Quark Matter 2015 - XXV International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

Session

QGP in Small Systems I

28-14

28 Sept 2015, 17:00

Kobe, Fashion Mart, Japan

Conveners

QGP in Small Systems I

• Jiangyong Jia (State University of New York (US))

554. Direct photon production and jet quenching in small systems

Prof. Charles Gale (McGill University)

28/09/2015, 17:00

QGP in Small Systems

Contributed talk

Signatures usually associated with hydrodynamic behavior have been recently observed in high and intermediary multiplicity proton-nucleus (pA) collisions at the LHC. Even though these signals suggest the creation of a strongly coupled quark-gluon plasma (QGP) in such collisions, they do not represent concrete proof. In order to better address this problem, other signals must be...

188. Flow in small systems from parton scatterings

Guo-Liang Ma (Shanghai INstitute of Applied Physics (SINAP), CAS)

28/09/2015, 17:20

QGP in Small Systems

Contributed talk

We show that the incoherent elastic scattering of partons, as present in a multi-phase transport model (AMPT), with a modest parton-parton cross-section of $\sigma$=1.5-3 mb, naturally explains the long-range two-particle azimuthal correlations as observed in p+p and p+Pb collisions for all measured $N_{track}$ and $p_T$ bins by the LHC-CMS experiment [1]. We calculate the elliptic, $v_2$, and...

410. Effects produced by multi-parton interactions and color reconnection in small systems

Guy Paic (Universidad Nacional Autonoma (MX))

28/09/2015, 17:40

QGP in Small Systems

Contributed talk

Multi-parton interactions (MPI) and color reconnection (CR) have raised special interest due to the fact that they can produce QGP-like effects in small systems, specifically, flow-like patterns. Now we will show that the same mechanisms produce an explicit dependence of the $p_{\mathrm{T}}$ spectra with the number of constituent quarks. In addition, a Cronin-like peak, at intermediate transverse...

694. Differential multi-particle correlation measurements for pPb collisions at CMS

Quan Wang (University of Kansas (US))

28/09/2015, 18:00

QGP in Small Systems

Contributed talk

Previous CMS measurements have demonstrated the collective nature of multiparticle correlations in high-multiplicity pPb collisions at the LHC. This collectivity is consistent with a hydrodynamic flow origin. However, it can also be interpreted in terms of initial state effects arising from gluon saturation. The pseudorapidity dependence of the azimuthal Fourier coefficients ($v_n$) is...

457. Light flavour results in p-Pb collisions with ALICE

Antonio Ortiz Velasquez (Universidad Nacional Autonoma (MX))

28/09/2015, 18:20

QGP in Small Systems

Contributed talk

Particle ratios provide insight into the hadrochemistry of the event and the mechanisms for particle production. In Pb-Pb collisions the relative multi-strange baryon yields exhibit an enhancement with respect to pp collisions, whereas the short-lived K${}^{\ast 0}$ resonance is suppressed in the most central events due to re-scattering. Measurements in p-Pb allow us to investigate the development...

369. PHENIX results on collectivity in ${}^3$He$+$Au collisions

shengli huang (PHENIX Collaboration)

28/09/2015, 18:40

QGP in Small Systems

Contributed talk

Collisions of light with heavy ions have been considered control experiments for heavy ion collisions, but measurements of long-range azimuthal correlations of light hadrons in $p(d)$+A collisions at RHIC and LHC challenge this assumption. Hydrodynamic model calculations have been successful in describing experimental results, though alternative explanations involving...