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Multihadronic events at Ec.m.= 29 GeV and predictions of QCD models from Ec.m.= 29 GeV to Ec.m.= 93 GeV

A. Petersen, G. S. Abrams, C. Adolphsen, C. Akerlof, J. Alexander, M. Alvarez, D. Amidei, A. R. Baden, J. Ballam, B. C. Barish, T. Barklow, B. A. Barnett, J. Bartelt, D. Blockus, G. Bonvicini, A. M. Boyarski, J. Boyer, B. Brabson, A. Breakstone, J.-M. Brom, F. Bulos, P. R. Burchat, D. L. Burke, F. Butler, F. Calviño, R. J. Cence, J. Chapman, D. Cords, D. P. Coupal, H. DeStaebler, D. E. Dorfan, J. Dorfan, P. S. Drell, G. J. Feldman, E. Fernández, R. C. Field, W. T. Ford, C. Fordham, R. Frey, D. Fujino, K. K. Gan, G. Gidal, L. Gladney, T. Glanzman, Michael S. Gold, G. Goldhaber, L. Golding, A. Green, P. Grosse-Wiesmann, J. S. Haggerty, G. Hanson, R. Harr, F. A. Harris, C. M. Hawkes, K. Hayes, D. Herrup, C. A. Heusch, T. Himel, Michael E. Hoenk, R. J. Hollebeek, D. P. Hutchinson, J. Hylen, W. R. Innes, M. Jaffré, J. A. Jaros, I. Juricic, J. A. Kadyk, D. Karlen, J. Kent, S. R. Klein, Akihiro Koide, W. Koska, W. Kozanecki, A. J. Lankford, R. R. Larsen, B. W. LeClaire, M. E. Levi, Z. Li, A. M. Litke, N. S. Lockyer, C. Matteuzzi, J. A. J. Matthews, D. I. Meyer, B. D. Milliken, K. C. Moffeit, Laura Müller, J. Nash, M. E. Nelson, D. Nitz, H. Ogren, R. A. Ong, K. O’Shaughnessy, S. I. Parker, C. Peck, M. Perl, M. Petradza, F. C. Porter, P. Rankin, B. Richter, K. Riles, P. C. Rowson, D. R. Rust, H. F-W. Sadrozinski, T. Schaad, T. Schalk, H. Schellman, W. B. Schmidke, A.S. Schwarz, A. Seiden, P. Sheldon, J. G. Smith, A. Snyder, E. Soderstrom, D. P. Stoker, R. Stroynowski, R. Thun, G. H. Trilling, R. Tschirhart, C. de la Vaissiere, R. Van Kooten, H. Veltman, P. Voruganti, S. R. Wagner, P. Weber, A. J. Weinstein, A. J. Weir, S. Weisz, S. L. White, E. Wicklund, D. Wood, D. Y. Wu, J. Yelton

Open publisher page 124 citations

Abstract

Multihadronic ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, ${Q}_{2}$-${Q}_{1}$, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, ${p}_{\ensuremath{\perp}}$, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the ${Z}^{0}$, are also presented.

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What this paper is about

Multihadronic ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, ${Q}_{2}$-${Q}_{1}$, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, ${p}_{\ensuremath{\perp}}$, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the ${Z}^{0}$, are also presented.

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Available abstract

Multihadronic ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation events at a center-of-mass energy of 29 GeV have been studied with both the original (PEP 5) Mark II and the upgraded Mark II detectors. Detector-corrected distributions from global shape analyses such as aplanarity, ${Q}_{2}$-${Q}_{1}$, sphericity, thrust, minor value, oblateness, and jet masses, and inclusive charged-particle distributions including x, rapidity, ${p}_{\ensuremath{\perp}}$, and particle flow are presented. These distributions are compared with predictions from various multihadron event models which use leading-logarithmic shower evolution or QCD matrix elements at the parton level and string or cluster fragmentation for hadronization. The new generation of parton-shower models gives, on the average, a better description of the data than the previous parton-shower models. The energy behavior of these models is compared to existing ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ data. The predictions of the models at a center-of-mass energy of 93 GeV, roughly the expected mass of the ${Z}^{0}$, are also presented.

Key concepts: Physics, Hadronization, Parton shower, Quantum chromodynamics, Annihilation, Particle physics, Electron–positron annihilation, Hadron

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Multihadronic events at Ec.m.= 29 GeV and predictions of QCD models from Ec.m.= 29 GeV to Ec.m.= 93 GeV — Research Paper | ScholarLens