I review the theory status of double parton scattering, with emhasis on higher-order raditative corrections.
We present the xFitter project which provides an open-source software framework
for the determination of the proton's parton distribution functions and for the interpretation of the physics analyses in the context of Quantum Chromodynamics.
The project has been used recently for a number of analyses performed by the LHC collaborations and theory community, which are summarised briefly. The...
Calculations for dijet production in diffractive deep-inelastic scattering (DIS) at next-to-next-to-leading order accuracy (NNLO) are presented. The calculations are based on the antenna subtraction formalism and the hard coefficients are convoluted with currently available PDFs for diffractive scattering (DPDFs).
The NNLO predictions are compared to a large number of available measurements...
The strong coupling constant $\alpha_s$ is determined from inclusive jet and dijet cross sections in neutral-current deep-inelastic ep scattering (DIS) measured at HERA by the H1 collaboration using next-to-next-to-leading order (NNLO) QCD predictions. The dependence of the NNLO predictions and of the resulting value of $\alpha_s(m_Z)$ at the $Z$-boson mass $m_Z$ are studied as a function of...
I will present a strong coupling constant extraction at next-to-leading order QCD accuracy using ATLAS Z+2,3,4 jets data. This is the first extraction using processes with a dependency on high powers of the coupling constant. The values of the strong coupling constant at the Z mass obtained are compatible with the world average and with uncertainties commensurate with other next-to-leading...
The strong-coupling constant $\alpha_s(m_Z)$ is measured from the transverse momentum distribution of Z bosons measured at $\sqrt{s} = 1.96$ TeV with the CDF experiment, using predictions based on qt resummation at NNLO+NNLL, as implemented in the DYTURBO program. The measurement is performed through a simultaneous fit of $\alpha_s(m_Z)$, PDFs, and the non-perturbative Sudakov form factor.
https://arxiv.org/abs/1712.00480
Results of the QCD analysis of a variety of the hard-scattering data is overviewed with a particular focus on determination of the quark distributions in the nucleon. A potential of the recent precise data collected at the LHC for the problem of parton species disentangling is discussed and compared to the impact of the low-energy fixed-target data. Finally, remaining challenges and potential...
The talk should cover W, Z/gamma* measurements sensitive to PDFs, as well as measurements of EW observables which are affected by significant PDF uncertainties (sin2thetaW, W mass).
The talk will cover measurements and QCD analyses of inclusive and differential
top quark pairs and single top production, and of jets production, from ATLAS, CMS and LHCb.
Mellin moments of PDFs are calculable as expectation values of local operators within external states, using Lattice QCD. With sufficiently small statistical and systematic uncertainties, these provide information that will be complementary to parametrizations obtained from global fits to experimental data. I will present such lattice results.
I present the recent determination of αs performed by the NNPDF collaboration. I particularly discuss the novel methodology adopted in the fit, as well as the breakdown of the uncertainties.
We will talk about the recent progress in the CTEQ-TEA global analysis.
