A study of coherence of soft gluons in hadron jets

Akrawy, M. Z.; Alexander, G.; Allison, J.; Allport, P. P.; Anderson, K. J.; Armitage, John C.; Arnison, G.; Ashton, P.; Azuelos, G.; Baines, J. T.; Ball, A. H.; Banks, J.; Barker, G. J.; Barlow, R. J.; Batley, J. R.; Becker, J.; Behnke, T.; Bell, K. W.; Bella, G.; Bethke, S.; Biebel, O.; Binder, U.; Bloodworth, I. J.; Bock, P.; Breuker, H.; Brown, R. M.; Brun, R.; Buijs, A.; Burckhart, H.; Capiluppi, P.; Carnegie, R. K.; Carter, A. A.; Carter, J. R.; Chang, C. Y.; Charlton, David; Chrin, J.; Clarke, P. E.L.; Cohen, I.; Collins, W. J.; Conboy, J. E.; Couch, M.; Coupland, M.; Cuffiani, M.; Dado, S.; Dallavalle, G. M.; Debu, P.; Deninno, M.; Dieckmann, A.; Dittmar, M.; Dixit, M. S.; Duchovni, E.; Duerdoth, I. P.; Dumas, D. J.P.; Mamouni, H. El; Elcombe, P. A.; Estabrooks, P. G.; Etzion, E.; Fabbri, F.; Farthouat, P.; Fischer, H. M.; Fong, D. G.; French, M. T.; Fukunaga, C.; Gaidot, A.; Ganel, O.; Gary, J. W.; Gascon, J.; Geddes, N. I.; Gee, C. N. P.; Geich-Gimbel, Ch.; Gensler, S. W.; Gentit, F. X.; Giacomelli, G.; Gibson, V.; Gibson, W. R.; Gillies, J. D.; Goldberg, J.; Goodrick, M. J.; Gorn, W.; Granite, D.; Gross, E.; Grunhaus, J.; Hagedorn, H.; Hagemann, J.; Hansroul, M.; Hargrove, C. K.; Harrus, I.; Hart, J. C.; Hattersley, P. M.; Hauschild, M.; Hawkes, C. M.; Heflin, E.; Hemingway, R. J.; Heuer, R. D.; Hill, J. C.; Hillier, S. J.; Ho, C.; Hobbs, J.; Hobson, P. R.; Hochman, D.; Holl, B.; Homer, R. J.; Hou, S.; Howarth, C. P.; Hughes-Jones, R. E.; Humbert, R.; Igo‐Kemenes, P.; Ihssen, H.; Imrie, D. C.; Jawahery, A.; Jeffreys, P. W.; Jérémie, H.; Jimack, M.; Jobes, M.; Jones, Roger; Jovanović, P.; Karlen, D.; Kawagoe, K.; Kawamoto, T.; Kellogg, R. G.; Kennedy, B. W.; Kleinwort, C.; Klem, D. E.; Knop, G.; Kobayashi, T.; Kokott, T. P.; Köpke, L.; Kowalewski, R.; Kreutzmann, H.; Kroll, J.; Kuwano, M.; Kyberd, P.; Lafferty, G. D.; Lamarche, F.; Larson, W. J.; Layter, J. G.; Dû, P. Le; Leblanc, P.; Lee, A. M.; Lehto, M. H.; Lellouch, D.; Lennert, P.; Lessard, L.; Levinson, L. J.; Lloyd, S. L.; Loebinger, F. K.; Lorah, J. M.; Lorazo, B.; Losty, M. J.; Ludwig, J.; Ma, J.; Macbeth, A. A.; Mannelli, M.; Marcellini, S.; Maringer, G.; Martin, A. J.; Martin, J. P.; Mäshimo, T.; Mättig, P.; Maur, U.; McMahon, Thomas J.; McNutt, J. R.; McPherson, A. C.; Meijers, F.; Menszner, D.; Merritt, F. S.; Mes, H.; Michelini, A.; Middleton, R. P.; Mikenberg, G.; Miller, D. J.; Milstène, C.; Minowa, M.; Mohr, W.; Montanari, A.; Mori, T.; Moss, M. W.; Murphy, P. G.; Murray, W. J.; Nellen, B.; Nguyen, H. H.; Nozaki, M.; O'Dowd, A. J.P.; O’Neale, S. W.; O'Neill, B. P.; Oakham, F. G.; Odorici, F.; Ogg, M.; Oh, H.; Oreglia, M. J.; Orito, S.; Pansart, J. P.; Patrick, G. N.; Pawley, S. J.; Pfister, P.; Pilcher, J. E.; Pinfold, J. L.; Plane, D. E.; Poli, B.; Pouladdej, A.; Pritchard, T. W.; Quast, G.; Raab, J.; Redmond, M. W.; Rees, D. L.; Regimbald, M.; Riles, K.; Roach, C. M.; Robins, S. A.; Rollnik, A.; Roney, J. M.; Rossberg, S.; Rossi, Antônio; Routenburg, P.; Runge, K.; Runólfsson, Ö.; Sanghera, S.; Sansum, R. A.; Sasaki, M.; Saunders, B. J.; Schaile, A. D.; Schaile, O.; Schappert, W.; Scharff-Hansen, P.; Schreiber, S.; Schwarz, J.; Shapira, A.; Shen, B. C.; Sherwood, P.; Simon, A.; Singh, P.; Siroli, G. P.; Skuia, A.; Smith, A. M.; Smith, T. J.; Snow, G. A.; Springer, R. W.; Sproston, M.; Stephens, K.; Stier, H. E.; Ströhmer, R.; Strom, D.; Takeda, Hiroshi; Takeshita, T.; Tsukamoto, T.; Turner, M.; Tysarczyk-Niemeyer, G.; plas, D. Van den; VanDalen, G. J.; Vasseur, G.; Virtue, C. J.; Schmitt, H. von der; Krogh, J. von; Wagner, A.; Wahl, C.; Ward, C. P.; Ward, D. R.; Waterhouse, J.; Watkins, P. M.; Watson, A. T.; Watson, N. K.; Weber, M.; Weisz, S.; Wells, P. S.; Wermes, N.; Weymann, M.; Wilson, G. W.; Wilson, J. A.; Wingerter, Isabelle; Winterer, V. H.; Wood, N. C.; Wotton, S. A.; Wuensch, B. J.; Wyatt, T. R.; Yaari, R.; Yang, Yifan; Yekutieli, G.; Yoshida, Takashi; Zeuner, W. D.; Zorn, G. T.

doi:10.1016/0370-2693(90)91911-t

Cited by 136 publications

(83 citation statements)

References 23 publications

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“…However, that behavior may simply be due to a coupling of soft and hard amplitudes in the free fit, with no physical significance. A significant change in H is expected at largern ch based on known jet physics: larger fragment multiplicities are produced by more energetic partons, with fragment distributions shifted to larger y t [13]. Thus, the mean and width of H should increase withn ch at some point, but such changes are not observed beyond statistics within the y t andn ch acceptances of this study.…”

Section: Discussionmentioning

confidence: 65%

“…The Gaussian shape of H 0 y t inferred from this analysis can be compared with fragmentation functions from jet analysis of p-p, e-p, and e-e collisions plotted on logarithmic variable p lnfp jet =p fragment g, which also have an approximately Gaussian shape [29] explained in a QCD context as the interplay of parton splitting or branching at larger p t and the nonperturbative cutoff of the branching process at smaller p t due to gluon coherence [30,31]. The Gaussian parameters are predicted by the pQCD modified leading-log approximation (MLLA) [32].…”

Section: Discussionmentioning

confidence: 99%

“…We adopt two new analysis techniques: (1) We introduce transverse rapidity y t [11,12] as an alternative to p t . y t has the advantage that spectrum structure associated with hard parton scattering and fragmentation is more uniformly represented on a logarithmic variable: y t corresponds to variable p ln p parton =p fragment conventionally used to describe parton fragmentation functions in elementary collisions [13]. A simple description of soft particle production is not compromised by the choice of transverse rapidity.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Multiplicity dependence of inclusiveptspectra fromp−pcollisions ats=2

Adams¹,

Aggarwal²,

Ahammed³

et al. 2006

Phys. Rev. D

123

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We report measurements of transverse momentum p t spectra for ten event multiplicity classes of p-p collisions at s p 200 GeV. By analyzing the multiplicity dependence we find that the spectrum shape can be decomposed into a part with amplitude proportional to multiplicity and described by a Lévy distribution on transverse mass m t , and a part with amplitude proportional to multiplicity squared and described by a Gaussian distribution on transverse rapidity y t . The functional forms of the two parts are nearly independent of event multiplicity. The two parts can be identified with the soft and hard components of a two-component model of p-p collisions. This analysis then provides the first isolation of the hard component of the p t spectrum as a distribution of simple form on y t .

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Section: Discussionmentioning

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multiplicity dependence of inclusiveptspectra fromp−pcollisions ats=2

Adams¹,

Aggarwal²,

Ahammed³

et al. 2006

Phys. Rev. D

123

View full text Add to dashboard Cite

show abstract

“…Fragmentation functions (FFs) are conventionally represented on linear momentum fraction x p = p/p jet or ξ p = ln(1/x p ), whereas the format most relevant to nuclear collisions is on rapidity y = ln{2(E + p)/m 0 } or normalized rapidity u = (y − y min )/(y max − y min ), with y max = ln(2p jet /m 0 ) and y min ∼ 1/3 for e + -e − collisions [27]. [29] are plotted on linear momentum fraction x p on the left, and on normalized rapidity u on the right. Less than 10% of the distribution falls to the right of the dotted line in each panel.…”

Section: B Plotting Formatsmentioning

confidence: 99%

Examination of the relevance of hydrodynamics for data measured at the BNL relativistic heavy ion collider

Trainor¹

2010

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

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The hydrodynamic (hydro) model applied to heavy ion data from the relativistic heavy ion collider (RHIC) in the form of single-particle spectra and correlations seems to indicate that a dense QCD medium nearly opaque to partons, a strongly-coupled quark-gluon plasma (sQGP), is formed in more-central Au-Au collisions, and that the sQGP may have a very small viscosity ("perfect liquid"). Measurements of radial and elliptic flows, with possible coalescence of "constituent quarks" to form hadrons, seem to support the conclusion. However, other measurements provide contradictory evidence. Unbiased angular correlations indicate that a large number of back-to-back jets from initial-state scattered partons with energies as low as 3 GeV survive as "minijet" hadron correlations even in central Au-Au collisions, suggesting near transparency. Two-component analysis of single-particle hadron spectra reveals a corresponding spectrum hard component (parton fragment distribution described by pQCD) which can masquerade as "radial flow" in some spectrum analysis. Reinterpretation of "elliptic flow" as a QCD scattering process resulting in fragmentation is also possible. In this paper I review analysis methods and results in the context of two paradigms: the conventional hydrodynamics/hard-probes paradigm and an alternative quadrupole/minijets paradigm. Based on re-interpretation of fiducial data I argue that hydrodynamics may not be relevant to RHIC collisions. Collision evolution may be dominated by parton scattering and fragmentation, albeit the fragmentation process is strongly modified in more-central A-A collisions.

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“…At large x p the distribution reflects energy conservation during parton splitting [14,15]. At small x p the shape is determined by quantum coherence of gluon emission [16,17]. The FF data in this study are hadron distributions reported on momentum fraction x p or logarithmic variable ξ p ≡ ln(1/x p ).…”

Section: Analysis Methodsmentioning

confidence: 99%

Fragmentation in e+e- collisions

Kettler¹,

Trainor²

2007

Proceedings of Correlations and Fluctuations in Relativistic Nuclear Collisions — PoS(CFRNC2006)

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We analyze the energy scale dependence of fragmentation functions from e + -e − collisions using conventional momentum measures x p and ξ p and rapidity y. We find that replotting fragmentation functions on normalized rapidity u results in a compact form precisely represented by the beta distribution, its two parameters varying slowly and simply with parton energy scale Q. The resulting parameterization enables extrapolation of fragmentation functions to small Q in order to describe fragment distributions at low transverse momentum p t in heavy ion collisions at RHIC.

show abstract

A study of coherence of soft gluons in hadron jets

Cited by 136 publications

References 23 publications

Multiplicity dependence of inclusiveptspectra fromp−pcollisions ats=2

Multiplicity dependence of inclusiveptspectra fromp−pcollisions ats=2

Examination of the relevance of hydrodynamics for data measured at the BNL relativistic heavy ion collider

Fragmentation in e+e- collisions

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