A study of the general characteristics of proton-antiproton collisions at √s=0.2 to 0.9 TeV

Albajar, C.; Albrow, M.; Allkofer, O. C.; Andrieu, Bernard; Ankoviak, K.; Apsimon, R.; Astbury, A.; Aubert, B.; Bacci, C.; Bacon, T. C.; Bains, N.; Bauer, G.; Beingessner, S.; Bettini, A.; Bézaguet, A.; Biddulph, P.; Böhn, H.; Böhrer, A.; Bonino, R.; Bos, K.; Botlo, M.; Buschbeck, B.; Busetto, G.; Caner, A.; Casoli, P.; Cavanna, F.; Cennini, P.; Centro, S.; Ceradini, F.; Charlton, D. G.; Ciapetti, G.; Cittolin, S.; Clayton, E. F.; Cline, D.; Colás, J.; Colas, P.; Conte, R.; Coughlan, J. A.; Cox, G.; Dau, D.; Debrion, J. P.; Degiorgi, M.; Negra, M. Della; Demoulin, M.; Denegri, D.; Dibon, H.; Diciaccio, A.; Hedo, F. J. Diez; Dobrzyński, L.; Dorenbosch, J.; Dowell, J. D.; Eggert, K.; Eisenhandler, E.; Ellis, N.; Erhard, P.; Faissner, H.; Fensome, I. F.; Ferrando, A.; Fincke-Keeler, M.; Fortson, L.; Fuess, T. A.; Garvey, J.; Geer, S.; Geiser, A.; Ghiglino, C.; Giraud‐Héraud, Y.; Givernaud, A.; Gonidec, A.; Gregory, Jonathan M.; Haynes, W.J.; Holthuizen, D.; Ikeda, M.; Jank, W.; Jimack, M.; Jorat, G.; Joyce, D.; Kalmus, P. I. P.; Karimäki, V.; Keeler, R.; Kenyon, I. R.; Kernan, A.; Khan, A.; Kienzle, W.; Kinnunen, R.; Krammer, M.; Kroll, J.; Kryn, D.; Lacava, F.; Lammel, S.; Landon, M. P. J.; Leuchs, R.; Levegrün, S.; Lindgren, M.; Linglin, D.; Lipa, P.; Markou, C.; Markytan, M.; Marquina, M. A.; Maurin, G.; McMahon, S. J.; Mendiburu, J. P.; Meneguzzo, A. T.; Merlo, J.-P.; Meyer, T. C.; Moers, T.; Mohammadi, M.; Morgan, K.; Moser, H. G.; Moulin, André; Mours, B.; Müller, Th.; Naumann, L.; Nédélec, P.; Nikitas, M.; Nisati, A.; Norton, A.; O’Dell, V.; Pancheri, G.; Pauß, F.; Petrolo, E.; Mortari, G. Piano; Pietarinen, E.; Pimiä, M.; Placci, A.; Porte, J. P.; Preischl, M.; Prosi, R.; Radermacher, E.; Redelberger, T.; Reithler, H.; Revol, J. P.; Robinson, D.; Rodrigo, T.; Rohlf, J.; Rubbia, C.; Sajot, G.; Salvini, G.; Sass, J.; Samyn, D.; Schinzel, D.; Schröder, M.; Schwartz, A. J.; Scott, W. G.; Seez, C.; Shah, T.; Siotis, I.; Smith, D.; Sphicas, P.; Stubenrauch, C.; Sumorok, K.; Szoncsó, F.; Taurok, A.; Taylor, L.; Have, I. ten; Tether, S.; Thompson, G.; Tscheslog, E.; Tuominiemi, J.; Guchte, W. van de; Dijk, Albert van; Veneziano, S.; Vialle, J.P.; Virdee, T.; Schlippe, W. von; Vrána, J.; Vuillemin, V.; Wacker, K.; Walzel, G.; Wingerter, Isabelle; Wu, X.; Wulz, C.-E.; Yvert, M.; Zaccardelli, C.; Zacharov, I.; Zanello, L.; Zotto, P.

doi:10.1016/0550-3213(90)90493-w

Cited by 342 publications

(252 citation statements)

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“…This parameter k is also a decreasing function of energy in the √ s ≤ 1.8 TeV region. In Figure 4 we have compared experimental data on p T distributions to the mentioned parameterisation, with k given by the multiplicity distribution values at the [16,24]) fitted with the power-law A(1 + bp 2 T ) −k , using, for each energy, the respective value of k obtained from the multiplicity distribution (from Fig. 3), A and b being free parameters.…”

Section: Discussionmentioning

confidence: 99%

Density saturation and the decrease of the normalised width of the multiplicity distribution in high energy pp collisions

et al. 2004

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It is experimentally observed that the width of the KNO multiplicity distribution -or the negative binomial parameter, 1/k-for pp collisions, in the energy region 10 √ s 1800 GeV, is an increasing function of the energy. We argue that in models with parton or string saturation such trend will necessary change: at some energy the distribution will start to become narrower. In the framework of percolating strings, we have estimated the change to occur at an energy of the order of 5-10 TeV.

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Section: Discussionmentioning

confidence: 99%

Density saturation and the decrease of the normalised width of the multiplicity distribution in high energy pp collisions

et al. 2004

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“…The NSD pp results of CMS, ALICE, UA5, and UA1 are from refs. [4,17,22,34,35], respectively. The N part values at different collision energies are different for a fixed centrality bin.…”

Section: Jhep08(2011)141mentioning

confidence: 99%

“…The dpmjet-III model is capable of describing the charged hadron multiplicity in the most-central collisions, but shows a stronger rise with centrality than observed in the data. The measured particle densities provide basic constraints on the initial conditions of the quark-gluon plasma in any hydrodynamical approach employed to study PbPb interactions at the LHC [32].The collision-energy dependence of the measured (dN ch /dη| η=0 )/(N part /2) for 0-5% and 0-70% centrality from this analysis and from ALICE, PHENIX, and PHOBOS can be [4,17,22,34,35], respectively. The N part values at different collision energies are different for a fixed centrality bin.…”

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confidence: 99%

Dependence on pseudorapidity and on centrality of charged hadron production in PbPb collisions at $ \sqrt {{{s_{\text{NN}}}}} = 2.76 $ TeV

Chatrchyan¹,

Nikolić²,

Erbacher³

et al. 2011

J. High Energ. Phys.

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115

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A measurement is presented of the charged hadron multiplicity in hadronic PbPb collisions, as a function of pseudorapidity and centrality, at a collision energy of 2.76 TeV per nucleon pair. The data sample is collected using the CMS detector and a minimum-bias trigger, with the CMS solenoid off. The number of charged hadrons is measured both by counting the number of reconstructed particle hits and by forming hit doublets of pairs of layers in the pixel detector. The two methods give consistent results. The charged hadron multiplicity density, dN ch /dη| η=0 , for head-on collisions is found to be 1612 ± 55, where the uncertainty is dominated by systematic effects. Comparisons of these results to previous measurements and to various models are also presented. Keywords: Hadron-Hadron ScatteringOpen Access, Copyright CERN, for the benefit of the CMS collaboration doi:10.1007/JHEP08(2011)141 The CMS collaboration 21 JHEP08(2011)141 IntroductionQuantum chromodynamics (QCD), the theory of strong interactions, predicts a phase transition at high temperature between hadronic and deconfined matter [1]. Strongly interacting matter under extreme conditions can be studied experimentally using ultrarelativistic collisions of heavy nuclei. The field entered a new era in November 2010 when the Large Hadron Collider (LHC) produced the first PbPb collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV. This represents an increase of more than one order of magnitude over the highest-energy nuclear collisions previously achieved in the laboratory. The multiplicity of charged particles produced in the central-rapidity region is a key observable characterising the properties of the quark-gluon matter created in these collisions [2]. Nuclei are extended objects, and their collisions occur at various impact parameters, referred to as "centralities". The studies of the dependence of the charged particle density on the type of colliding nuclei, on the centre-of-mass energy, and on the collision geometry are important for understanding the relative contributions of hard scattering and soft processes to particle production and provide insight into the partonic structure of the nuclei.-1 - JHEP08(2011)141In this paper we report measurements of the multiplicity density dN ch /dη of primary charged hadrons. The analysis is based on the 2.76 TeV-per-nucleon PbPb collision data recorded by the Compact Muon Solenoid (CMS) detector in December 2010, in runs without magnetic field. The pseudorapidity is defined as η = − ln[tan(θ/2)] with θ the polar angle with respect to the counterclockwise beam direction (the z axis). The number of primary charged hadrons N ch is defined as all charged hadrons produced in an event including decay products of particles with proper lifetimes less than 1 cm.A detailed description of the CMS experiment can be found in ref. [3]. The pixel tracker used for the analysis covers the region |η| < 2.5 and a full 2π in azimuth, with 66M detector channels out of which 97.5% were functional during data...

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“…The ATLAS and ALICE compared their measurements to inclusive cross sections of pp interaction obtained by the UA1 Collaboration [6] at the same energy √ s = 900 GeV. The UA1 data overlaid with the ATLAS, ALICE and CMS data are shown in Fig.1.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1: The ratios of invariant inclusive cross sections of the UA1 [6] to ATLAS [2] (a), ALICE [3] (b) and CMC [1] (c) at √ s = 900 GeV. The shaded areas indicate the errors of the ratios.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the data on proton-proton and proton-antiproton interactions at high energies on basis of the Low Constituents Number Model

Abramovsky¹

2013

Proceedings of XXI International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXI)

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We argue that hadrons production is different in pp and pp interactions at high energies. There is process of hadrons production from three quark strings in pp which is absent in pp. This process grows as (ln √ s) 2 and becomes significant when energy of collision increases. Inclusive cross sections of pp interaction exceed inclusive cross sections of pp. The UA1 data on pp transverse momentum distribution are about 1.2 -1.3 times higher than the CMS, ATLAS and ALICE data on pp at energy √ s = 900 GeV. Question regarding existence of the Pomranchuk theorem demands further investigation on evidence of difference of multiple processes in pp and pp interactions.

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A study of the general characteristics of proton-antiproton collisions at √s=0.2 to 0.9 TeV

Cited by 342 publications

References 57 publications

Density saturation and the decrease of the normalised width of the multiplicity distribution in high energy pp collisions

Density saturation and the decrease of the normalised width of the multiplicity distribution in high energy pp collisions

Dependence on pseudorapidity and on centrality of charged hadron production in PbPb collisions at $ \sqrt {{{s_{\text{NN}}}}} = 2.76 $ TeV

Comparison of the data on proton-proton and proton-antiproton interactions at high energies on basis of the Low Constituents Number Model

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