Direct photon production and PDF fits reloaded
نویسندگان
چکیده
منابع مشابه
Resummations in PDF fits
In this contribution I discuss recent and ongoing progress on the inclusion of resummation effects in the fit of parton distributions. Current state-of-the-art PDF sets [1, 2, 3, 4, 5, 6, 7] are fitted from data assuming fixed-order theory at LO, NLO or NNLO. The DGLAP evolution is consistently included at LL, NLL or NNLL, respectively. The quest for precision at the LHC often requires theoreti...
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At HERA heavy quarks may contribute up to 30% of the structure function F2. The potential of including heavy-quark data in the ZEUS PDF fits is explored, using D∗ double differential cross-sections as well as the inclusive quantities F cc̄ 2 , F cc̄ 2 . The introduction of heavy quarks requires an extension of the DGLAP formalism. The effect of using different heavy flavour number schemes, and di...
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We present a method for very fast repeated computations of higher-order cross sections in hadron-induced processes for arbitrary parton density functions. A full implementation of the method for computations of jet cross sections in Deep-Inelastic Scattering and in Hadron-Hadron Collisions is offered by the “fastNLO” project. A web-interface for online calculations and user code can be found at...
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We study the nuclear dependences of high-p T jet cross sections in one photon and one jet production in proton-nucleus collisions. We find that there exist asymmetries between the outgoing jets and photons. A convincing reason responsible for those asymmetries are demonstrated in perturbative QCD. Significant nuclear enhancements are also found in the inclusive jet cross sections. Anomalous nuc...
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We present the computation of the direct photon production cross-section in perturbative QCD to all orders in the limit of high partonic center-of-mass energy. We show how the high-energy resummation can be performed consistently in the presence of a collinear singularity in the final state, we compare our results to the fixed order NLO cross-section in MS scheme, and we provide predictions at ...
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ژورنال
عنوان ژورنال: The European Physical Journal C
سال: 2018
ISSN: 1434-6044,1434-6052
DOI: 10.1140/epjc/s10052-018-5944-4