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Soft photon bremsstrahlung at next-to-leading power

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arxiv 2112.08329 v2 pith:66BQ7L4B submitted 2021-12-15 hep-ph hep-exnucl-exnucl-th

Soft photon bremsstrahlung at next-to-leading power

classification hep-ph hep-exnucl-exnucl-th
keywords softphotonbremsstrahlungaliceanalyticbeenconsistencycontext
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The emission of soft radiation provides a fundamental probe of the consistency of the underlying quantum field theory. Correspondingly, the measurement of the soft photon bremsstrahlung, such as the one proposed with the planned future upgrade of the ALICE experiment at the LHC, is of great interest. In this letter we explore the possibility to implement analytic techniques that have been recently developed for soft gluon resummation at Next-to-Leading-Power (NLP) in the context of the soft photon spectrum. We provide a formula for the differential cross-section with shifted kinematics that is particularly suitable for numerical implementations. We also discuss the impact of loop corrections to Low's theorem due to radiative jet functions.

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