Initial Stages 2021

Session

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13 Jan 2021, 18:45

Andrea's room 3 (vDLCC)

Conveners

PDF: 1

• Carlos Albert Salgado Lopez (Universidade de Santiago de Compostela (ES))

PDF: 2

• Michael Klasen

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• Julia Velkovska (Vanderbilt University (US))

58. Low-$p_T$ $e^+e^{-}$ pair production in Au+Au collisions and exclusive $J/\psi$ production in d+Au collisions at STAR

Xiaofeng Wang (Shandong University)

13/01/2021, 18:45

Partonic structure of protons and nuclei

oral

In ultrarelativistic heavy-ion collisions, strong electromagnetic fields arising from the Lorentz-contraction of highly charged nuclei generate a large flux of quasi-real photons. STAR measurements of the Breit-Wheeler photon-photon fusion process in Ultra-Peripheral Collisions (UPC) have recently demonstrated that the colliding photons are linearly polarized and that the linear polarization...

122. Hard probes production in pPb collisions at LHCb

Mr Yiheng Luo (Tsinghua University (CN))

13/01/2021, 19:05

Partonic structure of protons and nuclei

oral

Within the p-Pb data sample collected by the LHCb detector at sqrt(s_NN) = 8.16 TeV, a rich set of open charm hadrons is observed with abundant statistics.
Thanks to the LHCb forward acceptance that is complementary to general purpose detectors, with excellent performance in particle reconstruction and identification,these charm states are studied down to zero pT with overwhelming precision....

120. Probing the nucleus with linearly polarized photons

Dr James Brandenburg (Brookhaven National Laboratory)

13/01/2021, 19:25

Partonic structure of protons and nuclei

oral

The intense electromagnetic fields produced by ultra-relativistic heavy nuclei have been proposed as a source of quasi-real photons i.e. in the Weizsacker-Williams equivalent photon method. A photon from one nucleus can fluctuate into a quark antiquark pair and interact directly with the other nucleus to produce a vector meson (e.g. $\rho^0$). Recent STAR measurements of the Breit-Wheeler...

251. Invited: Status of nPDF.

Prof. Martha Constantinou (Temple University)

14/01/2021, 15:30

invited

208. Heavy gauge boson and photon production for initial state constraints with ALICE

Sizar Aziz (Université Paris-Saclay (FR))

14/01/2021, 15:55

Partonic structure of protons and nuclei

oral

The parton distribution functions of nuclei are not well constrained for most of the kinematic domain probed with heavy-ion collisions at the LHC. Direct photons in proton-nucleus, W and Z boson production in proton-nucleus and nucleus-nucleus collisions at the LHC can be used to constrain the nuclear parton distribution functions. In this contribution, we present recent results on W- and...

74. PHENIX Results on $J/\psi$ production in small systems

John Matthew Durham (Los Alamos National Laboratory)

14/01/2021, 16:15

Partonic structure of protons and nuclei

oral

The production of heavy quarkonia states in p+A collisions is sensitive to a range of initial- and final-state effects that must be quantified in order to fully understand the dynamics of heavy quarks in the QCD medium. One way to disentangle the various effects is by measuring charmonia production in different rapidity and momentum regions, using various beam species. Here we present...

124. Charmonia photo-production in ultra-peripheral and peripheral PbPb collisions with LHCb

Roman Litvinov (Universita e INFN, Cagliari (IT))

14/01/2021, 16:35

Partonic structure of protons and nuclei

oral

In 2018, LHCb recorded ~210 microbarn^{-1} integrated luminosity of PbPb
collisions at sqrt(s_NN) = 5.02 TeV. With an increase of the luminosity by a
factor 20 compared to the previous 2015 PbPb dataset, precise measurements on
photo-produced charmonia in ultra-peripheral collisions are foreseen. Moreover,
the great momentum resolution of the detector allows to study photo-produced
J/psi...

206. New results on ultra-peripheral collisions with ALICE

Roman Lavicka (Czech Technical University in Prague (CZ))

14/01/2021, 17:10

Partonic structure of protons and nuclei

oral

Photon-induced reactions in ultra-peripheral collisions (UPCs) of Pb-emphasized textPb nuclei at the LHC have been studied using the ALICE detector for several years. The ALICE detector can measure the photoproduction cross section for vector mesons at various rapidities, centre-of-mass energies and collision systems. This process allows us to study the energy evolution of the gluon content of...

117. Heavy Quark Energy Loss and Angular Distribution of the Radiation in the Moller Theory

Boris Blok (Physics Department)

14/01/2021, 17:30

Partonic structure of protons and nuclei

oral

We calculate the energy loss and angular radiation distribution for heavy quark propagating through the quark-gluon plasma at the LHC in the framework of the QCD extended Moller theory i.e. BDMPS formalism plus large Coulomb logarithms. We study the role of Coulomb Logarithms in heavy quark propagation. We calculate the energy loss and estimate the Quenching Weights both including the phase...

212. Measurement of initial stages via color neutral probes in pPb and PbPb with the CMS detector

Austin Alan Baty (Rice University (US))

14/01/2021, 17:50

Partonic structure of protons and nuclei

oral

The electroweak process is often used to probe the parton distribution functions (PDFs) in a proton and the nuclear parton distribution functions (nPDFs) in heavy ions. In this presentation, the measurements of the Drell-Yan process in pPb collisions at 8.16 TeV and of Z bosons decaying to pairs of leptons in PbPb collisions using data collected at 5.02 TeV from the CMS experiment at the LHC...