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M. Pizzio

Publications and source records attributed to M. Pizzio.

5 recordsLinked to original sources
arXiv1997

QCD corrections to $e^+ e^- \to u~\bar d~s~\bar c$ at Lep 2 and the Next Linear Collider: CC11 at O(α_s)

QCD one-loop corrections to the full gauge invariant set of electroweak diagrams describing the hadronic process $e^+ e^- \to u~\bar d~s~\bar c$ are computed. Four-jet shape variables for $WW$ events are studied at next-to-leading order and the effects of QCD corrections on the determination of the $W$--mass in the hadronic channel at Lep 2 and NLC is discussed. We compare the exact calculation with a ``naive''approach to strong radiative corrections which has been widely used in the literature.

hep-ph↗
arXiv1997

QCD corrections to charged current processes at the Next Linear Collider: CC10, CC11 and CC20 at O(alpha_s)

One-loop QCD corrections to the full gauge invariant set of electroweak diagrams describing the charged current processes $e^+ e^- \to u \bar d μ\barν_μ$ (CC10), $e^+ e^- \to u \bar d e^- \barν_e$ (CC20) and $e^+ e^- \to u \bar d s \bar c$ (CC11) are computed. We compare the exact calculation with a ``naive''approach to strong radiative corrections which has been widely used in the literature and discuss the phenomenological relevance of QCD corrections for NLC physics.

hep-ph↗
arXiv1996

$b \bar b W^+ W^-$ production at hadron colliders. Top signal and irreducible backgrounds

We compute complete tree level matrix elements for $gg , q \bar q \rightarrow b \bar b W^+W^-$. We analyze the irreducible backgrounds to top signal at the Tevatron and at the LHC. Their contribution to the total cross section is about $5 \%$ at the LHC, due to single resonant channels. Several distributions with contributions from signal and backgrounds are presented.

hep-ph↗
arXiv1995

NLO QCD corrections to the production of off--shell WW pairs at $e^+ e^-$ colliders

QCD corrections to $e^+e^- \ra WW \ra q_1 \bar q_1 q_2 \bar q_2$ are computed and presented in a form which allows to impose realistic cuts on the structure of the observed events. QCD radiation substantially modifies the jet--jet invariant mass distributions from which the value of the $W$ mass will be extracted. When the range of allowed jet--jet masses is restricted, as it has been proposed in order to suppress non--$WW$ backgrounds, the total cross section is also deeply affected. If all events are forced to four jets, combining the two partons with smallest invariant mass, and the reconstructed masses are required to satisfy $ \left| M_{Ri} -M_W \right| \le 10$ GeV $i$=1,2 the lowest order cross section can be reduced by more than 40\%.

hep-ph↗