We demonstrate the use of symbolic regression in deriving analytical formulas, which are needed at various stages a typical experimental analysis collider phenomenology. As first application, we consider kinematic variables like stransverse mass, ${M}_{T2}$, defined algorithmically through an optimization procedure and not terms formula. then train obtain correct expressions for all known speci...

It is proposed the modification of the Jacobi polynomial expansion method (MJEM) which is based on the application of the truncated moments instead of the full ones. This allows to reconstruct with a high precision the local quark helicity distributions even for the narrow accessible for measurement Bjorken x region using as an input only four first moments extracted from the data in NLO QCD. I...

A homogeneously translucent titanate nanobelt (TNB) suspension was prepared through facile surface modification of pristine TNBs by polymer wrapping with poly(allylamine hydrochloride). The resultant TNB aqueous suspension was found to remain stable for months. The nonlinear optical (NLO) and optical limiting (OL) properties of the TNB suspension were then investigated. We found that the TNB su...

I give an overview of recent progress in the simulation of final states involving top-quarks and vector bosons pair. First I’ll discuss the recently found solutions needed to simulate fully differential top pair production (pp→ bb̄+4 leptons) at NLO+PS accuracy, retaining off-shellness and interference effects exactly. In the second part, I’ll review the MiNLO (Multi-scale Improved NLO) method, ...

A method to calculate heavy flavor visible-level cross sections at Next-to-Leading Order (NLO) in Quantum Chromodynamics (QCD), based on an interface of the FMNR program to Pythia, is described. It uses the NLO prediction at quark level provided by FMNR, with a statistical reduction procedure (REDSTAT) that allows a link to Pythia 6.2 to be made, from where the description of the full hadron fr...

The differential cross section for γ-deuteron Compton scattering is computed to next-to-leading order (NLO) in an effective field theory that describes nucleon-nucleon interactions below the pion production threshold. Contributions at NLO include the nucleon isoscalar electric polarizability from its 1/mπ behavior in the chiral limit. The parameter free prediction of the γdeuteron differential ...

We formulate and discuss generalized bootstrap equations in nonabelian gauge theories. They are shown to hold in the leading logarithmic approximation. Since their validity is related to the self-consistency of the Steinmann relations for inelastic production amplitudes they can be expected to be valid also in NLO. Specializing to the N = 4 SYM, we show that the validity in NLO of these general...

We perform a global parton fit to DIS and related data, including next-to-leading logarithmic (NLL) BFKL resummations in both the massless and massive sectors. The resummed fit improves over a standard next-to-leading order (NLO) DGLAP fit, with a positive definite gluon at the input scale as opposed to the negative gluon seen at NLO. Furthermore, the predicted longitudinal structure function i...

We present measurements of the temporal and polarization dependence of the nonlinear optical (NLO) response of selected organic solvents using our beam deflection (BD) method. These measurements allow us to separately determine the boundelectronic and nuclear responses which then determines the NLO response function. With this NLO response function the outcome of other experiments such as Z-sca...

We have calculated the NLO corrections for the leading twist amplitude of the reaction γ * γ → ππ at large virtuality of the photon and at W 2 ≪ Q 2. With a simple model for the two-pion quark and gluon distribution amplitudes we have estimated that the NLO effects may reduce the leading-order amplitude by as much as 30%. We have found that besides the usual twist-2 quark and gluon operators th...