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Gamma-gamma collider is a challenging new type of particle collider that can produce complementary and unique new physics compared to other type of colliders (hh, ee and eh). It can be used as a Higgs...
K(S)-]GAMMA-GAMMA, K(L)-]PI(0)GAMMA-GAMMA AND UNITARITY
Γ agreement experimental value lap chiral perturbation theory the dispersion relation
2014/12/23
Agreement between the experimental value Γ(KS→γγ) and the number predicted via a one-loop chiral perturbation theory calculation has been cited as a success for the latter. On the other hand the one-l...
THE REACTIONS GAMMA-GAMMA-]WL(+)WL(-) AND GAMMA-GAMMA-]Z(L)Z(L) IN SU(N) STRONGLY INTERACTING THEORIES
Low energy inflation models fermion
2014/12/23
In theories in which the parameters of the low energy theory are not unique, perhaps having different values in different domains of the universe as is possible in some inflationary models, the fermio...
Decay pi(0)->gamma gamma to next to leading order in chiral perturbation theory
Decay of amplitude induced mixing pure state low energy
2014/12/20
The π0→γγ decay width is analyzed within the combined framework of chiral perturbation theory and the 1/Nc expansion up to O(p6) and O(p4×1/Nc) in the decay amplitude. The η′ is explicitly included in...
Starting from hyperbolic dispersion relations, we derive a system of Roy--Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and crossing symmetry.
Starting from hyperbolic dispersion relations, we derive a system of Roy--Steiner equations for pion Compton scattering that respects analyticity, unitarity, gauge invariance, and crossing symmetry. I...
Measurement of the gamma gamma* --> eta_c transition form factor
gamma gamma momentum transfer
2010/3/15
We study the reaction e+e- --> e+e- eta_c, eta_c --> K_S K+- pi-+ and obtain eta_c mass and width values 2982.2+-0.4+-1.6 MeV/c^2 and 31.7+-1.2+-0.8 MeV, respectively. We find Gamma(eta_c --> gamma ga...
Observation of the chi_c2(2P) meson in the reaction gamma gamma -> D Dbar at BABAR
chi_c2(2P) meson DDbar system integrated luminosity
2010/3/15
A search for the Z(3930) resonance in gamma gamma production of the DDbar system has been performed using a data sample corresponding to an integrated luminosity of 384 fb^-1 recorded by the BABAR exp...
Extensions of the Extrema Bounds for the Pomeron Intercept to Meson-Proton, Gamma-Proton and Gamma-Gamma Scattering
the Extrema Bounds the Pomeron Intercept Meson-Proton Gamma-Proton Gamma-Gamma Scattering
2010/10/19
Making use of the extrema bounds for the soft pomeron intercept, recently determined by fits to pp and ¹pp data (from both accelerator and cosmic-ray experiments), we investigate the total cross ...