929 research outputs found
Scalar products of Bethe vectors in the 8-vertex model
We obtain a determinant representation of normalized scalar products of
on-shell and off-shell Bethe vectors in the inhomogeneous 8-vertex model. We
consider the case of rational anisotropy parameter and use the generalized
algebraic Bethe ansatz approach. Our method is to obtain a system of linear
equations for the scalar products, prove its solvability and solve it in terms
of determinants of explicitly known matrices.Comment: 57 pages, minor correction
TMD parton densities in associated real and virtual photon and jet production at LHC
We study the associated production of real (isolated) or virtual photons
(with their subsequent leptonic decay) and hadronic jets in proton-proton
collisions at the LHC using the -factorization approach of QCD. The
consideration is based on the off-shell quark-gluon QCD Compton scattering
subprocesses. In the case of virtual photon production, the contributions from
Z boson exchange as well as gamma*-Z interference with the full spin
correlations are included. The transverse momentum dependent (TMD) quark and
gluon densities in a proton are determined from the Kimber-Martin-Ryskin
prescription or Catani-Ciafoloni-Fiorani-Marchesini (CCFM) equation. In the
latter, we restricted to the case where the gluon-to-quark splitting occurs at
the last evolution step and calculate the sea quark density as a convolution of
the CCFM-evolved gluon distribution and the TMD gluon-to-quark splitting
function. Our numerical predictions are compared with the recent experimental
data taken by the ATLAS Collaboration. We discuss the theoretical uncertainties
of our calculations and argue that further studies are capable of constraining
the TMD parton densities in a proton.Comment: 11 pages, 4 figures. arXiv admin note: text overlap with
arXiv:1402.549
On the possibility to detect the Higgs decay in the associated production at the LHC
We investigate the possibility to detect the scalar Higgs boson decay in the associated and production at the LHC using the
-factorization QCD approach. Our consideration is based on the off-shell
(i.e. depending on the transverse momenta of initial quarks and gluons)
production amplitudes of ,
and partonic subprocesses supplemented with the
Catani-Ciafoloni-Fiorani-Marchesini (CCFM) dynamics of parton densities in a
proton. We argue that the signal could be observed at large
transverse momenta near Higgs boson peak despite the overwhelming QCD
background, and point out an important role of angular correlations between the
produced boson and -quarks.Comment: 11 pages, 6 figure
Possible saturation effects at HERA and LHC in the -factorization approach
We consider possible saturation effects in the structure function at
fixed W in HERA energy range and in production at LHC energies in the
framework of facrorization approach.Comment: 5 pages, 3 figures, prepared for the Proceedings of XXXV
International Symposium on Multipaticle Dynamics 2005, Kromeriz, Czech
Republic, Aug. 9-15, 200
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