Diphoton production at hadron colliders: transverse-momentum resummation at next-to-next-to-leading logarithmic accuracy

Abstract

Abstract:We consider the transverse-momentum (q T ) distribution of a diphoton pair produced in hadron collisions. At small values of q T , we resum the logarithmically-enhanced perturbative QCD contributions up to next-to-next-to-leading logarithmic accuracy. At intermediate and large values of q T , we consistently combine resummation with the known next-to-leading order perturbative result. All perturbative terms up to order α 2 S are included in our computation which, after integration over q T , reproduces the known nextto-next-to-leading order result for the diphoton pair production total cross section. We present a comparison with LHC data and an estimate of the perturbative accuracy of the theoretical calculation by performing the corresponding variation of scales. In general we observe that the effect of the resummation is not only to recover the predictivity of the calculation at small transverse momentum, but also to improve substantially the agreement with the experimental data.

Vector boson production at hadron colliders: transverse-momentum resummation and leptonic decay

“…[40][41][42], which can be applied to a generic process in which a high-mass system of non strongly-interacting particles is produced in hadronic collisions [41,42,[60][61][62][63][64][65][66][67][68][69][70][71][72][73][74]. Other phenomenological studies of the DY q T distribution, which combine resummed and fixed-order perturbative results at different levels of theoretical accuracy, can be found in refs.…”

“…We implement a procedure that is described in appendix A, and that is practically equivalent to compute the Born level distribution dσ (0) /dΩ of eqs. (2.5) and (2.12) in the Collins-Soper rest frame [94] (this is exactly the same procedure as used in other resummed calculations [74,[77][78][79]). As explained in section 2, the DYRes resummed calculation uses a smooth switching procedure (see eq.…”

reSolve — A transverse momentum resummation tool

“…(a) Diphoton -We first describe the diphoton process inputs. These include boxflag which allows the user to include (1) or not (0) the gg → γγ box diagram (see figure 2), or even to only have this contribution to the process (boxflag= 2). There are then the diphoton cuts, these are: crack1/2 which indicate if a crack in the rapidity sensitivity of the detector is present (often 1.37 to 1.56 for the LHC); etaCut which should be less than or equal to Min(|eta Min|,|eta Max|); and pT 1cut and pT 2cut, which cut based on the q T of the photons.…”

Diphoton excess at 750 GeV: gluon–gluon fusion or quark–antiquark annihilation?

“…In the SM, transverse-momentum resummation for diphoton has been considered at Next-to-Next-to-Leading Logarithm (NNLL) level [58]. Fully differential distribution is also known at fixed next-to-next-to-leading order (NNLO) [46].…”