Soft Contribution to the Hard Ridge George Moschelli Wayne State University 26,WWND, January 2-10, 2009 Ocho Rios, Jamaica The Ridge Hard Ridge: jet trigger.

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Presentation transcript:

Soft Contribution to the Hard Ridge George Moschelli Wayne State University 26,WWND, January 2-10, 2009 Ocho Rios, Jamaica The Ridge Hard Ridge: jet trigger Soft Ridge: no trigger Flow and jets Long Range Correlations Flux Tubes, Glasma, and Correlations Comparison to Experiment Blast Wave Flow + Glasma p t Dependence Soft and Hard Ridge from STAR arXiv: [nucl-th] GM, Sean Gavin Phys.Rev.C79,051902, arXiv: [nucl-th] Sean Gavin, Larry McLerran, G. M.

Hard Ridge: Jet + Associated Particles Hard Ridge: Near Side Peak Peaked near  = 0 Broad in  STAR: arXiv: Measure High pt trigger Yield of associated particles per trigger How does the formation of the ridge at large  depend on jets?

Soft Ridge: Untriggered Correlations two particle correlations with no jet tag central STAR: arXiv: Soft and Hard Ridges Similar Peaked near  = 0 Wider in  than hard ridge Broad in  Jet peak? Measure peripheral Common Features  width increases with centrality peripheral ~ proton+proton

Near Side  Peak: Flow Fluid cell ~1 fm/cFreeze out Azimuthal correlations come from flow. Particles are pushed to higher p t and and focused to a smaller azimuthal angle depending on the push. The ridge should narrow in  with increasing p t cuts. Mean flow depends on position Opening angle for each fluid element depends on radial position

Near Side  Peak: Jets + Flow Quenched away jet Fluid cell ~1 fm/cFreeze out Jet Correlations With Bulk Correlation of flow and jet particles if produced nearby in transverse plane Surviving jets tend to be more radial, due to quenching. Bulk particles are pushed into the radial direction by flow Claim: Soft ridge explained by bulk flow Hard ridge: additional jet-bulk contribution E. Shuryak, Phys. Rev. C 76, (2007)

Flow Works Takahashi, Tavares, Qian, Grassi, Hama, Kodama, Xu correlations NEXUS strings transverse boost SPHERIO hydro Voloshin; Pruneau, Gavin, Voloshin; Gavin, Moschelli, McLerran; Shuryak; Mocsy & Sorenson Blast Wave Model Hydrodynamics

CGC Flux Tubes Dusling, Gelis, Lappi, & Venugopalan arXiv: Correlations Partons from the same tube are correlated Rapidity reach: Causally disconnected

Flux Tubes and Glasma Flux Tubes: longitudinal fields early on Tubes  quarks+gluons Single flux tube phase space density of gluons Flux tube transverse size Number of flux tubes Gluon rapidity density Kharzeev & Nardi

Flux Tubes and Correlations Long range Glasma fluctuations scale the phase space density Dumitru, Gelis, McLerran & Venugopalan; Gavin, McLerran & GM Correlation Strength Energy and centrality dependence flux tube transverse size ~ Q s -1 << R A Correlation function

Soft Ridge Q s dependence: 200 GeV Au+Au  62 GeV, Cu+Cu Glasma Dependence Blast Wave Boltzmann Dist.  f (p,x) Scale factor to fit 200 GeV only Centrality dependence on blast wave parameters (v and T)  10% uncertainty Blast wave only (dashed) fails

Comparison and LHC LHC Au+Au 200 GeV Au+Au 62 GeV Cu+Cu 62 GeV Cu+Cu 200 GeV Caution: Blast Wave parameters for LHC taken from Au+Au 200 GeV

Soft Ridge: Angular Correlations Peak  Width Fit using Gaussian + offset Range: Error band: 20% shift in fit range Uncertainty due to experimental definition of peak A width is approximately independent of energy The width should decrease with increasing p t range

Most Central  Width vs. p t Soft Ridge vs. p t Jet-Bulk and Jet-Jet correlations should have an increasing effect with p t Jet contributions should force the correlation width to approach the jet correlation width Examine bulk correlations in different p t ranges Most Central Amplitude vs. p t DeSilva arXiv:

Jets + Glasma Correlation strength f(x 1,p 1 )  jet p t range f(x 2,p 2 )  bulk associated p t range Jet-Bulk correlation function

Hard Ridge Narrow

Hard Ridge: Jets + Flow Narrow Wide Jet-Bulk Jet-Bulk width similar to E. Shuryak, Phys. Rev. C 76, (2007)

Hard Ridge: Flow Only Narrow Bulk-Bulk Wide Jet-Bulk Narrow Jet-Bulk width similar to E. Shuryak, Phys. Rev. C 76, (2007)

Hard Ridge dN/dp t constrains jet fraction Bulk particles: Blast Wave Jet particles: Total - BW Jet scale  Q s ; take 1.25 GeV Jets + Flow Fit the Hard Ridge Bulk-Bulk correlations ~70%. Bulk-Bulk + Jet-Bulk better azimuthal agreement Jorn Putschke, QM ‘06

The Ridge: From Soft to Hard Bulk Correlations Amplidude decreases with p t,min Narrow width from flow alone Jet+Bulk Correlations Jet contribution dominates with increasing p t,min  r widening at large p t,min would indicate significant contribution from jet correlations out in the ridge

Summary Ridge Azimuthal Width Flow induces angular correlations Azimuthal width vs. p t can distinguish flow from jets Long Range Correlations Implications on particle production mechanism Glasma + Blast Wave Blast Wave fixed by single particle spectra Glasma fixed by dN/dy and 200 GeV Au+Au Predicts the height and azimuthal width of the Soft and Hard Ridge Predict energy, centrality, system, and p t dependence Bulk Correlations Dominate the Hard Ridge

Backup Slides

PHOBOS: Long Range Correlations long range correlations

Why Long Range Correlations? must originate at the earliest stages of the collision like super-horizon fluctuations in the Universe information on particle production mechanism Dumitru, Gelis, McLerran, Venugopalan, arXiv:

Hard vs. Soft Ridge N. Armesto, C.A. Salgado, U.A. Wiedemann, Phys. Rev. Lett. 93, (2004) P. Romatschke, Phys. Rev. C 75, (2007) A. Majumder, B. Muller, S. A. Bass, Phys. Rev. Lett. 99, (2007) C. B. Chiu, R. C. Hwa, Phys. Rev. C 72, (2005) C. Y. Wong, arXiv: [hep-ph] R. C. Hwa, C. B. Yang, arXiv: [nucl-th] T. A. Trainor, arXiv: [hep-ph] A. Dumitru, Y. Nara, B. Schenke, M. Strickland, arXiv: [hep-ph] E. V. Shuryak, Phys. Rev. C 76, (2007) C. Pruneau, S. Gavin, S. Voloshin, Nucl.Phys.A802: ,2008 S. Gavin and M. Abdel-Aziz, Phys. Rev. Lett. 97, (2006) S. A. Voloshin, Phys. Lett. B 632, 490 (2006) S. Gavin and G. Moschelli, arXiv: [nucl-th] A. Dumitru, F. Gelis, L. McLerran and R. Venugopalan, arXiv: [hep-ph] S. Gavin, L. McLerran, G. Moschelli, arXiv: ; arXiv: [nucl-th] F. Gelis, T. Lappi, R. Venugopalan, arXiv: [hep-ph] J. Takahashi et. al. arXiv: [nucl-th] hard ridge explanations -- jet interactions with matter soft ridge -- similar but no jet -- collective behavior

Blast Wave Single Particle Fits fit momentum spectra in 200 GeV Au+Au 10% systematic uncertainty in scale of v and T Akio Kiyomichi, PHENIX 62 GeV Au+Au: 5% smaller v, 10% smaller T temperature velocity at r = R N part participants N part

Blast Wave and the Correlation Function Schnedermann, Sollfrank & Heinz Single Particle Spectrum A Hubble like expansion in used in a Boltzmann Distribution Correlation Function

Correlation Strength strength K flux tubes, assume K varies event-by-event K flux tubes fluctuations per tubenumber of tubes

Jet Correlation Strength Pruneau, Gavin, Voloshin Phys.Rev. C66 (2002)

Soft Ridge vs. p t Peak Amplitude Au-Au 200 GeV STAR preliminary Most Central Amplitude vs. p t Increase the lower p t limit of the soft ridge calculation toward the hard ridge range. As the lower p t limit is increased less particles are available for correlations. Correlation amplitude for the most central collision plotted vs. the lower p t limit.

Soft Ridge vs. p t Higher p t particles received a larger radial push  narrower relative angle. Peak  Width Au-Au 200 GeV Most Central  Width vs. p t STAR preliminary Angular width from

Quenching + Flow RARA r quenched away jet Survival probability Production probability Jet path Jet Distribution L E. Shuryak, Phys. Rev. C 76, (2007) Surviving jets tend to be more radial, due to quenching.

“Jet-Bulk” correlations “Bulk-Bulk” correlations Two Contributions Blast Wave Invariant Spectrum ptpt Thermal Bulk Jets STAR PRL vol 91, number 17 (2003) Both the Bulk-Bulk and Jet-Bulk contributions are weighted by the fraction of bulk or jet particles to the total.

The Ridge: From Soft to Hard Bulk Correlations Amplidude decreases with p t,min Narrow width from flow alone Jet+Bulk Correlations Jet contribution dominates with increasing p t,min  r widening at large p t,min would indicate significant contribution from jet correlations out in the ridge