arXiv subjects

Ch. Shio

Publications and source records attributed to Ch. Shio.

5 recordsLinked to original sources

arXiv1995

Multiple Gluon Effects in $q+\bar q\to t+\bar t + X$ at FNAL Energies: Semi-Analytical Results

We apply our Yennie-Frautschi-Suura exponentiated cross section formulas for the parton processes $q + {^(} \bar q {^)}{^\prime} \ra q{^\prime}{^\prime} + {^(} \bar q {^)}{^\prime}{^\prime}{^\prime} + n(G)$ to the process $q + \bar q \ra t + \bar t + n(G)$ at FNAL energies, where G is a QCD gluon. We use semi-analytical methods to compute the ratio $r_{exp}=σ_{exp}/σ_B$, where $σ_{exp}$ is our soft gluon YFS exponentiated cross section and $σ_B$ is the Born cross section. For $m_t= 0.176(0.199)$TeV, we get $r_{exp}=1.65(1.48)$, respectively, for $q=u$ for example. These results are not inconsistent with the recent observations by CDF and D0.

hep-ph↗

arXiv1994

Multiple Gluon Effects in Fermion--(Anti)Fermion Scattering at SSC/LHC Energies

We extend the methods of Yennie, Frautschi and Suura (YFS) to compute, via Monte Carlo methods, the effects of multiple gluon emission in the processes $q+q'\to q''+q'''+n(G)$, where $G$ is a soft gluon. We show explicitly that the infrared singularities in the respective simulations are canceled to all orders in $α_s$. Some discussion of this result from the standpoint of confinement is given. More importantly, we present, for the first time ever, sample numerical Monte Carlo data on multiple soft gluon emission in the rigorously extended YFS framework. We find that such soft gluon effects must be taken into account for precise SSC/LHC physics simulations.

hep-ph↗

arXiv1993

Renormalization Group Improved Exponentiation of Soft Gluons in QCD

We extend the methods of Yennie, Frautschi and Suura to QCD for the summation of soft gluon effects in which infrared singularities are cancelled to all orders in $α_s$. An explicit formula for the respective \rngp improved exponentiated cross section is obtained for $q+\bbar{q'}\to q+\bbar{q'}+ n(G)$ at SSC energies. Possible applications are discussed.

hep-ph↗

arXiv1992

Radiative corrections in processes at the SSC

We discuss radiative corrections for interactions in the SSC environment. Based on the theory of Yennie, Frautschi and Suura, we develop appropriate Monte Carlo event generators to compute the background electromagnetic radiation. Our results indicate that multiple-photon effects must be taken into account in the study of SSC physics such as Higgs decay.

hep-ph↗

arXiv1992

Multiple photon effects in fermion-(anti)fermion scattering at SSC energies

We use the theory of Yennie, Frautschi and Suura to realize, via Monte Carlo methods, the process $f\,\bbbarf\to f'\,\bbbarf'+nγ$ at SSC and LHC energies, where $f$ and $f'$ are quarks or leptons. QED infrared divergences are canceled to all orders in perturbation theory. The resulting Monte Carlo event generator, SSC-YFS2, is used to study the effects of initial-state photon radiation on these processes in the SSC environment. Sample Monte Carlo data are presented and discussed. We find that the respective multiple-photon effects must be taken into account in discussing precise predictions for SSC physics processes.

hep-ph↗