| dc.creator |
Gámiz, Elvira |
|
| dc.creator |
Jamin, Matthias |
|
| dc.creator |
Pich, Antonio |
|
| dc.creator |
Prades, Joaquim |
|
| dc.creator |
Schwab, Felix |
|
| dc.date |
2008-04-17T23:18:05Z |
|
| dc.date |
2008-04-17T23:18:05Z |
|
| dc.date |
2007 |
|
| dc.date.accessioned |
2017-01-31T01:02:29Z |
|
| dc.date.available |
2017-01-31T01:02:29Z |
|
| dc.identifier |
PoS - Proceedings of Science (KAON) 008 (2007) |
|
| dc.identifier |
1824-8039 |
|
| dc.identifier |
http://hdl.handle.net/10261/3639 |
|
| dc.identifier.uri |
http://dspace.mediu.edu.my:8181/xmlui/handle/10261/3639 |
|
| dc.description |
9 páginas.-- Comunicación presentada a la Kaon International Conference (KAON'07) celebrada del 21 al 25 de MAyo de 2007 en Frascati (Italia). |
|
| dc.description |
A very precise determination of V_us can be obtained from the semi-inclusive hadronic decay width of the tau lepton into final states with strangeness. The ratio of the Cabibbo-suppressed and Cabibbo-allowed tau decay widths directly measures (V_us/V_ud)^2, up to very small SU(3)-breaking corrections which can be theoretically estimated with the needed accuracy. Together with previous LEP and CLEO data, the recent measurements by Babar and Belle of some Cabibbo-suppressed tau decays imply V_us= 0.2165 +- 0.0026_exp +- 0.0005_th, which is already competitive with the standard extraction from K_l3 decays. The uncertainty is largely dominated by experimental errors and should be easily reduced with the high statistics of the B factories, providing the most accurate determination of this parameter. A 1% experimental precision on the Cabibbo-suppressed tau decay width would translate into a 0.6% uncertainty on V_us. |
|
| dc.description |
This work has been supported by the European Commission MRTN FLAVIAnet [MRTN-CT-
2006-035482], theMEC (Spain) and FEDER (EC) [FPA2005-02211 (M.J.), FPA2004-00996 (A.P.)
and FPA2006-05294 (J.P.)], the Deutsche Forschungsgemeinschaft (F.S.), the Junta de Andalucía [P05-FQM-101 (J.P.), P05-FQM-437 (E.G. and J.P.) and Sabbatical Grant PR2006-0369 (J.P.)] and the Generalitat Valenciana [GVACOMP2007-156 (A.P.)]. |
|
| dc.description |
Peer reviewed |
|
| dc.format |
113258 bytes |
|
| dc.format |
application/pdf |
|
| dc.language |
eng |
|
| dc.publisher |
International School for Advanced Studies |
|
| dc.relation |
http://pos.sissa.it/cgi-bin/reader/conf.cgi?confid=46 |
|
| dc.rights |
openAccess |
|
| dc.title |
Theoretical progress on the V_us determination from tau decays |
|
| dc.type |
Comunicación de congreso |
|