Transverse momentum resummation: general formalism and the case of diphoton production at LHC

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• Francesco Coradeschi (Florence University)
• Friday 01 July 2016, 14:00-15:00
• B1.19, DAMTP.

If you have a question about this talk, please contact Marco Nardecchia.

After reviewing the b-space transverse momentum (qT) resummation formalism in the context of hadron collisions, focusing on the simplest case in which a colorless final state is produced alongside unresolved strongly-interacting particles, I will show the latest results for the production of diphoton pairs at the LHC at NNLO . Besides restoring the predictivity of the perturbative QCD prediction at low qT, the resummation improves the agreement of the theoretical prediction with the experimental data. It is worth noting that the resummation formalism, which is by now very well-established, has several powerful features, such as universality (most of the coefficients needed to implement the calculation are process-independent) and flexibility, allowing for the prediction of more general distributions than just the qT spectrum. In fact, the structure of the resummation formula is closely related to, and helps elucidate, the general structure of IR singularities in QCD .

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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