Showing 2004 · hep-phShow all

12 papers · 2 filters

hep-ph2004

Transversity of quarks and nucleons in SIDIS and Drell Yan

Leonard P. Gamberg

We consider the leading and sub-leading twist -odd and even contributions to the azimuthal asymmetry in unpolarized dilepton production in Drell-Yan Scattering and sem…

hep-ph2004★ 16 cited

On the universality of cross sections of hadron-hadron(nuclei) collisions at superhigh energies

L. Frankfurt, M. Strikman, M. Zhalov

We analyze the pattern of the onset of complete absorption (the black limit) in the high energy hadron-hadron collisions. The black limit arises due to the hard and soft interactio…

hep-ph2004★ 15 cited

Initial State Parton Showers Beyond Leading Order

John C. Collins, Xiaomin Zu

We derive a new method for initial-state collinear showering in Monte-Carlo event generators which is based on the use of unintegrated parton correlation functions. Combined with a…

hep-ph2004★ 18 cited

3D parton imaging of the nucleon in high-energy pp and pA collisions

L. Frankfurt, M. Strikman, C. Weiss

We discuss several examples of how the transverse spatial distribution of partons in the nucleon, as well as multiparton correlations, can be probed by observing hard processes (di…

hep-ph2004★ 18 cited

Factorization of Hard Processes in QCD

John C. Collins, Davison E. Soper, George Sterman

We summarize the standard factorization theorems for hard processes in QCD, and describe their proofs.

hep-ph2004★ 1 cited

Higgs Boson Production in gamma-gamma Collisions via Resolved Photon Contributions

Stephen Godfrey, Shou-Hua Zhu, M. A. Doncheski

We studied single Higgs boson production in collisions proceeding via the hadronic content of the photon. For SM Higgs masses of current theoretical interest, the resolved pho…

hep-ph2004★ 26 cited

High-density QCD and Cosmic Ray Air Showers

H. J. Drescher, A. Dumitru, M. Strikman

We discuss particle production in the high-energy, small-x limit of QCD where the gluon density of hadrons is expected to become nonperturbatively large. Strong modifications of th…

hep-ph2004★ 360 cited

Universality of soft and collinear factors in hard-scattering factorization

John C. Collins, Andreas Metz

Universality in QCD factorization of parton densities, fragmentation functions, and soft factors is endangered by the process dependence of the directions of Wilson lines in their…

hep-ph2004★ 83 cited

Observations on dA scattering at forward rapidities

V. Guzey, M. Strikman, W. Vogelsang

We point out that the suppression in the ratio R_dAu recently observed by the BRAHMS collaboration in forward scattering is stronger than usually appreciated. This is related to th…

hep-ph2004★ 4 cited

Entropy for Color Superconductivity in Quark Matter

D. E. Miller, A. Tawfik

We study a model for color superconductivity with both three colors and massless flavors including quark pairing. By using the Hamiltonian in the color-flavor basis we can calculat…

hep-ph2004★ 70 cited

Electroweak baryogenesis and primordial hypermagnetic fields

Gabriella Piccinelli, Alejandro Ayala

The origin of the matter-antimatter asymmetry of the universe remains one of the outstanding questions yet to be answered by modern cosmology and also one of only a handful of prob…

hep-ph2004★ 16 cited

The effects of colored quark entropy on the bag pressure

David E. Miller, Abdel-Nasser Tawfik

We study the effects of the ground state entropy of colored quarks upon the bag pressure at low temperatures. The vacuum expectation values of the quark and gluon fields are used t…