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Title: Testing hydrodynamic descriptions of p+p collisions at $$\sqrt{s}=7$$ 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 v2. As a result, 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.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1264788
Alternate Identifier(s):
OSTI ID: 1437932
Grant/Contract Number:  
FG02-97ER41014; SC0008132
Resource Type:
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Name: European Physical Journal. C, Particles and Fields Journal Volume: 76 Journal Issue: 7; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
Germany
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Transverse Momentum; Systematic Uncertainty; Bulk Viscosity; Gluon Plasma; Proton Collision

Citation Formats

Habich, M., Miller, G. A., Romatschke, P., and Xiang, W. Testing hydrodynamic descriptions of p+p collisions at $$\sqrt{s}=7$$ s = 7 TeV. Germany: N. p., 2016. Web. doi:10.1140/epjc/s10052-016-4237-z.
Habich, M., Miller, G. A., Romatschke, P., & Xiang, W. Testing hydrodynamic descriptions of p+p collisions at $$\sqrt{s}=7$$ s = 7 TeV. Germany. doi:10.1140/epjc/s10052-016-4237-z.
Habich, M., Miller, G. A., Romatschke, P., and Xiang, W. Tue . "Testing hydrodynamic descriptions of p+p collisions at $$\sqrt{s}=7$$ s = 7 TeV". Germany. doi:10.1140/epjc/s10052-016-4237-z.
@article{osti_1264788,
title = {Testing hydrodynamic descriptions of p+p collisions at $$\sqrt{s}=7$$ s = 7 TeV},
author = {Habich, M. and Miller, G. A. and Romatschke, P. and Xiang, W.},
abstractNote = {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 v2. As a result, 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.},
doi = {10.1140/epjc/s10052-016-4237-z},
journal = {European Physical Journal. C, Particles and Fields},
number = 7,
volume = 76,
place = {Germany},
year = {2016},
month = {7}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1140/epjc/s10052-016-4237-z

Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

Figures / Tables:

Fig. 1 Fig. 1: Unidentified charged hadron multiplicity (left) and pion mean transverse momentum (right) for p+p collisions at $\sqrt{s}$ = 7 TeV. Shown are experimental results from ALICE and SONIC simulations for proton models based on the proton form factor. The error bars for the SONIC simulations include systematic uncertainties formore » the applicability of hydrodynamics obtained from varying second-order transport coefficients; as can be seen, those error bars are significant for neither the multiplicity nor the pion $\langle$pT$\rangle$ , thus indicating robust applicability of hydrodynamics for these quantities. Note that the ‘RND’ model has been run with different shear and bulk viscosities. While the effect of changing the shear viscosity on the multiplicity and transverse momentum is minor (not shown), even a very small bulk viscosity has a large effect on the final pion transverse momentum« less

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Works referenced in this record:

Effect of shear viscosity on spectra, elliptic flow, and Hanbury Brown–Twiss radii
journal, September 2003


Light-heavy-ion collisions: a window into pre-equilibrium QCD dynamics?
journal, July 2015


Bulk and shear viscosities of matter created in relativistic heavy-ion collisions
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    Works referencing / citing this record:

    Do nuclear collisions create a locally equilibrated quark–gluon plasma?
    journal, January 2017


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.