scholarly journals Parton distribution functions and top quark differential cross section at the D0 $\sqrt{s}$=1.96 TeV and LHC $\sqrt{s}$=7, 13 TeV.

2016 ◽  
Author(s):  
Ali Khorramian
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Top Quark ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Parton Distribution Functions

scholarly journals Impact of the top quark cross-section data on parton distribution functions

2018 ◽  
Vol 33 (24) ◽  
pp. 1850142 ◽  
Author(s):  
M. Azizi ◽  
A. Khorramian ◽  
H. Abdolmaleki ◽  
S. Paktinat Mehdiabadi
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Parton Distribution ◽  
Valence Quark ◽  
Quark Distribution ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Top Quark Production ◽  
Quark Production ◽  
The Impact

Recent measurements of top quark pair production cross-section, which is performed at the LHC and the Tevatron collider, are studied using Hessian profiling technique to obtain their impact on the parton distribution functions (PDFs). The top quark production data covers different center-of-mass energies [Formula: see text], 5.02, 7, 8 and 13 TeV in either [Formula: see text] or [Formula: see text] collisions. It is explained how the Hessian profiling method may be used to assess the impact of these new data on PDFs and consequently on their predictions. In this research, the impact of recent measurements of top quark pair cross-sections on different CT14, MMHT2014 and NNPDF3.0 PDF sets is investigated. The analysis results show that the recent top quark production at the LHC and Tevatron data provide significant constraints in particular on the central value, relative uncertainties or both for the [Formula: see text]-quark distribution and the gluon PDFs in both CT14 and MMHT2014 PDF sets and are insensitive to valence-quark PDFs. A small constraint on the [Formula: see text]-sea quark distribution for CT14 PDF is also observed. There is no impact on the NNPDF3.0 PDF set in presence of these data.

H1 INCLUSIVE CROSS-SECTION MEASUREMENTS AND AN EXTRACTION OF PARTON DISTRIBUTION FUNCTIONS

2005 ◽  
Vol 20 (21) ◽  
pp. 1557-1571
Author(s):  
BURKARD REISERT
Keyword(s):  
Cross Section ◽  
Parton Distribution ◽  
Inclusive Cross Section ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Single Experiment ◽  
Parton Distributions ◽  
The Standard Model ◽  
Qcd Analysis

An extraction of the parton distributions of the proton by a next-to-leading order QCD fit in the framework of the Standard Model is presented. The fit implements a novel decomposition of the quark species into up- and down-type quark distributions, which is the key to enable a determination of flavor separated parton distributions from a single experiment. The fit is performed on the inclusive unpolarized neutral and charged current cross-section measurements by the H1 collaboration at HERA. The discussion of uncertainties of parton distribution functions is based upon but extends the QCD analysis published together with the H1 data.

scholarly journals Electroweak measurements from W, Z and photon final states

2014 ◽  
Vol 31 ◽  
pp. 1460276
Author(s):  
Hang Yin ◽  
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Z Boson ◽  
W Boson ◽  
Charge Asymmetry ◽  
Distribution Functions ◽  
Boson Mass ◽  
Electroweak Theory ◽  
Final States ◽  
Parton Distribution Functions

We present the most recent precision electroweak measurements of single W and Z boson cross section and properties from the LHC and Tevatron colliders, analyzing data collected by ATLAS, CDF, CMS, D0, and LHCb detectors. The results include the measurement of the single W and Z boson cross section at LHC, the differential cross section measurements, the measurement of W boson mass, the measurement of W and Z charge asymmetry. These measurements provide precision tests on the electroweak theory, high order predictions and the information can be used to constraint parton distribution functions.

scholarly journals Are PDFs still consistent with Tevatron data?

2018 ◽  
Vol 172 ◽  
pp. 03008 ◽  
Author(s):  
Zack Sullivan
Keyword(s):  
Excellent Agreement ◽  
Top Quark ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Parton Distribution Functions ◽  
Single Top ◽  
Theoretical Predictions ◽  
Top Quark Production ◽  
Quark Production ◽  
Active Data

As active data taking has moved to the LHC at CERN, more and more LHC data have been included into fits of parton distribution functions. An anomaly has arisen where formerly excellent agreement between theoretical predictions and experiment in single-top-quark production at the Tevatron is no longer quite as good. Is this indicative of a deeper issue?

scholarly journals Top Quark Pair-Production in Noncommutative Standard Model

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
M. Fisli ◽  
N. Mebarki
Keyword(s):  
Lower Bound ◽  
Standard Model ◽  
Differential Cross Section ◽  
Pair Production ◽  
Cross Section ◽  
Differential Cross ◽  
Top Quark ◽  
Tree Level ◽  
Hadron Collision ◽  
Geometry Parameter

The differential cross-section of the top quark pair production via the quark-antiquark annihilation subprocess in hadron collision is calculated within the noncommutative standard model. A pure NC analytical expression for the forward-backward asymmetry at the tree level is obtained. Moreover, using recent Tevatron results from the full RUN2 data, a new lower bound on the noncommutative geometry parameter is deduced.

scholarly journals Lepton-quark fusion at Hadron colliders, precisely

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Admir Greljo ◽  
Nudžeim Selimović
Keyword(s):  
Cross Section ◽  
Parton Distribution ◽  
Opposite Sign ◽  
Production Cross ◽  
Hadron Collider ◽  
Distribution Functions ◽  
Hadron Colliders ◽  
Parton Distribution Functions ◽  
Scalar Leptoquark ◽  
Wide Range

Abstract When a TeV-scale leptoquark has a sizeable Yukawa coupling, its dominant production mechanism at hadron colliders is the partonic-level lepton-quark fusion. Even though the parton distribution functions for leptons inside the proton are minuscule, they get compensated by the resonant enhancement. We present the first computation of higher order radiative corrections to the resonant leptoquark production cross section at the Large Hadron Collider (LHC). Next-to-leading (NLO) QCD and QED corrections are similar in size but come with the opposite sign. We compute NLO K-factors for a wide range of scalar leptoquark masses, as well as, all possible combinations of quark and lepton flavors and leptoquark charges. Theoretical uncertainties due to the renormalisation and factorisation scale variations and the limited knowledge of parton distribution functions are quantified. We finally discuss how to disentangle the flavor structure of leptoquark interactions by exploiting the interplay between different production channels.

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