Results 61 to 70 of about 73,038 (193)

Transverse momentum in double parton scattering: factorisation, evolution and matching

Journal of High Energy Physics, 2018
We give a description of double parton scattering with measured transverse momenta in the final state, extending the formalism for factorisation and resummation developed by Collins, Soper and Sterman for the production of colourless particles.
Maarten G. A. Buffing, Markus Diehl, Tomas Kasemets   +2 more
doaj   +1 more source

Multiple Parton Scattering in Nuclei: Parton Energy Loss [PDF]

, 2001
Multiple parton scattering and induced parton energy loss is studied in deeply inelastic scattering (DIS) off nuclei. The effect of multiple scattering of a highly off-shell quark and the induced parton energy loss is expressed in terms of the ...
Airapetian, Altarelli, Baier, Baier, Bialas, Collins, Collins, Dokshitzer, Field, Gribov, Gunion, Guo, Guo, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Gyulassy, Ji, Kastella, Kopeliovich, Landau, Luo, Luo, Luo, Migdal, Mueller, Nikolaev, Nilsson, Qiu, Qiu, Wang, Wang, Wiedemann, Xiaofeng Guo, Xin-Nian Wang, Zhakharov, Zhakharov   +38 more
core   +4 more sources

Can $\overline{MS}$ parton distributions be negative?

SciPost Physics Proceedings, 2022
We review our recent paper, where we proved Parton distributions functions (PDFs) to be positive at NLO in the $\overline{MS}$ factorization scheme. We present some additional material that was useful in completing the steps for the actual proof, but ...
Alessandro Candido, Stefano Forte, Felix Hekhorn
doaj   +1 more source

A critical study of the Monte Carlo replica method

Journal of High Energy Physics
We present a detailed mathematical study of the Monte Carlo replica method as applied in the global fitting literature from the high-energy physics theory community.
Mark N. Costantini, Maeve Madigan, Luca Mantani, James M. Moore   +3 more
doaj   +1 more source

ChiliPDF: Chebyshev interpolation for parton distributions

European Physical Journal C: Particles and Fields, 2022
Parton distribution functions (PDFs) are an essential ingredient for theoretical predictions at colliders. Since their exact form is unknown, their handling and delivery for practical applications relies on approximate numerical methods.
Markus Diehl, Riccardo Nagar, Frank J. Tackmann   +2 more
doaj   +1 more source

Nucleon parton distributions in a light-front quark model

, 2017
Continuing with our analysis of parton distributions in the nucleon, we extend our light-front quark model in order to obtain both the helicity independent and helicity dependent parton distributions, analytically matching the results of global fits at ...
Gutsche, Thomas, Lyubovitskij, Valery E., Schmidt, Ivan   +2 more
core   +1 more source

Structure functions and parton distributions [PDF]

, 2002
In this talk, I review the status of theoretical understanding of nuclear structure functions and parton distributions and discuss the constraints on nuclear parton distributions from existing data and the global QCD analysis.Comment: Latex, 10 pages, to
Altarelli, Ashman, Collins, Collins, Curci, Dokshitzer, Eskola, Eskola, Eskola, Eskola, Gribov, Gribov, Guo, Hirai, Jianwei Qiu, Martin, Martin, Mueller, Mueller, Pumplin, Qiu, Qiu, Qiu   +22 more
core   +3 more sources

Drell-Yan lepton pair production at low invariant masses: transverse-momentum resummation and non-perturbative effects in QCD

Journal of High Energy Physics
We consider the transverse-momentum (q T ) distribution of Drell-Yan lepton pairs produced with invariant masses (M) from low values up to the Z-boson peak (4 ≤ M ≤ 116 GeV).
Stefano Camarda, Giancarlo Ferrera, Lorenzo Rossi   +2 more
doaj   +1 more source

Double parton distributions in the leading logarithm approximation of perturbative QCD

, 2003
Recent CDF measurements of the inclusive cross section for a double parton scattering attach a great importance to any theoretical calculations of two-particle distribution functions.
A. Del Fabbro, A. Del Fabbro, A. Kulesza, A. M. Snigirev, B. Humpert, B. Humpert, C. Goebel, F. Abe, G. Altarelli, G. Calucci, G. Calucci, H.L. Lai, K. Konishi, K. Konishi, L.N. Lipatov, M.J. Puhala, N. Paver, R. Kirschner, T. Sjostrand, V.N. Gribov, V.N. Gribov, V.P. Shelest, V.P. Shelest, Yu.L. Dokshitzer   +23 more
core   +1 more source

Parton distribution functions in nuclei [PDF]

, 2001
Optimum nuclear parton distributions are determined by an analysis of muon and electron deep inelastic scattering data. Assuming simple A dependence and polynomial functions of x and 1-x for nuclear modification of parton distributions, we determine the ...
Hirai, M., Kumano, S., Miyama, M.
core   +2 more sources