Journal
PHYSICAL REVIEW LETTERS
Volume 118, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.211801
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Funding
- MEXT (Japan)
- JSPS (Japan)
- Nagoya's TLPRC (Japan)
- ARC (Australia)
- FWF (Austria)
- NSFC (China)
- CCEPP (China)
- MSMT (Czechia)
- CZF (Germany)
- DFG (Germany)
- VS (Germany)
- EXC153 (Germany)
- DST (India)
- INFN (Italy)
- MOE of KISTI (Korea)
- MSIP of KISTI (Korea)
- NRF of KISTI (Korea)
- BK21Plus of KISTI (Korea)
- WCU of KISTI (Korea)
- RSRI of KISTI (Korea)
- FLRFAS project of KISTI (Korea)
- GSDC of KISTI (Korea)
- MNiSW (Poland)
- NCN (Poland)
- MES (Russia)
- RFAAE (Russia)
- ARRS (Slovenia)
- IKERBASQUE (Spain)
- UPV/EHU (Spain)
- SNSF (Switzerland)
- MOE (Taiwan)
- MOST (Taiwan)
- DOE (USA)
- NSF (USA)
- [26220706]
- [25.3096]
- Grants-in-Aid for Scientific Research [26220706] Funding Source: KAKEN
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We report the first measurement of the tau lepton polarization P-tau(D*) in the decay (B) over bar -> D* tau(-) (v) over bar (tau) as well as a newmeasurement of the ratio of the branching fractions R(D*) = B((B) over bar -> D* tau(-) (v) over bar (tau)) / B((B) over bar -> D* l(-) (v) over bar (l)), where l(-) denotes an electron or a muon, and the tau is reconstructed in the modes tau(-) -> pi(-) v(tau) and tau(-) -> rho(-) v(tau). We use the full data sample of 772 x 10(6) B (B) over bar pairs recorded with the Belle detector at the (KEKB) over bar electron-positron collider. Our results, P-tau(D*) = -0.38 +/- 0.51 (stat)(-0.16)(+0.21) (syst) and R(D*) = 0.270 +/- 0.035 (stat)(- 0.025)(+0.028) (syst), are consistent with the theoretical predictions of the standard model.
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