Resonance Production in Two-photon Collisions PDF Download

Author: Robert Christiaan Wilhelmus van Gulik
Publisher:
ISBN: 9789042301757
Category :
Languages : en
Pages : 165

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
Recent experimental progress on resonance formation in photon-photon collisions is reviewed with particular emphasis on the pseudoscalar and tensor nonents and on the .gamma gamma.* production of spin-one resonances. 37 refs., 17 figs., 5 tabs.

Author:
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ISBN:
Category :
Languages : en
Pages :

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The subject of production of resonances via two photons in ee- colliding beams has finally come into its own. In particular, the eta meson is already changing from this year's sensation to next year's normalization. As for the other old physics mesons with even charge conjugation it seems likely that measurements of the scalar and tensor mesons coupling to two photons are quite doable and will be forthcoming. These will yield some interesting information on the quark content of these states and/or the dynamics of their two photon decays. As for the charmonium states, a measurement of some of the two photon decay widths would be quite interesting in terms of the information it gives on the dynamics of this system. However, even at LEP energies the cross sections for production of any particular state are rather small and one must be lucky to have a detectable decay mode or modes with substantial branching fraction. Finally, there is the .pi.° which started the whole subject. A measurement of this coupling is much easier using the complementary technique for determining two photon widths-the Primakoff effect. GAMMA(.pi.° .-->. .gamma gamma.) has long since been measured with high accuracy in this way.

Author: Frederick Edward Butler
Publisher:
ISBN:
Category :
Languages : en
Pages : 238

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Author: D O Caldwell
Publisher: World Scientific
ISBN: 981455460X
Category :
Languages : en
Pages : 532

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The proceedings blend current and future two-photon physics. Developments since the last Photon-Photon Workshop four years ago are summarized, and the future of the field is projected, not only at existing accelerators, but also at heavy-ion colliders B-factories, and especially linear colliders with back-scattered laser beams.

Author: Maria-Novella Kienzle-Focacci
Publisher: World Scientific
ISBN: 9789812380531
Category : Science
Languages : en
Pages : 444

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Book Description
This volume reports on all aspects of high energy photon interactions using both photon and proton targets. Significant new results from the LEP and HERA experiments as well as from CLEO II and BELLE are presented. These data are confronted with diverse theoretical models. In particular, predictions of QCD in both the perturbative and the non-perturbative sector are extensively discussed. The prospects for gamma-gamma physics at future high energy colliders are also reviewed. In total 72 papers are collected.The proceedings have been selected for coverage in: ? Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)

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ISBN:
Category :
Languages : en
Pages :

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A search for the resonant production of high-mass photon pairs is presented. The analysis is based on samples of proton-proton collision data collected by the CMS experiment at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 3.3 inverse femtobarns, respectively. The search focuses on spin-0 and spin-2 resonances with masses between 0.5 and 4 TeV and with widths, relative to the mass, between 1.4E-4 and 5.6E-2. Limits are set on scalar resonances produced through gluon-gluon fusion, and on Randall--Sundrum gravitons. A modest excess of events compatible with a narrow resonance with a mass of about 750 GeV is observed. The local significance of the excess is approximately 3.4 standard deviations. The significance is reduced to 1.6 standard deviations once the effect of searching under multiple signal hypotheses is considered. More data are required to determine the origin of this excess.

Author: Ch Berger
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 448

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Author: Maria-novella Kienzle-focacci
Publisher: World Scientific
ISBN: 9814488232
Category : Science
Languages : en
Pages : 435

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Book Description
This volume reports on all aspects of high energy photon interactions using both photon and proton targets. Significant new results from the LEP and HERA experiments as well as from CLEO II and BELLE are presented. These data are confronted with diverse theoretical models. In particular, predictions of QCD in both the perturbative and the non-perturbative sector are extensively discussed. The prospects for gamma-gamma physics at future high energy colliders are also reviewed. In total 72 papers are collected.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)

Author: Adriaan Buijs
Publisher: World Scientific Publishing Company Incorporated
ISBN: 9789810232443
Category : Science
Languages : en
Pages : 474

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Book Description
The main focus of this book is on experimental results from electron -- positron and electron -- photon colliders and related theoretical questions, particularly on hadron production at energies from 1 to 100 GeV and higher. The topics discussed include photo- and electroproduction of heavy flavours, the photon structure function, total cross section, jet production and resonance production. The future of the field is also discussed, notably experiments at linear photon -- photon colliders and the study of interactions of other gauge bosons than the photon.