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28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

HERA data on azimuthal decorrelation and charged particle multiplicity spectra probing QCD dynamics and quantum entanglement effects

28 Jul 2020, 17:40
20m
virtual conference

virtual conference

Talk 06. Strong Interactions and Hadron Physics Strong Interactions and Hadron Physics

Speakers

Dr Zhoudunming Tu (BNL) Zhoudunming Tu (BNL)

Description

The azimuthal decorrelation angle between the leading jet and scattered lepton in deep inelastic scattering is studied with the ZEUS detector at HERA. The data was taken in the HERA II data-taking period and corresponds to an integrated luminosity of 330 pb1. Azimuthal angular decorrelation has been proposed to study the
Q2 dependence of the evolution of the transverse momentum distributions (TMDs) and understand the small-x region, providing unique insight to nucleon structure. Previous decorrelation measurements of two jets have been performed in proton-proton collisions at very high transverse momentum; these measurements are well described by perturbative QCD at next-to-leading order. The azimuthal decorrelation angle obtained in these
studies shows good agreement with predictions from Monte Carlo models including leading order matrix elements and parton showers.

New experimental data on charged particle multiplicity distributions are presented, covering the kinematic ranges in momentum transfer 5<Q2<100 GeV2 and inelasticity 0.0375<y<0.6. The data were recorded with the H1 experiment at the HERA collider in positron-proton collisions at a centre-of-mass energy of 320 GeV. Charged particles are counted with transverse momenta PT>150 MeV and pseudorapidity 1.6<ηlab<1.6 in the laboratory frame, corresponding to high acceptance in the current hemisphere of the hadronic centre-of-mass frame. Charged particle multiplicities are reported on a two-dimensional grid of Q2, y and on a three-dimensional grid of Q2, y, η. The observable is the probability P(N) to observe N particles in the given η region. The data are confronted with predictions from Monte Carlo generators, and with a simplistic model based on quantum entanglement and strict parton-hadron duality.

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Authors

Dr Zhoudunming Tu (BNL) Matthew Wing (University College London) Stefan Schmitt (Deutsches Elektronen-Synchrotron (DE))

Presentation materials