A new global analysis of deep inelastic scattering data

Abstract

A new QCD analysis of Deep Inelastic Scattering (DIS) data is presented. All available neutrino and anti-neutrino cross sections are reanalysed and included in the fit, along with charged-lepton DIS and Drell-Yan data. A massive factorisation scheme is used to describe the charm component of the structure functions. Next-to-leading order parton distribution functions are provided. In particular, the strange sea density is determined with a higher accuracy with respect to other global fits.Comment: 51 pages, 18 figure

A new evaluation of polarized parton densities in the nucleon

“…However, if one uses the more accurate LO positivity bounds on ∆s(x) obtained by using the unpolarized strange sea density s(x) BP Z (Barone et al [20]), ∆s(x) also lies in the allowed region. It is important to mention that s(x) BP Z is determined with a higher accuracy compared to other global fits.…”

Anatomy of the differential gluon structure function of the proton from the experimental data onF2p(x,Q2)

“…DGSF's are custom-tailored for QCD treatment of hard processes, when one needs to keep track of the transverse momentum of gluons neglected in the standard collinear approximation [9]. In the past two decades DGLAP phenomenology of DIS has become a big industry and several groups -notably GRV [10], CTEQ [11] & MRS [12] and some other [13] -keep continuously incorporating new experimental data and providing the high energy community with updates of the parton distribution functions supplemented with the interpolation routines facilitating practical applications. On the other hand, there are several pertinent issues -the onset of the purely perturbative QCD treatment of DIS and the impact of soft mechanisms of photoabsorption on the proton structure function in the region of large Q 2 being top ones on the list -which can not be answered within the DGLAP approach itself because DGLAP evolution is obviously hampered at moderate to small Q 2 .…”

Light-flavor sea-quark distributions in the nucleon in the SU(3) chiral quark soliton model. I. Phenomenological predictions

“…7 and Fig. 8 especially by using all the presently-available neutrino data also, and they obtained some interesting information even for the asymmetry of the s-ands-quark distributions [47]. This tendency is more clearly seen in the ratio of s(x) ands(x) at Q 2 = 20GeV 2 .…”

“…This tendency is more clearly seen in the ratio of s(x) ands(x) at Q 2 = 20GeV 2 . In [47]. The meaning of the curves are the same as in Fig.…”