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Trainor, T. A.; Prindle, D.

doi:10.1103/physrevd.88.094018

Cited by 7 publications

(31 citation statements)

References 34 publications

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“…A 2D TCM for p-p TA correlations F at can be constructed from the 1D SP spectrum TCM [21]. From the TA TCM we obtain 1D and 2D soft-component models that can be subtracted from measured distributions T and A to obtain jet-related trigger hard component Thh and TA conditional hard component R h A hh (y ta |y tt , n ch ).…”

Section: E Modeling the Ta Hard Component With Ffsmentioning

confidence: 99%

“…(2) derived from 200 GeV p-p collisions can be used to define a TCM for 2D TA correlations in the form F at (y ta , y tt , n ch ) = T (y tt , n ch )A(y ta |y tt , n ch ) including soft and hard components as in Ref. [21]. By subtracting a 2D TA soft-component model from the associatedparticle conditional distribution A(y ta |y tt , n ch ) we can isolate a conditional TA hard component of hard events A hh (y ta |y tt , n ch ) that may be compared directly with measured FF systematics and pQCD parton spectra.…”

Section: Trigger-associated Tcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The 1D p t spectrum TCM describes a marginal projection of 2D TA correlations formed by pairing the highestmomentum hadron in each event (trigger particle) with any other hadron (associated particle) [21]. Some fraction of those pairs (the TA hard component, possibly jet related) can be isolated by subtracting a TA TCM softcomponent model [21]. The purpose of the present study is prediction of the 2D TA hard component obtained from p-p data using measured FFs and a MB jet spectrum to confirm a dijet mechanism for the hard component.…”

Section: Introductionmentioning

confidence: 99%

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Predicting minimum-bias trigger-associated dijet correlations inp–pcollisions

Trainor¹

2015

J. Phys. G: Nucl. Part. Phys.

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A method is derived to predict the structure of dijet-related hard components of trigger-associated (TA) hadron correlations from p-p collisions based on measured fragmentation functions (FFs) from e + -e − or p-p collisions and a minimum-bias (MB) jet or scattered-parton spectrum from p-p collisions. The method is based on the probability chain rule and Bayes' theorem and relates a trigger-parton-associated-fragment system from reconstructed dijets to a trigger-hadron-associated hadron system from p-p data. The method is tested in this study by comparisons of FF TA structure with preliminary p-p TA data but can also be applied to p-A, d-A and A-A collisions over a range of energies. Quantitative comparisons of measured TA correlations with FF-derived predictions may confirm a QCD MB dijet mechanism for certain spectrum and correlation structures whose origins are currently questioned and have been attributed by some to collective expansion (flows).

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Section: E Modeling the Ta Hard Component With Ffsmentioning

confidence: 99%

Section: Trigger-associated Tcmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Predicting minimum-bias trigger-associated dijet correlations inp–pcollisions

Trainor¹

2015

J. Phys. G: Nucl. Part. Phys.

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“…The present study extends that program with a method to predict 2D trigger-associated (TA) hadron correlations arising from dijets produced in high-energy p-p collisions based on measured FFs and a large-angle-scattered parton spectrum [19][20][21]. Identification of unique triggereddijet contributions to TA correlations in p-p collisions may then probe the phenomenon of multiple parton interactions (MPI) and test claims of bulk collectivity in p-A, d-A and heavy ion (A-A) collisions at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC).…”

Section: Introductionmentioning

confidence: 95%

QCD prediction of jet structure in 2D trigger-associated momentum correlations and implications for multiple parton interactions

Trainor

2015

EPJ Web of Conferences

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Abstract. The expression "multiple parton interactions" (MPI) denotes a conjectured QCD mechanism representing contributions from secondary (semi)hard parton scattering to the transverse azimuth region (TR) of jet-triggered p-p collisions. MPI is an object of underlying-event (UE) studies that consider variation of TR n ch or p t yields relative to a trigger condition (leading hadron or jet p t ). An alternative approach is 2D triggerassociated (TA) correlations on hadron transverse momentum p t or rapidity y t in which all hadrons from all p-p events are included. Based on a two-component (soft+hard) model (TCM) of TA correlations a jet-related TA hard component is isolated. Contributions to the hard component from the triggered dijet and from secondary dijets (MPI) can be distinguished, including their azimuth dependence relative to the trigger direction. Measured e + -e − and p-p fragmentation functions and a minimum-bias jet spectrum from 200 GeV p-p collisions are convoluted to predict the 2D hard component of TA correlations as a function of p-p collision multiplicity. The agreement between QCD predictions and TA correlation data is quantitative, confirming a dijet interpretation for the TCM hard component. The TA azimuth dependence is inconsistent with conventional UE assumptions.

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Transverse-rapidityytdependence of the nonjet azimuth quadrupole from 62- and 200-GeV Au-Au collisions

2015

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Previous measurements of a quadrupole component of azimuth correlations denoted by symbol v2 have been interpreted to represent elliptic flow, a hydrodynamic phenomenon conjectured to play a major role in noncentral nucleus-nucleus collisions. v2 measurements provide the main support for conclusions that a "perfect liquid" is formed in heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). However, conventional v2 methods based on one-dimensional (1D) azimuth correlations give inconsistent results and may include a jet contribution. In some cases the data trends appear to be inconsistent with hydrodynamic interpretations. In this study we distinguish several components of 2D angular correlations and isolate a nonjet (NJ) azimuth quadrupole denoted by v2{2D}. We establish systematic variations of the NJ quadrupole on yt, centrality and collision energy. We adopt transverse rapidity yt as both a velocity measure and as a logarithmic alternative to transverse momentum pt. Based on NJ quadrupole trends we derive a completely factorized universal parametrization of quantity v2{2D}(yt, b, √ sNN ) which describes the centrality, yt and energy dependence. From yt-differential v2(yt) data we isolate a quadrupole spectrum and infer a quadrupole source boost having unexpected properties. NJ quadrupole v2 trends obtained with 2D model fits are remarkably simple. The centrality trend appear to be uncorrelated with a sharp transition in jet-related structure that may indicate rapid change of Au-Au medium properties. The lack of correspondence suggests that the NJ quadrupole may be insensitive to such a medium. Several quadrupole trends have interesting implications for hydro interpretations.

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Two-component model of 2D trigger-associated hadron correlations on rapidity spaceyta×yttderived from 1Dp

Cited by 7 publications

References 34 publications

Predicting minimum-bias trigger-associated dijet correlations inp–pcollisions

Predicting minimum-bias trigger-associated dijet correlations inp–pcollisions

QCD prediction of jet structure in 2D trigger-associated momentum correlations and implications for multiple parton interactions

Transverse-rapidityytdependence of the nonjet azimuth quadrupole from 62- and 200-GeV Au-Au collisions

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