Measurement of the $\tau$-lepton lifetime at Belle

Belous, K.; Shapkin, M.; Sokolov, A.; Adachi, I.; Aihara, H.; Asner, D.M.; Aulchenko, V.; Bakich, A.M.; Bala, A.; Bhuyan, B.

doi:10.1103/PhysRevLett.112.031801

Measurement of the $\tau$ -lepton lifetime at Belle

Belle

Collaboration

Oct 31, 2013

6 pages

Published in:

Phys.Rev.Lett. 112 (2014) 3, 031801

Published: Jan 23, 2014

e-Print:

1310.8503 [hep-ex]

DOI:

10.1103/PhysRevLett.112.031801

PDG:

{{\mathit \tau}}

MEAN LIFE

Experiments:

KEK-BF-BELLE

View in:

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reference search59 citations

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Abstract: (APS)

The lifetime of the

τ

lepton is measured using the process

e^{+} e^{-} \to τ^{+} τ^{-}

, where both

τ

leptons decay to

3 π ν_{τ}

. The result for the mean lifetime, based on

711 {fb}^{- 1}

of data collected with the Belle detector at the

ϒ (4 S)

resonance and

60 MeV

below, is

τ = (290.17 \pm 0.53 (stat) \pm 0.33 (syst)) \times 10^{- 15} s

. The first measurement of the lifetime difference between

τ^{+}

and

τ^{-}

is performed. The upper limit on the relative lifetime difference between positive and negative

τ

leptons is

| Δ τ | / τ < 7.0 \times 10^{- 3}

at 90% C.L.

Note:

17 pages, 4 figures. Submitted to Phys. Rev. Lett

13.66.Jn
14.60.Fg
lifetime: difference
BELLE
electron positron: annihilation
tau: pair production
lifetime
tau: semileptonic decay
experimental results
KEK-B

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Measurement of the τ\tauτ-lepton lifetime at Belle

Citations per year

Measurement of the $\tau$ -lepton lifetime at Belle