
Release Date : 2006
The Inclusive Jet Cross Section In Proton Anti Proton Collisions At S 1 2 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.
Abstract Not Provided.
Inclusive Jets At The Tevatron
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Author :
language : en
Publisher:
Release Date : 2001
Inclusive Jets At The Tevatron written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Results are presented for the inclusive jet cross section versus jet E[sub T] in p-[bar p] collisions at[radical]s= 1.8 TeV as measured by the CDF and D0 detectors at Fermilab's Tevatron collider. The data are compared to next-to-leading-order QCD predictions using different input parton distribution functions. The ratio of inclusive jet cross sections at[radical]s= 0.63 TeV and[radical]s= 1.8 TeV, versus jet[chi][sub T], is also presented and compared to QCD predictions.