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- W2080732036 abstract "The invariant cross sections for direct photon production in hadron-hadron collisions are calculated for several initial energies (SPS, ISR, $mathrm{S}poverline{p}mathrm{S}$, RHIC, Tevatron, LHC) including initial parton transverse momenta within the formalism of unintegrated parton distributions (UPDF). Different approaches from the literature are compared and discussed. A special emphasis is put on the Kimber-Martin-Ryskin (KMR) distributions and their extension into the soft region. Sum rules for UPDFs are formulated and discussed in detail. We find a violation of naive number sum rules for the KMR UPDFs. An interesting interplay of perturbative (large ${k}_{t}^{2}$) and nonperturbative (small ${k}_{t}^{2}$) regions of UPDFs in the production of both soft and hard photons is identified. The ${k}_{t}$-factorization approach with the KMR UPDFs is inconsistent with the collinear approach at large transverse momenta of photons. Kwieciifmmode acute{n}else '{n}fi{}ski UPDFs provide very good description of all world data, especially at super proton synchrotron (SPS) and intersecting storage rings (ISR) energies. Off-shell effects are discussed and quantified. Predictions for the CERN LHC are given. Very forward/backward regions in rapidity at LHC energy are discussed and a possibility to test unintegrated gluon distributions (UGDF) is presented." @default.
- W2080732036 created "2016-06-24" @default.
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- W2080732036 date "2007-01-25" @default.
- W2080732036 modified "2023-09-24" @default.
- W2080732036 title "Parton transverse momenta and direct photon production in hadronic collisions at high energies" @default.
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- W2080732036 doi "https://doi.org/10.1103/physrevd.75.014023" @default.
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