THE PROCESSES $gg\to\tilde\chi^+_i\tilde\chi^-_j$, $\tilde\chi^0_i\tilde\chi^0_j$ AT HIGH ENERGIES

Autor: F. M. Renard, J. Layssac, G. J. Gounaris

Publikováno v: International Journal of Modern Physics A. 26:1253-1272

According to the helicity conservation (HCns) theorem, the sum of the helicities should be conserved, in any 2-to-2 processes in MSSM with R-parity conservation, at high energies, i.e. all amplitudes violating this rule must vanish asymptotically. Th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b528768964afcbdf7825c507864425e9
https://doi.org/10.1142/s0217751x11052888

A FORTRAN code for γγ→ZZ in SM and MSSM

Autor: G. J. Gounaris, J. Layssac, Th. Diakonidis

Publikováno v: The European Physical Journal C. 50:47-52

Through the present paper, the code gamgamZZ is presented, which may be used to calculate all possible observables related to the process $\gamma \gamma \to ZZ$, in either the Standard Model (SM), or the minimal sypersymmetric standard model (MSSM) w

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::cb82e7804158455c8a6b01fa824c0524
https://doi.org/10.1140/epjc/s10052-006-0202-6

Subleading terms in asymptotic Passarino-Veltman functions

Autor: J. Layssac, G.J. Gounaris, M. Beccaria, Fernand M. Renard

Publikováno v: International Journal of Modern Physics A
International Journal of Modern Physics A, World Scientific Publishing, 2008, 23/12, pp.1839-1862. ⟨10.1142/S0217751X08039839⟩

We write explicit and self-contained asymptotic expressions for the tensorial B, C and D Passarino-Veltman functions. These include quadratic and linear logarithmic terms, as well as subleading constant terms. Only mass-suppressed O(m^2/s) contributi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb5fe7e6baaad591f6ad90c6b089eaeb
https://hdl.handle.net/11587/326749

AZ′with enhanced couplings to quarks: A bridge from CERN LEP 1, SLC, and CDF to LEP 2 anomalies

Autor: Claudio Verzegnassi, Pierre Chiappetta, F. M. Renard, J. Layssac

Publikováno v: Physical Review D. 54:789-797

In order to explain possible departures from the standard model (SM) predictions for {ital b{bar b}} and {ital c{bar c}} production at the {ital Z} peak, we propose the existence of a {ital Z}{sup {prime}} vector boson with enhanced couplings to quar

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a3138b8e0c04427cd504e035f86d1057
https://doi.org/10.1103/physrevd.54.789

Signatures of anomalous couplings in boson pair production throughγγ collisions

Autor: J. Layssac, G. J. Gounaris, F. M. Renard

Publikováno v: Zeitschrift für Physik C: Particles and Fields. 69:505-512

We discuss possible New Physics (NP) effects on the processesγγ →W+W−,ZZ, Zγ, γγ, HH which are observable inγγ collisions. Such collisions may be achieved through laser backscattering at a high energye+e− linear collider. To the extent t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::73ea6c5f25eaa18f8467ff3df45deb3a
https://doi.org/10.1007/bf02907434