e + e? annihilation at high energies and search for thet-quark continuum contribution

Brandelik, R.; Braunschweig, W.; Gather, K.; Kadansky, V.; Lübelsmeyer, K.; Mättig, P.; Martyn, H. U.; Peise, G.; Rimkus, J.; Sander, H. G.; Schmitz, D.; Dratzig, A. Schultz von; Trines, D.; Wallraff, W.; Boerner, H.; Fischer, H. M.; Hartmann, H.; Hilger, E.; Hillen, W.; Knop, G.; Leu, P.; Löhr, B.; Wedemeyer, R.; Wermes, N.; Wollstadt, M.; Cassel, D. G.; Heyland, D.; Hultschig, H.; Joos, P.; Koch, W.; Koehler, P.; Kötz, U.; Kowalski, H.; Ladage, A.; Lüke, D.; Lynch, H. L.; Mikenberg, G.; Notz, D.; Pyrlik, J.; Riethmüller, R.; Schliwa, Manfred; Söding, P.; Wiik, B.H.; Wolff, G.; Fohrmann, R.; Holder, M.; Poelz, G.; Ringel, Jeanne S.; Römer, O.; Rüsch, R.; Schmüser, Peter; Binnie, D. M.; Dornan, P. J.; Downie, N. A.; Garbutt, D. A.; Jones, W. G.; Lloyd, S. L.; Pandoulas, D.; Pevsner, A.; Sedgbeer, J. K.; Yarker, S.; Youngman, C.; Barlow, R. J.; Cashmore, R. J.; Illingworth, J.; Ogg, M.; Roe, B.P.; Salmon, G.L.; Bell, K. W.; Chinowsky, W.; Foster, B.; Hart, J. C.; Proudfoot, J.; Quarrie, D. R.; Saxon, D. H.; Woodworth, P.L.; Eisenberg, Y.; Karshon, U.; Revel, D.; Ronat, E.; Shapira, A.; Freeman, J.; Lecomte, P.; Meyer, T.; Wu, S. L.; Zobernig, G.

doi:10.1007/bf01554391

Cited by 29 publications

(8 citation statements)

References 28 publications

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“…There are smooth dependencies of experimental S on √ s for various interactions without qualitative changes at transition from intermediate energy domain to high energies ( Fig.2a). Taking into account general view of sphericity dependence on initial energy and results for e + e − [27,39], in the present paper the S (s) is approximated by power function…”

Section: Energy Dependencementioning

confidence: 99%

Event Shapes for Hadronic Final State: Experimental Review

Okorokov

2012

Int. J. Mod. Phys. A

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Analysis is presented for first moments of collective observable distributions in two-jet events for various interaction types and for wide initial energy range. These observables include sphericity, thrust, components of transverse particle momentum, alignment and planarity. Database of experimental results created in the framework of the paper includes data for all interactions. Energy dependencies of average values for collective observables excepting of transverse momentum components show universal behavior for various interactions. Thus energy dependence for these parameters supposes the descriptions by functions which are universal for different interaction types. Particle transverse momentum as well as it's components increase faster for e + e − interaction with growth of √ s, than that for other interactions. Empirical analytical

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Section: Energy Dependencementioning

confidence: 99%

Event Shapes for Hadronic Final State: Experimental Review

Okorokov

2012

Int. J. Mod. Phys. A

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“…collisions between ffiffi ffi s p ¼ 12 GeV and 31. 6 GeV, which gave rise to many important results. PETRA continued working until 1986, and its attained highest collision energy was 46.8 GeV.…”

Section: Petra Period (1978-)mentioning

confidence: 99%

“…The first results concerning the t quark search using the data taken until 1979 were given by MARK J, 2) PLUTO, 3) JADE, 4),5) and TASSO. 6) New flavor quark pair production in e D e ! collisions should enhance the multihadronic event rate, so that the search was made through measurements of the R value:…”

Section: Top Quark Searchmentioning

confidence: 99%

Experimental verification of the standard model of particle physics

Kobayashi

2021

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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The history concerning an experimental verification of the standard model of particle physics is reviewed with special emphasis on results from experiments using the highestenergy particle colliders, namely, PETRA, LEP and LHC. This article covers physics subjects from discovering the gluon and precise measurements at LEP, to discovering the Higgs boson. It also covers some searches for physics beyond the standard model, particularly supersymmetry, as well as recent developments of some particle detectors that were used in those experiments.

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“…The present work was supported in part by the grant INTAS-94-3986. [16], DM2 [17], MARKIII [6], DASP [8].…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…In the case of ψ(2S) the pion form factor can be evaluated with the formula similar to Eq. (7) and gives, using the earlier DASP data [8], the figure of |F π (m 2 ψ(2S) )| 2 = (36 ± 23) × 10 −3 . This is especially surprising since shows, guided by the central figure, the rise of the form factor with the energy increase, but, certainly, experimental error is too large.…”

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confidence: 92%

Electromagnetic form factors in theJ/ψmass region: The case in favor of additional resonances

Achasov

Кожевников

1998

Phys. Rev. D

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Using the results of our recent analysis of e + e − annihilation, we plot the curves for the diagonal and transition form factors of light hadrons in the time-like region up to the production threshold of an open charm quantum number. The comparison with existing data on the decays of J/ψ into such hadrons shows that some new resonance structures may be present in the mass range between 2 GeV and the J/ψ mass. Searching them may help in a better understanding of the mass spectrum in both the simple and a more sophisticated quark models, and in revealing the details of the three-gluon mechanism of the OZI rule breaking in KK channel.PACS numbers: 13.25. Gv, 13.40.Gp, 14.40.Cs, 14.40.Gx Typeset using REVT E X * e-mail: achasov@math.nsc.ru † e-mail: kozhev@math.nsc.ru 1 There are intentions to study the energy range of e + e − annihilation in the interval of the center-of-mass energy from 2E = 1.5 GeV up to m J/ψ using the collider VEPP-4M [1]. The BEPC e + e − collider team has also a plan to study some exclusive channels in the energy range from 2 to 5 GeV [2]. This raises the question of comparison of the results of existing analysis of the diagonal and transition form factors of light hadrons in the energy range between 1 and 2 GeV [3,4] with the data now existing at the J/ψ mass. Here we perform this task, in order to uncover possible surprises that might be revealed in future experiments. We use the following formulas expressing the cross sections through corresponding form factors.where p h is the modulus of the 3-momentum of the hadron h in the center-of-mass system of e + e − beams, whose total energy is √ s. The cross section for π + π − is given by Eq. (2.1) of the paper [3]. The cross section for K + K − is given by Eq. (2.1) of the paper [4]. If the final state is V P , wherewhere p V P is the modulus of the 3-momentum of the hadron V (or P ) in the center-of-mass system of e + e − beams. The cross section for V P final state is given by Eq. (2.1) of the paper [3]. If the final state is 2πwhere cross section for the production of 2π + 2π − is given by Eq. (2.8) of Ref.[3], andThe Okubo-Zweig-Iizuka (OZI) rule violating decays of the cc quarkonia into the light hadrons are divided into two very different classes. The isovector states π + π − , ωπ 0 , ρη and ρ 0 π + π − are produced predominantly via the one photon (γ) intermediate state. The threegluon (ggg) contribution which violates the conservation of isospin should be suppressed. Indeed, in the π + π − channel, the ratio of the coupling constant due to three gluons to that due to one photon is estimated aswhere α = 1/137, α s ≃ 0.2 is the QCD coupling constant, and f J/ψ enters the expression for the leptonic width of the J/ψ in a usual way:Inserting m d − m u ≃ 3 MeV, choosing conservatively Q ∼ m π , and taking the vectorfor the pion form factor, one gets the figure of 10 −2 for above ratio. Similar estimate holds for other isovector channels cited above. The amplitude with ggγ in intermediate state is also expected to be suppressed [5...

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e + e? annihilation at high energies and search for thet-quark continuum contribution

Cited by 29 publications

References 28 publications

Event Shapes for Hadronic Final State: Experimental Review

Event Shapes for Hadronic Final State: Experimental Review

Experimental verification of the standard model of particle physics

Electromagnetic form factors in theJ/ψmass region: The case in favor of additional resonances

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