Phenomenology 2015 Symposium

Session

QCD II

4 May 2015, 16:30

University of Pittsburgh

Conveners

QCD II

• Fatima Machado

1. PDFs for Run 2 at the LHC

Prof. Joey Huston (Michigan State University (US))

04/05/2015, 16:30

parallel talk

New generations of PDFs have recently been developed by the major global PDF fitting groups. In addition, new techniques have also been developed towards more efficient calculations of PDF uncertainties using the error PDFs from those groups. I will discuss developments in both areas and their implications for Run 2 physics.

28. Recent results on jets, alpha_s extraction and PDFs from CMS

Fred Stober (KIT - Karlsruhe Institute of Technology (DE))

04/05/2015, 16:45

parallel talk

Recent jets results from CMS at a centre of mass energy of 7 and 8 TeV are presented. The comparison with predictions from perturbative QCD at next-to-leading order allow the inference of important theory parameters from these measurements. Particular emphasis is put on the determination of parton distribution functions of the proton and the confirmation of the running and value of the strong...

200. Recent QCD results from ATLAS

Javier Llorente Merino (Universidad Autonoma de Madrid (ES))

04/05/2015, 17:00

NLO & QCD

parallel talk

The ATLAS collaboration has performed studies of a wide range of QCD phenomena, from soft particle to hard photon and jet production. Recent soft-QCD measurements include studies of the underlying event properties, polarisation of Lambda particles and Bose-Einstein correlations. The measurement of diffractive di-jet production with a large rapidity gap devoid of hadronic activity tests the...

6. D± production asymmetry at the LHC from heavy quark recombination mechanism

Lai Wai Kin (University of Pittsburgh)

04/05/2015, 17:15

parallel talk

The asymmetry in the forward region production cross section of D± is calculated using the heavy quark recombination mechanism for pp collisions at 7 TeV. By suitable choices of four nonperturbative parameters, our calculated results can reproduce those obtained at LHCb. We find A p ∼ −1% when integrated over 2.0 GeV < p T < 18 GeV and 2.2 < η < 4.75, which agrees with A p = −0.96 ± 0.26 ±...

50. Quarkonia production with the ATLAS experiment

Benjamin Weinert

04/05/2015, 17:30

parallel talk

ATLAS has a wide program to study the production cross section and decay properties of the charmonium and bottomonium states. This presentation will cover ATLAS results in the domain of charmonium production, including J/psi, psi(2s) and chi_c states, as well as exotic state X(3872) and search for its bottomonium couterpart X_b in several possible decay channels. We also review the studies of...

88. Diquark bound states at far beyond ladder truncation

Go Mishima (Japan/U-Tokyo)

04/05/2015, 17:45

parallel talk

The Bethe-Salpeter equation in the diquark channel is investigated by employing the Dyson-Schwinger method together with the Munczek-Nemirovsky model. The novelty of our study is a resummation of completely-crossed ladder diagrams in the Bethe-Salpeter kernel. These diagrams are enhanced due to their color factors in the diquark channel, but not in the meson channel. As a result of our...

142. An independent data analysis of the proton size puzzle

John Martens (University of Kansas)

04/05/2015, 18:00

parallel talk

Recent experiments indicate the proton radius in muonic hydrogen is about 4% smaller than the proton radius in ‘ordinary’ hydrogen. Previous analysis puts the size of the discrepancy at 7 sigma if the 'ordinary' radius is calculated from a combination of spectroscopy and electron-proton scattering data. Same analysis however is found to be excessively sensitive to a single transition whose...