γγ processes at high energyppcolliders
نویسندگان
چکیده
منابع مشابه
The processes γγ → γγ , γZ , ZZ
The Standard Model contributions to the processes γγ → γγ, γZ and ZZ at sufficiently high energies, are found to be helicity conserving and almost purely imaginary. This is due to the W-loop contribution, which is much bigger than the fermionic ones at such energies. Thus the structure of these amplitudes acquires an impressive simplicity at high energies. Nothing like this appears in other pro...
متن کاملCoupling at γγ Colliders
We study the constraints on the anomalous coupling gZ 5 that can be obtained from the analysis of the reaction γγ → WWZ at future linear ee colliders. We find out that a 0.5 (1) TeV ee collider operating in the γγ mode can probe values of gZ 5 of the order of 0.15 (4.5×10−2) for an integrated luminosity of 10 fb. This shows that the ability to search for this anomalous interaction of the γγ mod...
متن کاملMeasurement of the γγ → π + π − and γγ → K + K − processes at energies of 2 . 4 – 4 . 1 GeV
We have measured ππ and KK production in two-photon collisions using 87.7 fb of data collected with the Belle detector at the asymmetric energy ee collider KEKB. The cross sections are measured to high precision in the two-photon center-of-mass energy (W ) range between 2.4GeV < W < 4.1GeV and angular region |cos θ∗| < 0.6. The cross section ratio σ(γγ → KK)/σ(γγ → ππ) is measured to be 0.89 ± ...
متن کاملFormula Approach to γγ → ππ processes
We analyze the γγ → π 0 π 0 and γγ → π + π − reactions using the master formula approach to chiral symmetry breaking. The pertinent vacuum correlators are estimated at tree level, and the results are compared with one-and two-loop chiral perturbation theory. The Compton scattering amplitude and the pion polarizabilities are also discussed.
متن کاملTriple Vector Boson Processes in γγ Colliders
We study the production of three gauge bosons at the next generation of linear ee colliders operating in the γγ mode. The processes γγ → WWV (V = Z, or γ) can provide direct information about the quartic gauge-boson couplings. We analyze the total cross section as well as several dynamical distributions of the final state particles including the effect of kinematical cuts. We find out that a li...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1994
ISSN: 0556-2821
DOI: 10.1103/physrevd.50.2335