| dc.creator |
Jamin, Matthias |
|
| dc.creator |
Pich, Antonio |
|
| dc.creator |
Portolés, Jorge |
|
| dc.date |
2008-04-17T22:32:00Z |
|
| dc.date |
2008-04-17T22:32:00Z |
|
| dc.date |
2008-06-12 |
|
| dc.date.accessioned |
2017-01-31T01:02:28Z |
|
| dc.date.available |
2017-01-31T01:02:28Z |
|
| dc.identifier |
Physics Letters B 664(1-2): 78-83 (2008) |
|
| dc.identifier |
http://hdl.handle.net/10261/3636 |
|
| dc.identifier |
10.1016/j.physletb.2008.04.049 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3636 |
|
| dc.description |
15 páginas, 2 figuras, 3 tablas.-- arXiv:0803.1786v1 |
|
| dc.description |
A theoretical description of the differential decay spectrum for the decay tau- -> nu_tau K_S pi-, which is based on the contributing K pi vector and scalar form factors F_+^{K pi}(s) and F_0^{K pi}(s) being calculated in the framework of resonance chiral theory (R$\chi$T), additionally imposing constraints from dispersion relations as well as short distance QCD, provides a good representation of a recent measurement of the spectrum by the Belle collaboration. Our fit allows to deduce the total branching fraction B[tau- -> nu_tau K_S pi-] = 0.427 ± 0.024 % by integrating the spectrum, as well as the K^* resonance parameters M_{K^*} = 895.3 ± 0.2 MeV and Gamma_{K^*} = 47.5 ± 0.4 MeV, where the last two errors are statistical only. From our fits, we confirm that the scalar form factor F_0^{K pi}(s) is required to provide a good description, but we were unable to further constrain this contribution. Finally, from our results for the vector form factor F_+^{K pi}(s), we update the corresponding slope and curvature parameters lambda'_+ = (25.2 ± 0.3)*10^{-3} and lambda''_+ = (12.9 ± 0.3)*10^{-4}, respectively. |
|
| dc.description |
This work has been supported in part by EU Contract No. MRTN-CT-2006-035482 (FLAVIAnet) (MJ, AP, JP), by CICYTFEDER-
FPA2005-02211 (MJ), by MEC (Spain) grant No. FPA2007-60323 (AP, JP) and by Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042). |
|
| dc.description |
Peer reviewed |
|
| dc.format |
224430 bytes |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.publisher |
Elsevier |
|
| dc.relation |
Preprint |
|
| dc.relation |
http://dx.doi.org/10.1016/j.physletb.2008.04.049 |
|
| dc.rights |
openAccess |
|
| dc.subject |
Decays of taus |
|
| dc.subject |
Chiral symmetries |
|
| dc.subject |
Dispersion relations |
|
| dc.title |
What can be learned from the Belle spectrum for the decay - tau- ---> nu(tau) K(S) pi- |
|
| dc.type |
Pre-print |
|