QCD@LHC 2018

Session

PDFs, 𝛼ₛ and soft QCD

27 Aug 2018, 14:30

POT/251 (TU Dresden)

50. Double parton scattering: status of theory

Markus Diehl (DESY)

27/08/2018, 14:30

PDFs, 𝛼ₛ and soft QCD

I review the theory status of double parton scattering, with emhasis on higher-order raditative corrections.

83. Recent QCD results from the xFitter project

Alexander Glazov (Deutsches Elektronen-Synchrotron (DE))

27/08/2018, 15:00

PDFs, 𝛼ₛ and soft QCD

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...

77. NNLO QCD predictions for dijet production in diffractive DIS

Daniel Britzger (Max-Planck-Institut für Physik München)

27/08/2018, 15:30

PDFs, 𝛼ₛ and soft QCD

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...

1. Determination of the strong coupling constant alphas(MZ) in next-to-next-to-leading order QCD using H1 jet cross section measurements

Daniel Britzger (Ruprecht Karls Universitaet Heidelberg (DE))

28/08/2018, 14:30

PDFs, 𝛼ₛ and soft QCD

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...

95. Strong coupling constant extraction from high-multiplicity Z+jets observables

Daniel Maitre

28/08/2018, 14:55

PDFs, 𝛼ₛ and soft QCD

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...

87. Determination of $\alpha_s(m_Z)$ from a fit of the Z-boson transverse momentum distribution measured by CDF to NNLO+NNLL predictions

Stefano Camarda (Johannes Gutenberg Universitaet Mainz (DE))

28/08/2018, 15:15

PDFs, 𝛼ₛ and soft QCD

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.

51. Determination of the strong coupling constant from inclusive jet cross section data from multiple experiments

Daniel Savoiu (KIT - Karlsruhe Institute of Technology (DE))

28/08/2018, 15:35

PDFs, 𝛼ₛ and soft QCD

https://arxiv.org/abs/1712.00480

68. Parton distributions from the collider data

Serguei Alekhin (State Res.Center of Russian Feder. Inst.f.High Energy Phys. (IFVE))

30/08/2018, 14:30

PDFs, 𝛼ₛ and soft QCD

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...

63. Drell-Yan measurements and PDFs

Eram Syed Rizvi (Queen Mary, University of London)

30/08/2018, 15:00

PDFs, 𝛼ₛ and soft QCD

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).

84. Top quark and jets measurements sensitive to PDFs

Suman Chatterjee (Tata Inst. of Fundamental Research (IN))

30/08/2018, 15:30

PDFs, 𝛼ₛ and soft QCD

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.

86. Moments of PDFs from Lattice QCD

Prof. Gunnar Bali (Universität Regensburg)

30/08/2018, 16:30

PDFs, 𝛼ₛ and soft QCD

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.

66. A determination of the strong coupling constant from a global QCD analysis

Zahari Dimitrov Kassabov Zaharieva (University of Cambridge (GB))

30/08/2018, 17:00

PDFs, 𝛼ₛ and soft QCD

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.

113. Recent developments in the CTEQ-TEA global analysis

Dr Tie-Jiun Hou (Xinjiang University)

30/08/2018, 17:30

PDFs, 𝛼ₛ and soft QCD

We will talk about the recent progress in the CTEQ-TEA global analysis.

20. Production of Vector bosons in association with Heavy Flavor jets

CMS Collaboration

PDFs, 𝛼ₛ and soft QCD

The associated production of vector bosons, W or Z, and jets originating from heavy-flavour quarks (HF) provide tests of pertubative QCD predictions and to the modelling of HF production. These measurements are sensitive to the heavy quark parton content of the proton and are input to PDF analyses. This talk should cover the recent V+ HF measurement done by the CMS detector.