Testing Hydrodynamic Descriptions of of p+p Collisions at \sqrt{s}=7 TeV

Abstract

In high energy collisions of heavy-ions, experimental findings of collective flow are customarily associated with the presence of a thermalized medium expanding according to the laws of hydrodynamics. Recently, the ATLAS, CMS and ALICE experiments found signals of the same type and magnitude in ultrarelativistic proton-proton collisions. In this study, the state-of-the-art hydrodynamic model SONIC is used to simulate the systems created in p+p collisions. By varying the size of the second-order transport coefficients, the range of applicability of hydrodynamics itself to the systems created in p+p collisions is quantified. It is found that hydrodynamics can give quantitatively reliable results for the particle spectra and the elliptic momentum anisotropy coefficient $v_2$. Using a simple geometric model of the proton based on the elastic form factor leads to results of similar type and magnitude to those found in experiment when allowing for a small bulk viscosity coefficient.

arXiv comment8 pages, 4 figures; v2: major revisions, expanded and corrected discussion, conclusions unchanged; v3: published version

References in corpus (6)

• The PHOBOS Perspective on Discoveries at RHIC
• Radial and elliptic flow at RHIC: further predictions
• The Effect of Shear Viscosity on Spectra, Elliptic Flow, and HBT Radii
• Hadronic dissipative effects on elliptic flow in ultrarelativistic heavy-ion collisions
• Bulk and shear viscosities of matter created in relativistic heavy-ion collisions
• Shapes of the Proton

Cited by in corpus (32)

• New theories of relativistic hydrodynamics in the LHC era
• Small System Collectivity in Relativistic Hadron and Nuclear Collisions
• One fluid to rule them all: viscous hydrodynamic description of event-by-event central p+p, p+Pb and Pb+Pb collisions at $\sqrt{s}=5.02$ TeV
• Hydrodynamization in kinetic theory: Transient modes and the gradient expansion
• Angular Structure of Jet Quenching Within a Hybrid Strong/Weak Coupling Model
• Measurements of long-range azimuthal anisotropies and associated Fourier coefficients for $pp$ collisions at $\sqrt{s}=5.02$ and $13$ TeV and $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• Do nuclear collisions create a locally equilibrated quark-gluon plasma?
• Relativistic Hydrodynamic Attractors with Broken Symmetries: Non-Conformal and Non-Homogeneous
• Thermodynamics, transport and relaxation in non-conformal theories
• The smallest fluid on earth
• Initial state fluctuations in collisions between light and heavy ions
• Relativistic Fluid Dynamics In and Out of Equilibrium -- Ten Years of Progress in Theory and Numerical Simulations of Nuclear Collisions
• Unified description of hadron yield ratios from dynamical core-corona initialization
• Holographic Collisions in Non-conformal Theories
• Small systems and regulator dependence in relativistic hydrodynamics
• A flow paradigm in heavy-ion collisions
• Origins of collectivity in small systems
• Investigating high energy proton proton collisions with a multi-phase transport model approach based on PYTHIA8 initial conditions
• Monte Carlo Glauber wounded nucleon model with meson cloud
• Hydrodynamic Attractor in a Hubble Expansion
• The Skinny on Bulk Viscosity and Cavitation in Heavy Ion Collisions
• Pre-hydrodynamic evolution in large and small systems
• Far-from-equilibrium attractors with Full Relativistic Boltzmann approach in 3+1 D: moments of distribution function and anisotropic flows $v_n$
• Medium effects for hadron-tagged jets in proton-proton collisions
• System-size dependence of the viscous attenuation of anisotropic flow in p+Pb and Pb+Pb collisions at LHC energies
• Quasi equilibrium state of expanding quantum fields and two-pion Bose-Einstein correlations in $pp$ collisions at the LHC
• Jet suppression in non-conformal plasma using AdS/CFT
• Holographic drag force in non-conformal plasma
• Using the non-hydrodynamic mode to study the onset of hydrodynamic behavior in ultraperipheral symmetric nuclear collisions
• Anisotropic flow and the valence quark skeleton of hadrons
• Finite $V_{2\Delta }$ puzzle in low-multiplicity pp collisions from ultra-long-range azimuthal correlations in the string-shoving model
• Apparent strangeness enhancement from multiplicity selection in high energy proton-proton collisions