scholarly journals How Bright is the Proton? A Precise Determination of the Photon Parton Distribution Function

2016 ◽  
Vol 117 (24) ◽  
Author(s):  
Aneesh Manohar ◽  
Paolo Nason ◽  
Gavin P. Salam ◽  
Giulia Zanderighi
Keyword(s):  
Distribution Function ◽  
Parton Distribution ◽  
Parton Distribution Function ◽  
Precise Determination

scholarly journals Probing the strange content of the proton with charm production in charged current at LHeC

2019 ◽  
Vol 79 (10) ◽  
Author(s):  
Hamed Abdolmaleki ◽  
◽  
Valerio Bertone ◽  
Daniel Britzger ◽  
Stefano Camarda ◽  
...  
Keyword(s):  
Distribution Function ◽  
Strange Quark ◽  
Parton Distribution Function ◽  
Charm Production ◽  
Charged Current ◽  
Kinematic Range ◽  
Multi Scale ◽  
Potential Improvement ◽  
The Impact

Abstract We study charm production in charged-current deep-inelastic scattering (DIS) using the xFitter framework. Recent results from the LHC have focused renewed attention on the determination of the strange-quark parton distribution function (PDF), and the DIS charm process provides important complementary constraints on this quantity. We examine the current PDF uncertainty and use LHeC pseudodata to estimate the potential improvement from this proposed facility. As xFitter implements both fixed-flavor- and variable-flavor-number schemes, we can compare the impact of these different theoretical choices; this highlights some interesting aspects of multi-scale calculations. We find that the high-statistics LHeC data covering a wide kinematic range could substantially reduce the strange PDF uncertainty.

scholarly journals Updating and optimizing error parton distribution function sets in the Hessian approach. II.

2019 ◽  
Vol 100 (11) ◽  
Author(s):  
Tie-Jiun Hou ◽  
Zhite Yu ◽  
Sayipjamal Dulat ◽  
Carl Schmidt ◽  
C.-P. Yuan
Keyword(s):  
Distribution Function ◽  
Parton Distribution ◽  
Parton Distribution Function

scholarly journals Measurement of the W boson mass

2022 ◽  
Vol 2022 (1) ◽  
Author(s):  
◽  
R. Aaij ◽  
A. S. W. Abdelmotteleb ◽  
C. Abellán Beteta ◽  
T. Ackernley ◽  
...  
Keyword(s):  
Distribution Function ◽  
Parton Distribution ◽  
W Boson ◽  
Parton Distribution Function ◽  
Boson Mass ◽  
Proton Collision ◽  
Proton Proton ◽  
Lhcb Experiment ◽  
Proton Proton Collision ◽  
Pm 10

Abstract The W boson mass is measured using proton-proton collision data at $$ \sqrt{s} $$ s = 13 TeV corresponding to an integrated luminosity of 1.7 fb−1 recorded during 2016 by the LHCb experiment. With a simultaneous fit of the muon q/pT distribution of a sample of W → μν decays and the ϕ* distribution of a sample of Z → μμ decays the W boson mass is determined to be$$ {m}_w=80354\pm {23}_{\mathrm{stat}}\pm {10}_{\mathrm{exp}}\pm {17}_{\mathrm{theory}}\pm {9}_{\mathrm{PDF}}\mathrm{MeV}, $$ m w = 80354 ± 23 stat ± 10 exp ± 17 theory ± 9 PDF MeV , where uncertainties correspond to contributions from statistical, experimental systematic, theoretical and parton distribution function sources. This is an average of results based on three recent global parton distribution function sets. The measurement agrees well with the prediction of the global electroweak fit and with previous measurements.

scholarly journals Transverse momentum-dependent parton distributions of pion in the light-front holographic model

2021 ◽  
Vol 36 (08n09) ◽  
pp. 2150052
Author(s):  
Navdeep Kaur ◽  
Harleen Dahiya
Keyword(s):  
Experimental Data ◽  
Distribution Function ◽  
Transverse Momentum ◽  
Parton Distribution ◽  
Parton Distribution Function ◽  
Light Front ◽  
Holographic Model ◽  
Parton Distributions ◽  
Transverse Momentum Dependent ◽  
Mulders Function

Using the light-front holographic model, we study the transverse momentum-dependent parton distributions (TMDs) for the case of pion. At leading twist, the unpolarized parton distribution function [Formula: see text] and the Boer–Mulders function [Formula: see text] are obtained for pion. We calculate both the functions using the light-front holographic model with spin improved wave function and compare the predicted results with available results of other models. In order to provide inputs in predicting future experimental data, an LO evolution is performed from model scale to experimental scale for the case of unpolarized parton distribution function [Formula: see text].

scholarly journals New method for reducing parton distribution function uncertainties in the high-mass Drell-Yan spectrum

2019 ◽  
Vol 99 (5) ◽  
Author(s):  
C. G. Willis ◽  
R. Brock ◽  
D. Hayden ◽  
T.-J. Hou ◽  
J. Isaacson ◽  
...  
Keyword(s):  
Distribution Function ◽  
Parton Distribution ◽  
Parton Distribution Function ◽  
New Method ◽  
High Mass
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