Determination of the proton parton density functions at HERA
نویسنده
چکیده
Recent experimental progress on the determination of the parton distribution functions in the proton from the H1 and ZEUS Collaborations at HERA is reported. New QCD fits yielding improved determinations of the parton distribution functions in the proton are described. On one hand, precise measurements of neutral-current deep inelastic scattering at low Q2 have allowed an improved determination of the gluon and sea distributions at low x. On the other hand, the high statistics measurements of high Q2 neutraland charged-current deep inelastic scattering data with electron and positron beams from HERA II help to improve the up-quark and down-quark valence distributions at high x free from those corrections that affect fixed-target DIS data.
منابع مشابه
Impact of future HERA data on the determination of proton parton distribution functions using the ZEUS NLO QCD fit
The high precision and large kinematic coverage of the data from the HERA-I running period (1994-2000) have already allowed precise extractions of proton parton distribution functions. The HERA-II running program is now underway and is expected to provide a substantial increase in the luminosity collected at HERA. In this paper, a study is presented which investigates the potential impact of fu...
متن کاملImpact of future HERA data on the determination of proton parton distribution functions
The high precision and large kinematic coverage of the data from the HERA-I running period (1994-2000) have already allowed precise extractions of proton parton distribution functions. The HERA-II running program is now underway and is expected to provide a substantial increase in the luminosity collected at HERA. In this paper, a study is presented which investigates the potential impact of fu...
متن کاملImpact of future HERA data on the determination of proton parton distribution functions using the ZEUS QCD fit
The high precision and large kinematic coverage of the data from the HERA-I running period (1994-2000) have already allowed precise extractions of proton parton distribution functions (PDFs). The HERA-II running program is now underway and is expected to provide a substantial increase in the luminosity collected at HERA. In this paper, a study is presented which investigates the potential impac...
متن کاملQcd Analyses of Hera Cross Section Data C. Gwenlan on Behalf of the H1 and Zeus Collaborations
The H1 and ZEUS Collaborations have performed new next-to-leading order QCD analyses to determine the parton density functions of the proton. QCD fits are performed using inclusive neutral and charged current deep inelastic scattering cross sections from HERA-I. The fits include a full treatment of experimental systematic uncertainies, taking into account point-to-point correlations. The extrac...
متن کاملMeasurements of Proton Structure Functions, Α S and Parton Distrubution Functions at Hera
The measurement and QCD analysis of neutral and charged current cross sections at HERA are presented. For the kinematic range of four-momentum transfer Q 2 between ≈ 1 GeV 2 and 30000 GeV 2 and Bjorken x between 0.0013 and 0.65 the data are compared to NLO QCD predictions. In dedicated NLO QCD analyses the extraction of the parton distribution functions of the proton is performed. Results for t...
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 2009