Measurement of the inclusive production of neutral pions and charged particles on the Z0 resonance

Adeva, B.; Адриани, О.; Aguilar-Benı́tez, M.; Akbari, H.; Alcaraz, J.; Aloisio, A.; Alverson, G.; Alviggi, M. G.; An, Q.; Anderhub, H.; Anderson, A.L.; Andreev, V.; Angelov, T.; Antonov, L.; Antreasyan, D.; Arce, P.; Arefiev, A.; Azemoon, T.; Aziz, T.; Baba, P.V.K.S.; Bagnaia, P.; Bakken, J. A.; Baksay, L.; Ball, R. C.; Banerjee, S.; Bao, J.; Barone, L.; Bay, A.; Becker, U.; Behrens, J.; Beingessner, S.; Bencze, G.; Berdugo, J.; Berges, P.; Bertucci, B.; Betev, B.L.; Biland, A.; Bizzarri, R.; Blaising, J. J.; Blömeke, P.; Blumenfeld, B.; Bobbink, G. J.; Bocciolini, M.; Böck, R.; Böhm, A.; Borgia, B.; Bourilkov, D.; Bourquin, M.; Boutigny, D.; Bouwens, B.; Branson, J. G.; Brock, I. C.; Bruyant, F.; Buisson, Christine; Bujak, A.; Burger, J. D.; Burq, J.P.; Busenitz, J.; Cai, X. D.; Capell, M.; Carbonara, F.; Cardenal, P.; Carminati, F.; Cartacci, A. M.; Cerrada, M.; Cesaroni, F.; Chang, Y. H.; Chaturvedi, U. K.; Chemarin, M.; Chen, A.; Chen, C.; Chen, G.M.; Chen, H.F.; Chen, H.S.; Chen, M.; Chen, M.L.; Chen, W.Y.; Chiefari, G.; Chien, C. Y.; Chollet, F.; Civinini, C.; Clare, I.; Clare, R.; Cohn, H. O.; Coignet, G.; Colino, N.; Commichau, V.; Conforto, G.; Contin, A.; Crijns, F.; Cui, X.; Dai, T.; D’Alessandro, R.; Asmundis, R. de; Degré, A.; Deiters, K.; Dénes, E.; Denes, P.; DeNotaristefani, F.; Dhina, M.; DiBitonto, D.; Diemoz, M.; Diez-Hedo, F.; Dimitrov, H.R.; Dionisi, C.; Divià, R.; Dova, M. T.; Drago, E.; Driever, T.; Duchesneau, D.; Duinker, P.; Durán, I.; Mamouni, H. El; Engler, A.; Eppling, F. J.; Erné, F.C.; Extermann, P.; Fabbretti, R.; Faber, G.; Fabre, Michel; Falciano, S.; Fan, Q.; Fan, Saijun; Fackler, Oliver T.; Fay, J.; Fehlmann, J.; Ferguson, T.; Fernández, G.; Ferroni, F.; Fesefeldt, H.; Field, J. H.; Filthaut, F.; Finocchiaro, G.; Fisher, P. H.; Forconì, G.; Foreman, T.; Freudenreich, K.; Friebel, W.; Fukushima, M.; Gailloud, M.; Galaktionov, Yu.; Gallo, E.; Ganguli, S. N.; Garcı́a-Abia, P.; Gau, S. S.; Gelé, D.; Gentile, S.; Glaubman, M.; Goldfarb, S.; Gong, Z. F.; Gonzales, E.; Gordeev, A.; Göttlicher, P.; Goujon, D.; Gratta, G.; Grinnell, C.; Gruenewald, M. W.; Guanziroli, M.; Guo, J.; Gurtu, A.; Gustafson, H. R.; Gutay, L.; Haan, H.; Hasan, A.; Hauschildt, D.; He, Changda; Hebbeker, T.; Hebert, M.; Herten, G.; Herten, U.; Hervé, A.; Hilgers, K.; Hofer, H.; Hoorani, H. R.; Hsu, L.; Hu, G.; Ille, B.; Ilyas, M. M.; Innocente, V.; Isiksal, E.; Janßen, H.; Jin, B. N.; Jones, L. W.; Kasser, A.; Khan, R. A.; Kamyshkov, Yu.; Karyotakis, Y.; Kaur, M.; Khokhar, S.; Хозе, В. А.; Kienzle‐Focacci, M. N.; Kinnison, W. W.; Kirkby, D.; Kittel, W.; Klimentov, A.; König, A. C.; Kornadt, O.; Koutsenko, V.; Krammer, R.W.; Krämer, T.; Krastev, V.R.; Krenz, W.; Krizmanic, John F.; Kumar, Krishna; Kumar, V.; Kunin, A.; Lalieu, V.; Landi, G.; Lanske, D.; Lanzano, S.; Lebrun, P.; Lecomte, P.; Lecoq, P.; Coultre, P. Le; Lee, D.; Leedom, I.; Goff, J. M. Le; Leistam, L.; Leiste, R.; Lenti, M.; Leonardi, E.; Lettry, J.; Levchenko, P.; Leytens, X.; Li, C.; Li, H.T.; Li, J.F.; Li, L.; Li, P.J.; Li, Q.; Lli, X.G.; Liao, Jiajun; Lin, Z.; Linde, F.L.; Lindemann, B.; Linnhöfer, D.; Liu, R.; Liu, Y.; Lohmann, W.; Longo, E.; Lu, Y. S.; Lubbers, J.M.; Lübelsmeyer, K.; Luci, C.; Luckey, D.; Ludovici, L.; Lue, X.; Luminari, L.; Wen-Gan, Ma; MacDermott, M.; Magahiz, R.; Maire, M.; Malhotra, P.K.; Malik, R. P.; Малинин, А.; Manña, C.; Mao, Dan; Mao, Yajun; Maolinbay, M.; Marchesini, P.; Marchionni, A.; Martin, B.; Martin, J. P.; Martínez-Laso, L.; Marzano, F.; Massaro, G.; Matsuda, Takeshi; Mazumdar, K.; McBride, P.; McMahon, T. J.; McNally, D.; Meinholz, Th.; Merk, M.; Merola, L.; Meschini, M.; Metzger, W. J.; Mei, Yong; Mills, G. B.; Mir, Y.; Mirabelli, G.; Mnich, J.; Möller, Martin; Monteleoni, B.; Morand, G.; Morand, R.; Morganti, S.; Moulai, N. E.; Mount, R.; Müller, S.; Nagy, E.; Napolitano, M.; Newman, H. B.; Neyer, C.; Niaz, M. A.; Niessen, L.; Nowak, H.; Pandoulas, D.; Plášil, F.; Passaleva, G.; Paternoster, G.; Patricelli, S.; Pei, Y. J.; Perret-Gallix, D.; Perrier, J.; Pevsner, A.; Pieri, M.; Piroué, P.; Plyaskin, V.; Pohl, M.; Pojidaev, V.; Produit, N.; Qian, J.; Qureshi, K.N.; Raghavan, R.; Rahal-Callot, G.; Razis, P. A.; Read, K. F.; Ren, D.; Ren, Z.; Reucroft, S.; Ricker, A.; Riemann, S.; Rind, O.; Rippich, C.; Rizvi, Hasan; Roe, B. P.; Röhner, M.; Röhner, S.; Roeser, U.; Romero, L.; Rose, J.; Rosier‐Lees, S.; Rosmalen, R.; Rosselet, Ph.; Rubbia, A.; Rubio, J. A.; Rubio, María Teresa Maza; Ruckstuhl, W.; Rykaczewski, H.; Sachwitz, M.; Salicio, J.; Sanders, G. S.; Sarakinos, M. S.; Sartorelli, G.; Sauvage, G.; Savin, A.; Schegelsky, V. A.; Schmiemann, K.; Schmitz, D.; Schmitz, P.; Schneegans, M.; Schopper, H.; Schotanus, D. J.; Shotkin, S.; Schreiber, H. J.; Schulte, R.; Schulte, Stefan; Schultze, K.; Schütte, J.; Schwenke, J.; Schwering, J.; Sciacca, C.; Scott, I.; Sehgal, R.; Seiler, P.G.; Sens, J.C.; Sheer, I.; Shen, D. Z.; Shevchenko, V.; Shevchenko, S.; Shi, Xiangdong; Shmakov, K.; Shoutko, V.; Shumilov, E.; Smirnov, N.; Soderstrom, E.; Sopczak, A.; Spartiotis, C.; Spickermann, T.; Spiess, B.; Спиллантини, П.; Starosta, R.; Steuer, M.; Stickland, D.; Sticozzi, F.; Stoeffl, W.; Stone, Howard A.; Strauch, K.; Stringfellow, B.; Sudhakar, K.; Sultanov, G.; Sumner, R.L.; Sun, L. Z.; Suter, H.; Sutton, R.B.; Swain, J.; Syed, A.A.; Tang, X. W.; Tarkovsky, E.; Taylor, L.; Timmermans, C.; Ting, Samuel C.C.; Ting, S. M.; Tong, Y.P.; Tonisch, F.; Tonutti, M.; Tonwar, S. C.; Töth, J.; Trowitzsch, G.; Tully, C.; Tung, K. L.; Ulbricht, J.; Urbán, László; Uwer, U.; Valente, E.; Walle, R. T. Van de; Vetlitsky, I.; Viertel, G.; Vikas, P.; Vikas, U.; Vivargent, M.; Vogel, H.; Vogt, H.; Dardel, G. Von; Vorobiev, I.; Vorobyov, A. A.; Vuilleumier, Laurent; Wadhwa, M.; Wallraff, W.; Wang, C.R.; Wang, G.H.; Wang, J.H.; Wang, Q.F.; Wang, X.L.; Wang, Y.F.; Wang, Z.; Wang, Z.M.; Weber, A.; Weber, J.; Weill, R.; Wenaus, T.; Wenninger, J.; White, M. J.; Willmott, C.; Wittgenstein, F.; Wright, D.; Wu, Rui; Wu, S. L.; Wu, S. X.; Wu, Y.; Wysłouch, B.; Xie, Y.; Xu, Y.D.; Xu, Z.; Xue, Z.; Yan, D.S.; Yan, Xu; Yang, B. Z.; Yang, C. G.; Yang, G.; Yang, K.S.; Yang, Qiang; Yang, Z.; Ye, C.H.; Ye, J.B.; Ye, Q.; Yeh, S. C.; Yin, Z.W.; You, J. M.; Yzerman, M.; Zaccardelli, C.; Zehnder, L.; Zemp, P.; Zeng, M.; Zeng, Y.; Zhang, D.H.; Zhang, Z.P.; Zhou, Jianfeng; Zhu, R. Y.; Zhuang, H.L.; Zichichi, A.

doi:10.1016/0370-2693(91)90159-n

Cited by 79 publications

(17 citation statements)

References 40 publications

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“…2.22 (a) (top) Preliminary PHENIX isolated-direct-γ x E distributions for several ranges of isolated-direct-γ p Tt as presented by Justin Frantz at this meeting; (b) (bottom) Same data (using the same symbols) plotted as a function of ξ = ln(1/x E ) compared to TASSO measurements in e + + e − at two values of √ s [63] plotted in either the z or the ξ variable since the energy of the jets for di-jet events was known (Fig. 2.21) [61]. A similar state of affairs exists for direct-γ -hadron correlations in p-p and A+A collisions since, modulo any k T effect, the jet recoiling from a direct-γ has equal and opposite transverse momentum to the precisely measured γ .…”

Section: Medium Modification Of Jet Fragmentationmentioning

confidence: 99%

Successes and failures with hard probes

Tannenbaum

2009

Eur. Phys. J. C

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The two major pillars of searches for the Quark Gluon Plasma have been: J /Ψ suppression, proposed in 1986, and observed at both SPS fixed target energies and at RHIC; and, more recently, the suppression of π 0 with p T ≥ 3 GeV/c by a factor ∼5 in Au+Au central collisions, observed at RHIC in 2001, which had been predicted in advance as a consequence of Landau-PomeranchuckMigdal coherent (gluon) bremsstrahlung by the outgoing hard-scattered partons traversing the medium. However, new effects were discovered and the quality of the measurements greatly improved so that the clarity of the original explanations has become obscured. For instance: J /Ψ suppression is the same at SpS and RHIC. Is it the QGP, comovers, something else? QCD provides beautiful explanations of π 0 and direct γ measurements in p-p collisions but precision fits of the best theories of π 0 suppression barely agree with the Au+Au data. Better data are needed for 10 < p T < 20 GeV/c, systematic errors are needed in theory calculations, the values of parameters of the medium such as q derived from precision fits are the subject of controversy. Baryons are much less suppressed than mesons, leading to an anomalousp/π ratio for 2 ≤ p T ≤ 4.5 GeV/c, but beautiful theoretical explanations of the effect such as recombination do not work in detail. Heavy quarks seem to be suppressed the same as the light quarks, naively arguing against the bremsstrahlung explanation and suggesting exotic, possible transformational explanations. Di-hadron correlations reveal a trigger side ridge, possible Mach cones on the away side, vanishing and reappearance of away jets, both wide and normal jet correlations with and without apparent loss of energy. Can this all be explained consistently? Preliminary results of direct γ production in Au+Au appear to indicate a suppression approaching that of π 0 for p T ≈

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Section: Medium Modification Of Jet Fragmentationmentioning

confidence: 99%

Successes and failures with hard probes

Tannenbaum

2009

Eur. Phys. J. C

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“…More concretely, we fit the experimental distributions to the expression: Each fit has five free parameters for the DG: maximum peak position, total multiplicity, width, skewness and kurtosis. In total, we analyse 32 data-sets from the following experiments: BES at √ s = 2-5 GeV [24]; TASSO at √ s = 14-44 GeV [25,26]; TPC at √ s = 29 GeV [27]; TOPAZ at √ s = 58 GeV [28]; ALEPH [29], L3 [30] and OPAL [7,31] at √ s = 91.2 GeV; ALEPH [32,35], DELPHI [33], OPAL [34] at √ s = 133 GeV; and ALEPH [35] and OPAL [36][37][38] in the range √ s = 161-202 GeV. The total number of points is 1019 and the systematic and statistical uncertainties of the spectra are added in quadrature.…”

Section: Jhep08(2014)068mentioning

confidence: 99%

“…By fitting all the measured e + e − jet distributions in the range of collision energies √ s ≈ 2-200 GeV [7,[24][25][26][27][28][29][30][31][32][33][34][35][35][36][37][38] a value of Λ QCD can be extracted which agrees very well with that obtained from the NLO coupling constant evaluated at the Z resonance, α s (m 2 Z ), in the minimal subtraction (MS) factorisation scheme [39][40][41]. Similar studies -at (N)MLLA+LO accuracy under different approximations, and with a more reduced experimental data-set-were done previously for various parametrizations of the input fragmentation function [42][43][44][45] but only with a relatively modest data-theory agreement, and an extracted LO value of Λ QCD with large uncertainties.…”

Section: Jhep08(2014)068mentioning

confidence: 99%

Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections

Pérez-Ramos

d’Enterria

2014

J. High Energ. Phys.

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The moments of the single inclusive momentum distribution of hadrons in QCD jets, are studied in the next-to-modified-leading-log approximation (NMLLA) including next-to-leading-order (NLO) corrections to the α s strong coupling. The evolution equations are solved using a distorted Gaussian parametrisation, which successfully reproduces the spectrum of charged hadrons of jets measured in e + e − collisions. The energy dependencies of the maximum peak, multiplicity, width, kurtosis and skewness of the jet hadron distribution are computed analytically. Comparisons of all the existing jet data measured in e + e − collisions in the range √ s ≈ 2-200 GeV to the NMLLA+NLO * predictions allow one to extract a value of the QCD parameter Λ QCD , and associated two-loop coupling constant at the Z resonance α s (m 2 Z ) = 0.1195 ± 0.0022, in excellent numerical agreement with the current world average obtained using other methods.

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“…The key to measuring the fragmentation function of the jet of particles from an outgoing hard-scattered parton is to know the energy of the original parton which fragments, as pioneered at LEP [4]. Thus, a measurement of the direct-γ − h correlation from g + q → γ + q, where the h represents charged hadrons opposite in azimuth to the direct-γ, is (apart from the low rate) excellent for this purpose since both the energy and identity of the jet (8/1 u-quark, maybe 8/2 if theq + q → γ + g channel is included) are known to high precision.…”

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confidence: 99%

Fragmentation functions in-medium, two particle correlations and jets in PHENIX at RHIC

Tannenbaum

2012

AIP Conference Proceedings

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Abstract. Latest results from the PHENIX experiment at RHIC on these topics will be presented. Results will be shown for Au+Au compared to p-p collisions as well as compared to results from fully reconstructed jets at LHC. The discovery, at RHIC, that π 0 produced at large transverse momentum, p T , from hard-scattering of the constituent partons of the nucleons in nuclei are suppressed in central Au+Au collisions by roughly a factor of 5 compared to pointlike scaling from p-p collisions is arguably the major discovery in Relativistic Heavy Ion Physics. For π 0 (Fig. 1a) [1] the hard-scattering in p-p collisions is indicated by the power law behavior p −n T with n = 8.1 ± 0.05 for the invariant cross section, Ed

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Measurement of the inclusive production of neutral pions and charged particles on the Z0 resonance

Cited by 79 publications

References 40 publications

Successes and failures with hard probes

Successes and failures with hard probes

Energy evolution of the moments of the hadron distribution in QCD jets including NNLL resummation and NLO running-coupling corrections

Fragmentation functions in-medium, two particle correlations and jets in PHENIX at RHIC

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