Prospect for a ridge in p+Pb collisions€¦ · Prospect for a ridge in p+Pb collisions Kevin...
Transcript of Prospect for a ridge in p+Pb collisions€¦ · Prospect for a ridge in p+Pb collisions Kevin...
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Prospect for a ridge in p+Pb collisions
Kevin Dusling
North Carolina State UniversityRaleigh, NC 27695
July 30th, 2012
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The Ridge
More than 200 charged particles!
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The RidgeCentralCentral
Min. BiasMin. Bias
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The Ridge
1. There is a clear scale in the data2. It is semi-hard and will be argued to be Qs
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Multiplicity the same as in Cu+Cu !
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Wave function of the proton
Figure courtesy of Francois Gelis
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Growth of gluon distribution function at small x is seen experimentally.
Data / figures from: http://mstwpdf.hepforge.org/
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The role of STRONG color sourcesDiagram: Min. Bias Central
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High multiplicity are b=0 collisions
Dumitru, Gelis, McLerran, Venugopalan, NPA810 91-108 (2008).Dusling, Fernandez-Fraile, Venugopalan NPA828 (2009) 161-177.Gelis, Lappi, McLerran, NPA828 (2009) 149-160.
Emprical: Tribedy, Venugopalan, NPA850 (2011) 136-156. Lattice (CYM): Lappi, Srednyak, Venugopalan, JHEP01 (2010) 066. Schenke, Tribedy, Venugopalan, arXiv:1206.6805
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Forward jet structure
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Gluon radiation
Kuraev, Lipatov, Fadin, Sov.Phys.JETP44 443-450 (1976). Sov.Phys.JETP45 199-204 (1977).
Balitsky, Lipatov, Sov.J.Nucl.Phys 28 822-829 (1978).
As the energy is increased new gluons are emitted with probability
And as long as the density remains low the evolution is linear
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BK Evolution Equation
Balitsky, NPB 463, 99 (1996).Kovchegov, PRD 60, 034008 (1999).
Jalilian-Marian, Kovner, McLerran, Weigert, PRD 55 5414 (1997).Jalilian-Marian, Kovner, Leonidov, Weigert, NPB 504 415 (1997),
PRD 59 014014 (1999).
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NLO BK Equation
Balitsky, Chirilli PRD 77 014019Kovchegov, Weigert NPA 784 188Albacete, Kovchegov PRD 75 125021
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Deep inelastic scattering on the Proton
Albacete, Armesto, Milhano, Salgado; PRD80 (2009) 034031.Quiroga-Arias, Albacete, Armesto, Milhano, Salgado; PRD80 J.Phys.G G38 (2011) 124124.
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Unintegrated gluon distribution
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kT factorization: single gluon production
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kT factorization: double gluon production
Gelis, Lappi, Venugopalan, PRD78, 050419 (2008).PRD78, 054020 (2008).PRD79, 094017 (2009).
Dusling, Gelis, Lappi, Venugopalan, NPA 836 159-182 (2010).
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kT factorization: double gluon production
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Angular Structure
Dumitru, Dusling, Gelis, Lalilian-Marion, Lappi, Venugopalan, PLB 697 12-25 (2011).
Condition for Ridge (Qualitatively):
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Forward jet structure
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Centrality Dependence
Dusling, Venugopalan, PRL 108, 262001 (2012).
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Trigger Dependence
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Blast Wave I
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Blast Wave II
Left: No intrinsic correlation in ∆φ followed by radial boost.
Right: Intrinsic azimuthal correlation followed by boost.
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Blast wave results
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Results for Pb+Pb
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Multiplicity in p+Pb at 5 TeV
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Ridge in p+Pb
Ridge in p+Pb is smaller than in p+p for CMS acceptance.Signal will also have to be pulled from a larger background.
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Understanding the away-side
There is a clear need for evolution between the triggered particles (even for a rapidity gap as small as 2-4 units)
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Jet Structure
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Summary
● Strong color sources lead to enhancement of QCD diagram responsible for near-side enhancement
● Structure of ridge correlation constrains radial flow in p+p
● Radial flow explains identical measurements in Pb+Pb
● Ridge tougher to see in asymmetric collisions
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Backup
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p+p pT distribution
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CMS Acceptance
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BFKL Formalism