Ikado, K;
Abe, K;
Abe, K;
Adachi, I;
Aihara, H;
Akai, K;
Akemoto, M;
... Belle Collaborat; + view all
(2006)
Evidence of the purely leptonic decay B- -> tau(-)(v)over-bar(tau).
PHYS REV LETT
, 97
(25)
, Article 251802. 10.1103/PhysRevLett.97.251802.
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Abstract
We present the first evidence of the decay B-->tau(-)nu(tau), using 414 fb(-1) of data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics and measure the branching fraction to be B(B-->tau(-)nu(tau))=(1.79(-0.49)(+0.56)(stat)(-0.51)(+0.46)(syst))x10(-4). This implies that f(B)=0.229(-0.031)(+0.036)(stat)(-0.037)(+0.034)(syst) GeV and is the first direct measurement of this quantity.
| Type: | Article |
|---|---|
| Title: | Evidence of the purely leptonic decay B- -> tau(-)(v)over-bar(tau) |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.97.251802 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.97.251802 |
| Language: | English |
| Additional information: | © 2006 The American Physical Society |
| Keywords: | DETECTOR, PHYSICS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1308528 |
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