A prediction for unintegrated parton distributions

نویسندگان

  • Jianhong Ruan
  • Wei Zhu
چکیده

Unintegrated parton distributions in proton and nucleus are predicted by a modified DGLAP equation incorporating the shadowing corrections, which include exact energy-momentum conservation in each splitting and fusion vertices. We find that the suppression of the unintegrated gluon distribution when kt → 0 may arise from the valence-like input rather than the saturation effect, although the nonlinear shadowing effect is obvious. The comparisons of our prediction with the other parameters of the unintegrated gluon distributions are given.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Unintegrated double parton distributions

We present the construction of unintegrated double parton distribution functions which include dependence on transverse momenta of partons. We extend the formulation which was used to obtain the single unintegrated parton distributions from the standard, integrated parton distribution functions. Starting from the homogeneous part of the evolution equations for the integrated double parton distr...

متن کامل

Unintegrated generalised parton distributions

We show how the generalised (or skewed) parton distributions of the proton,H(x, ξ; k t , μ ), unintegrated over the partonic transverse momenta, can be calculated from the known conventional parton distributions, q(x, μ) and g(x, μ), for small values of the skewedness parameter ξ. We demonstrate the procedure by numerically evaluating the skewed unintegrated gluon. We also provide a simple appr...

متن کامل

Unintegrated parton distributions

We describe how to calculate the parton distributions fa(x, k 2 t , μ 2), unintegrated over the parton transverse momentum kt, from auxiliary functions ha(x, k 2 t ), which satisfy single-scale evolution equations. The formalism embodies both DGLAP and BFKL contributions, and accounts for the angular ordering which comes from coherence effects in gluon emission. We check that the unintegrated d...

متن کامل

Unintegrated parton distributions and inclusive jet production at HERA

We describe how unintegrated parton distributions can be calculated from conventional integrated distributions. We extend and improve the ‘last-step’ evolution approach, and explain why doubly-unintegrated parton distributions are necessary. We generalise ktfactorisation to (z, kt)-factorisation. We apply the formalism to inclusive jet production in deep-inelastic scattering, mainly at leading ...

متن کامل

Unintegrated CCFM parton distributions and transverse momentum of gauge bosons

Transverse momentum distribution of gauge bosons W± and Z is calculated using unintegrated parton distributions obtained by solving leading order CCFM equation(s) in the impact parameter space. For illustration we compare the results of the fixed-order collinear, softgluon resummation and CCFM approaches. A parameter of a nonperturbative form factor is adjusted to the D0 data. In contrast to th...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2009