The Forward Physics Facility (FPF) is a proposal to enlarge an existing cavern in the far-forward region of ATLAS to house a suite of experiments with groundbreaking new capabilities for many Standard Model studies and new physics searches. Although existing LHC detectors have great coverage of the central region, the production of particles in the far-forward direction is poorly constrained....
Two far-forward experiments are currently taking data during Run 3 at the Large Hadron Collider (LHC): FASERnu [1] and SND@LHC [2]. They are sensitive to some classes of BSM particles, muons and neutrinos produced in the ATLAS interaction point (IP) and propagating for several hundred meters along the tangent to the accelerator beamline, up to two caverns located in opposite directions with...
We calculate the Next-to-Leading Order (NLO) virtual correction to the Higgs-induced DIS in the infinite top mass limit. Since we want to use this result in the framework of $k_t$-factorization to resum small-x logarithms up to Next-to-Leading-Logarithm (NLL), we work in light-cone gauge and we keep the incoming gluon off-shell. This choice raises many challenging points like the presence of...
We address the issue of negative total cross sections for inclusive hadroproduction of pseudoscalar quarkonia ($\eta_Q$) and photoproduction of vector quarkonia ($\psi$, $\Upsilon$) at increasing energies in NLO collinear-factorisation computations in the $\overline{MS}$ scheme. We discuss two solutions:
- fixing the factorisation scale to avoid an over-subtraction of the collinear...
It is widely recognized that high-energy calculations performed via the NLL BFKL resummation of energy logarithms suffer from strong instabilities that become manifest when renormalization and factorization scales are varied from their natural values, namely the ones dictated by kinematics. In the case of observables featuring light-particle emissions, such as Muller--Navelet and...
We present high-accuracy QCD predictions for the transverse-momentum (qT) distribution and fiducial cross sections of Drell-Yan lepton pairs produced in hadronic collisions. At small values of qT we resum to all perturbative orders the logarithmically enhanced contributions up to next-to-next-to-next-to-leading logarithmic (N3LL) accuracy, including all the next-to-next-to-next-to-leading...
I describe resummation of colour-singlet transverse momentum and related observables in momentum space, as well as ensuing recent fiducial predictions in Drell Yan at third order in perturbation theory.
In this talk, I will disucss a framework to resum soft and next-to-soft enhanced logarithms to all orders in perturbative QCD. These large logarithms are comprises of distributions log^i (1−z)/(1−z) resulting from soft plus virtual (SV) and logarithms of the kind log^i(1−z) from next to SV (NSV) contributions. We use collinear factorisation and renormalisation group invariance as the...
Parton branching methods underlie the Monte Carlo (MC) generators, being therefore of key importance for obtaining high energy physics predictions.
We construct a new parton branching algorithm which for the first time incorporates the off-shell, transverse-momentum dependent (TMD) splitting functions, defined from the high-energy limit of partonic decay amplitudes.
Based on these TMD...
We present a full NLO result for the forward Higgs boson impact factor, obtained in the infinite top-mass limit. We discuss problems associated with a high-energy computation in the presence of the Higgs-gluons effective vertex.
This impact factor is a key ingredient to describe the inclusive hadroproduction of a forward Higgs in the limit of small Bjorken x, as well to study inclusive...
I present prediction for cross section of Mueller-Tang jets (jet-gap-jet) processes at LHC, obtained by using the BFKL approach, where both impact factors and gluon Green functions are calculated in the next-to-leading logarithmic approximation (NLLA). I discuss also the issue of the validity of the standard BFKL factorization for such processes, and show that the actual violation is small,...
