scholarly journals A MODEL CONSTRUCTION OF SELF-SIMILARITY BASED DOUBLE PARTON DISTRIBUTION FUNCTIONS FOR PROTON–PROTON COLLISION AT LHC

2013 ◽  
Vol 28 (17) ◽  
pp. 1350079 ◽  
Author(s):  
D. K. CHOUDHURY ◽  
AKBARI JAHAN
Keyword(s):  
Parton Distribution ◽  
Distribution Functions ◽  
Model Construction ◽  
Proton Collision ◽  
Self Similarity ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Construction Of Self ◽  
Small X ◽  
Proton Proton Collision

We construct a model for double parton distribution functions (dPDFs) based on the notion of self-similarity, pursued earlier for small x physics at HERA. The most general form of dPDFs contains total 13 parameters to be fitted from data of proton–proton collision at LHC. It is shown that the constructed dPDF does not factorize into two single PDFs in conformity with QCD expectation, and it satisfies the condition that at the kinematic boundary x1+x2 = 1 (where x1 and x2 are the longitudinal fractional momenta of two partons), the dPDF vanishes.

scholarly journals Double Heavy Quark-Antiquark Pair Production in Double Parton Scattering Processes at the LHC

2017 ◽  
Vol 45 ◽  
pp. 1760065
Author(s):  
Cristiano B. Mariotto ◽  
Rafael P. da Silva
Keyword(s):  
Heavy Quark ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Proton Collision ◽  
Parton Distribution Functions ◽  
Initial State ◽  
Proton Proton ◽  
Double Parton Scattering ◽  
Proton Proton Collision ◽  
Parton Scattering

The high gluon density in the initial state of hadronic collisions at LHC energies implies that the probability of multiple parton interactions within one proton-proton collision increases. In particular, this motivates one to investigate the importance of Double Parton Scattering (DPS) processes at the LHC. In a DPS process one can have, from one proton-proton collision, two interacting partons coming from each colliding hadron. In this context, the relation between the double parton distribution functions (dPDF) and the usual parton distribution functions (PDF) is discussed, and some formulae for the DPS cross section are compared. Our results focus on the production of different final states related to two heavy quark-antiquark pairs. Those include [Formula: see text], which is called the golden channel of DPS, [Formula: see text] and [Formula: see text].

PARTON DISTRIBUTION FUNCTIONS AND THE QCD-IMPROVED PARTON MODEL — AN OVERVIEW

1987 ◽  
Vol 02 (04) ◽  
pp. 1369-1387 ◽  
Author(s):  
Wu-Ki Tung
Keyword(s):  
Parton Distribution ◽  
Particle Production ◽  
Heavy Particle ◽  
Parton Model ◽  
Distribution Functions ◽  
Collider Physics ◽  
Parton Distribution Functions ◽  
Parton Distributions ◽  
First Order ◽  
Small X

Some non-trivial features of the QCD-improved parton model relevant to applications on heavy particle production and semi-hard (small-x) processes of interest to collider physics are reviewed. The underlying ideas are illustrated by a simple example. Limitations of the naive parton formula as well as first order corrections and subtractions to it are dis-cussed in a quantitative way. The behavior of parton distribution functions at small x and for heavy quarks are discussed. Recent work on possible impact of unconventional small-x behavior of the parton distributions on small-x physics at SSC and Tevatron are summarized. The Drell-Yan process is found to be particularly sensitive to the small x dependence of parton distributions. Measurements of this process at the Tevatron can provide powerful constraints on the expected rates of semi-hard processes at the SSC.

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 Achievements and Open Issues in the Determination of Polarized Parton Distribution Functions

2016 ◽  
Vol 40 ◽  
pp. 1660016 ◽  
Author(s):  
Emanuele R. Nocera
Keyword(s):  
Parton Distribution ◽  
Polarized Light ◽  
Heavy Ion ◽  
Distribution Functions ◽  
Current Status ◽  
Relativistic Heavy Ion Collider ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Open Issues

I review the current status of the determination of helicity-dependent, or polarized, parton distribution functions from a comprehensive analysis of experimental data in perturbative quantum chromodynamics. I illustrate the latest achievements driven by new measurements in polarized proton-proton collisions at the Relativistic Heavy Ion Collider, namely the first evidence of a sizable polarized light sea quark asymmetry and of a positive polarized gluon distribution in the proton. I discuss which are the open issues in the determination of polarized distributions, and how these may be addressed in the future by ongoing, planned and proposed experimental programs.

scholarly journals Production of massless charm jets in pp collisions at next-to-leading order of QCD

2015 ◽  
Vol 30 (18n19) ◽  
pp. 1550111 ◽  
Author(s):  
Isabella Bierenbaum ◽  
Gustav Kramer
Keyword(s):  
Transverse Momentum ◽  
Parton Distribution ◽  
Distribution Functions ◽  
Inclusive Production ◽  
Leading Order ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Intrinsic Charm ◽  
Proton Proton Collisions

We present predictions for the inclusive production of charm jets in proton–proton collisions at 7 TeV. Several CTEQ parton distribution functions (PDFs) of the CTEQ6.6M type are employed, where two of the CTEQ6.6 PDFs have intrinsic charm. At large enough jet transverse momentum and large jet rapidity, the intrinsic charm content can be tested.

scholarly journals Study of the Polarized Gluon Structure of a Proton via Prompt-Photon Production in the SPD Experiment at the NICA Collider

2019 ◽  
Vol 64 (7) ◽  
pp. 631 ◽  
Author(s):  
A. Rymbekova
Keyword(s):  
Parton Distribution ◽  
Distribution Functions ◽  
Prompt Photon ◽  
Hard Scattering ◽  
Parton Distribution Functions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Polarized Proton ◽  
Proton Proton Collisions ◽  
Nica Collider

Photons produced in the hard scattering of partons, named prompt photons, provide information about the internal structure of hadrons. The NICA collider has the possibility to provide new data to study the production of prompt photons in non-polarized and polarized proton-proton collisions, which gives an access to spin-dependent parton distribution functions for gluons. Unpolarized and polarized physics with prompt photons and capabilities of the SPD detector in such measurements is discussed.

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