SAMURAI-apps · Precision study of W bosons pair production in association with jets at High Energy Colliders
FP7 — People (Marie Curie Actions)
- Duration
- 2011-10-01 → 2012-09-30
- EU contribution
- €121,353
- Participants
- 1
- Scheme
- MC-IEF
Lines connect the coordinator with its partners.
Results in brief
Precision study of W bosons pair production in association with jets at High Energy Colliders
The researcher's activity at CERN has been devoted to the computation of precise predictions for event distributions at the Large Hadron Collider. The recent discovery of a new resonance at the LHC at CERN of mass 125 GeV is the result of the efforts in the construction and operation of the accelerator and of the detectors as well as of the efficiency in the implementation and interpretation of very detailed analyzes on the large amount of informations collected. Now the aim is to have detailed measurements of all the decay branching ratios of the novel particle while of course search for other new particles in all the mass regions accessible. The first question is to establish if the new resonance is or not the Higgs boson. In this scenario it is clear that the help of automated tools for the simulation of signals and backgrounds coming from the Standard Model or beyond is desirable and is now possible including Quantum Chromo Dynamic (QCD) corrections up to the NLO accuracy in the perturbative strong coupling constant. The QCD corrections at Hadron Colliders play of course the main role and several fully automated tools exist based on the leading order prediction in perturbation theory for the hard scattering processes. The Next to Leading Order (NLO) hard QCD corrections, being in general quite sizable, are also needed to get predictions with a theoretical error comparable with the accuracy attainable at the LHC.
Data: CORDIS, © European Union
Project objective
With the beginning of the experimental programs at the LHC, the need to describe multi-particle scattering events with high accuracy has become more pressing. On the theoretical side, perturbative calculation within leading order precision cannot be sufficient, therefore accounting for effects due to Next-to-Leading Order (NLO) corrections becomes mandatory.In the last few years, tremendous progress in the computation of one-loop virtual corrections for processes involving many particles has been observed. The new ideas based on the universal four-dimensional decomposition for the numerator of the integrand for any one-loop scattering amplitudes, the four-dimensional unitarity-cuts, detecting only the (poly)logarithmic structure of the amplitude, known as the cut-constructible part, and unitarity-cuts in $d$-dimension, yielding the complete determination of dimensionally regulated one-loop amplitudes, appear to give the possibility of developing an automated multi-process evaluator for scattering amplitudes at NLO. In this context, the researcher and his collaborators merged many of the new ideas to develop a new formalism encoded in a public computer program called SAMURAI. SAMURAI is a tool designed for the automated numerical evaluation of one-loop corrections to any scattering amplitudes within the dimensional-regularization scheme.The potential of SAMURAI will be exploited into all possible high energy physics applications.
Original text from CORDIS.
Participants
- ORGANISATION EUROPEENNE POUR LA RECHERCHE NUCLEAIRE · GENEVE 23CoordinatorSwitzerland
Links
Data: CORDIS, © European Union