Unbiased global determination of parton distributions and their uncertainties at NNLO and at LO

被引:202
作者
Ball, Richard D. [3 ,6 ,8 ]
Bertone, Valerio [1 ,4 ]
Cerutti, Francesco [5 ]
Del Debbio, Luigi
Forte, Stefano [2 ]
Guffanti, Alberto [4 ,6 ,8 ]
Latorre, Jose I. [5 ]
Rojo, Juan [1 ,2 ]
Ubiali, Maria [7 ]
机构
[1] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy
[2] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
[3] Univ Edinburgh, Tait Inst, JCMB, KB, Edinburgh EH9 3JZ, Midlothian, Scotland
[4] Univ Freiburg, Inst Phys, D-79104 Freiburg, Germany
[5] Univ Barcelona, Dept Estruct & Constituents Mat, E-08028 Barcelona, Spain
[6] Niels Bohr Inst, Niels Bohr Int Acad, DK-2100 Copenhagen, Denmark
[7] Rhein Westfal TH Aachen, Inst Theoret Teilchenphys & Kosmol, D-52056 Aachen, Germany
[8] Niels Bohr Inst, Discovery Ctr, DK-2100 Copenhagen, Denmark
关键词
DEEP-INELASTIC SCATTERING; DEUTERON STRUCTURE FUNCTIONS; D-ASTERISK(+/-) MESON PRODUCTION; HIGH STATISTICS MEASUREMENT; ASYMPTOTIC VALUES Q(2); PRECISION DETERMINATION; MUON SCATTERING; PROTON; EVOLUTION; QCD;
D O I
10.1016/j.nuclphysb.2011.09.024
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 present a determination of the parton distributions of the nucleon from a global set of hard scattering data using the NNPDF methodology at LO and NNLO in perturbative QCD, thereby generalizing to these orders the NNPDF2.1 NLO parton set. Heavy quark masses are included using the so-called FONLL method, which is benchmarked here at NNLO. We demonstrate the stability of PDFs upon inclusion of NNLO corrections, and we investigate the convergence of the perturbative expansion by comparing LO. NLO and NNLO results. We show that the momentum sum rule can be tested with increasing accuracy at LO. NLO and NNLO. We discuss the impact of NNLO corrections on collider phenomenology, specifically by comparing to recent LHC data. We present PDF determinations using a range of values of alpha(s), m(c) and m(b). We also present PDF determinations based on various subsets of the global dataset, show that they generally lead to less accurate phenomenology, and discuss the possibility of future PDF determinations based on collider data only. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:153 / 221
页数:69
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