New 5-flavor LO analysis and parametrization of parton distributions in the real photon
نویسندگان
چکیده
F. Cornet, P. Jankowski, M. Krawczyk, and A. Lorca Departamento de Fı́sica Teórica y del Cosmos, Universidad de Granada, Campus de Fuente Nueva, E-18071, Granada, Spain Institute of Theoretical Physics, Warsaw University, ul. Hoża 69, 00-681 Warsaw, Poland CERN, TH Division, CH-1211 Genève 23, Switzerland Deutsches Elektronen-Synchrotron, DESY Zeuthen, Platanenallee 6, D-15738 Zeuthen, Germany ~Received 6 February 2003; published 11 July 2003!
منابع مشابه
A New 5 Flavour LO Analysis and Parametrization of Parton Distributions in the Real Photon
New, radiatively generated, LO quark (u, d, s, c, b) and gluon densities in a real, unpolarized photon are presented. We perform a global 3 parameter fit, based on LO DGLAP evolution equations, to all available data for the structure function F γ 2 (x,Q 2). We adopt a new theoretical approach called ACOT(χ), originally introduced for the proton, to deal with the heavy-quark thresholds. This def...
متن کاملUncertainties of the CJK 5 Flavour LO Parton Distributions in the Real Photon
Radiatively generated, LO quark (u, d, s, c, b) and gluon densities in the real, unpolarized photon, calculated in the CJK model being an improved realization of the CJKL approach, have been recently presented. The results were obtained through a global fit to the experimental F γ 2 (x,Q 2) data. In this paper we present, obtained for the very first time in the photon case, an estimate of the u...
متن کاملCJK- Improved LO Parton Distributions in the Real Photon and Their Experimental Uncertainties
A new analysis of the radiatively generated, LO quark (u, d, s, c, b) and gluon densities in the real, unpolarized photon, improved in respect to our paper [I], is presented. We perform four new global fits to the experimental data for F,Y, two using a standard FFNS approach and two based on ACOT, scheme [2], leading to the FFNSc JK and CJK models. We also present the analysis of the uncertaint...
متن کامل2 00 4 A New 5 Flavour NLO Analysis and Parametrizations of Parton Distributions of the Real Photon
New, radiatively generated, NLO quark (u, d, s, c, b) and gluon densities in a real, unpolarized photon are presented. We perform three global fits, based on the NLO DGLAP evolution equations for Q 2 > 1 GeV 2 , to all the available structure function F γ 2 (x, Q 2) data. As in our previous LO analysis we utilize two theoretical approaches. Two models, denoted as FFNS CJK 1 & 2 NLO, adopt the s...
متن کاملParametrization of polarized parton distributions
We report the polarized parton distributions proposed by the Asymmetry Analysis Collaboration (AAC). Using parametrized distributions at Q 2 =1 GeV 2 and measured A1 data, we determine optimum polarized distributions in the leading order (LO) and next-to-leading order (NLO). We find that the polarized antiquark distribution is not well determined particularly at small x. It could lead to a rath...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2003