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