Parton distributions incorporating QED contributions

被引：335

作者：

Martin, AD ^{[1
]}

Roberts, RG

Stirling, WJ

Thorne, RS

机构：

[1] Univ Durham, Inst Particle Phys Phenomenol, Durham DH1 3LE, England

[2] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England

[3] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

来源：

EUROPEAN PHYSICAL JOURNAL C | 2005年 / 39卷 / 02期

关键词：

D O I：

10.1140/epjc/s2004-02088-7

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We perform a global parton analysis of deep inelastic and related hard-scattering data, including O(alpha(QED)) corrections to the parton evolution. Although the quality of the fit is essentially unchanged, there are two important physical consequences. First, the different DGLAP evolution of u and d type quarks introduces isospin violation, i.e. u(p) not equal d(n), which is found to be unambiguously in the direction to reduce the NuTeV sin(2) theta(W) anomaly. A second consequence is the appearance of photon parton distributions gamma(x, Q(2)) of the proton and the neutron. In principle these can be measured at HERA via the deep inelastic scattering processes eN --> egammaX; our predictions are in agreement with the present data.

引用

页码：155 / 161

页数：7

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