Detailed analysis of the decay spectrum of a super-heavy X particle

Details Detailed analysis of the decay spectrum of a super-heavy X particle Detailed analysis of the decay spectrum of a super-heavy X particle

2002-11-26

arxiv.org/abs/hep-ph/0211406v2

Astropart.Phys. 20 (2003) 5-44

Physics

High Energy Physics

High Energy Physics - Phenomenology

62 pages, 25 figures, new references added, new footnote p.9 on the validity of DGLAP equations in a broken gauge theorie like

Scientific paper

10.1016/S0927-6505(03)00134-8

Decays of superheavy X particles with mass M_X ~ 10^12 - 10^16 GeV have been proposed as origin of the observed ultra high energy cosmic rays (UHECR). We describe in detail the physics involved in the different steps of the decay of such a particle. In particular, we give for the first time the complete set of splitting functions needed to model a parton shower in the minimal supersymmetric extension of the Standard Model (MSSM). We present our results in the form of fragmentation functions of any (s)particle of the MSSM into any final stable particle (proton, photon, electron, three types of neutrino, lightest superparticle LSP) at a virtuality Q = M_X, over a scaled energy range x = 2E/M_X in [10^{-13}, 1]. Extending the coverage to such small fractional energies is necessary since the energy region around 10^18 eV and below could be of considerable interest in testing this kind of model for generating UHECR. We explicitly demonstrate that our treatment conserves energy, and discuss the dependence of the final result on SUSY parameters. We also show that our results are essentially independent of the necessary extrapolation of the input fragmentation functions, which are known only for x >= 0.1, towards small x. Finally, we added a new treatment of the color coherence effects at very small x, using the analytic ``MLLA'' solution. Our computer code will soon be made available.

Affiliated with

Also associated with

No associations

Rating

Detailed analysis of the decay spectrum of a super-heavy X particle does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Detailed analysis of the decay spectrum of a super-heavy X particle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Detailed analysis of the decay spectrum of a super-heavy X particle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-172673