# Differences

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+ | ====== TTP06-01 Tau-Decays to Five Mesons in TAUOLA ====== | ||

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+ | <hidden TTP06-01 Tau-Decays to Five Mesons in TAUOLA > The $\tau$-decay library TAUOLA has gained popularity over the last decade. | ||

+ | However, with the continuously increasing precision of the data, some of its | ||

+ | functionality has become insufficient. | ||

+ | One of the requirements is the implementation of decays | ||

+ | into five mesons plus a neutrino with a realistic decay amplitude. This note | ||

+ | describes a step into this direction. | ||

+ | For the $2\pi^-\pi^+2\pi^0$ mode the three decay chains | ||

+ | $\tau^- \to a_1^- \nu \to | ||

+ | \rho^-(\to \pi^-\pi^0) \omega (\to \pi^-\pi^+\pi^0) \nu$, | ||

+ | $\tau^- \to a_1^- \nu \to | ||

+ | a_1^-(\to 2\pi^-\pi^+) f_0 (\to 2\pi^0) \nu$, and | ||

+ | $\tau^- \to a_1^- \nu \to | ||

+ | a_1^-(\to \pi^-2\pi^0) f_0 (\to \pi^+\pi-) \nu$ are introduced | ||

+ | with simple assumptions about the couplings and propagators of the | ||

+ | various resonances. Similar amplitudes (without the | ||

+ | $\rho\omega$ contributions) are adopted for the $\pi^-4\pi^0$ | ||

+ | and $3\pi^-2\pi^+$ modes. | ||

+ | | ||

+ | The five-pion amplitude is thus based on a simple model, | ||

+ | which, however, can be considered as a first realistic example. | ||

+ | Phase-space generation includes the possibility of | ||

+ | presampling the $\omega$ and $a_1$ resonances, in one channel only, however. | ||

+ | This is probably sufficient for the time being, both for physics applications | ||

+ | and for tests. | ||

+ | | ||

+ | The technical test of the new part of the generator | ||

+ | is performed by comparing Monte Carlo and analytical results. | ||

+ | To this end a non-realistic, but easy to calculate, | ||

+ | purely scalar amplitude for the decay into five massless pions was used. | ||

+ | </hidden> | ||

+ | |**Johann H. Kuehn and Z. Was** | | ||

+ | |** Acta Phys.Polon. B39 147-158 2008 ** | | ||

+ | | {{preprints:2006:ttp06-01.pdf|PDF}} {{preprints:2006:ttp06-01.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/0602162|arXiv]] | | ||

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