Low-virtuality photon transitions γ⁎→ff¯ and the photon-to-jet conversion function : = Low-virtuality photon transitions [gamma]* -> ff- and the photon-to-jet conversion function

Abstract: The calculation of electroweak corrections to processes with jets in the final state involves contributions of low-virtuality photons leading to jets in the final state via the singular splitting γ∗→q¯q. These singularities can be absorbed into a photon-to-jet “fragmentation function”, better called “conversion function”, since the physical final state is any hadronic activity rather than an identified hadron. Using unitarity and a dispersion relation, we relate this γ∗→q¯qconversion contribution to an integral over the imaginary part of the hadronic vacuum polarization and thus to the experimentally known quantity α(5)had(M2Z). Therefore no unknown non perturbative contribution remains that has to be taken from experiment. We also describe practical procedures following subtraction and phase-space-slicing approaches for isolating and cancelling the γ∗→q¯qsingularities against the photon-to-jet conversion function. The production of Z+jet at the LHC is considered as an example, where the photon-to-jet conversion is part of a correction of the order α2/αsrelative to the leading-order cross section

Object Details

• Alternative title: Low-virtuality photon transitions [gamma]* -> ff- and the photon-to-jet conversion function
• Location: Deutsche Nationalbibliothek Frankfurt am Main
• Extent: Online-Ressource
• Language: Englisch
• Notes: Physics letters. B. - 798 (2019) , 134951, ISSN: 1873-2445

Contributors, Places and Time

• Event: Veröffentlichung
• (where): Freiburg
• (who): Universität
• (when): 2020
• Creator: Denner, Ansgar ; Dittmaier, Stefan ; Pellen, Mathieu ; Schwan, Christopher
• Contributor: Theorie der Elementarteilchen und Quantenfeldtheorie

Further information

• DOI: 10.1016/j.physletb.2019.134951
• URN: urn:nbn:de:bsz:25-freidok-1720021
• Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
• Last update: 25.03.2025, 1:45 PM CET