# Measurement of the W mass by direct reconstruction in $e^+ e^-$ collisions at 172 GeV

Abstract : The mass of the W boson is obtained from reconstructed invariant mass distributions in W-pair events. The sample of W pairs is selected from 10.65~pb$^{-1}$ collected with the ALEPH detector at a mean centre-of-mass energy of 172.09 \GEV. The invariant mass distribution of simulated events are fitted to the experimental distributions and the following W masses are obtained: $WW \to q\overline{q}q\overline{q } m_W = 81.30 +- 0.47(stat.) +- 0.11(syst.) GeV/c^2$, $WW \to l\nu q\overline{q}(l=e,\mu) m_W = 80.54 +- 0.47(stat.) +- 0.11(syst.) GeV/c^2$, $WW \to \tau\nu q\overline{q} m_W = 79.56 +- 1.08(stat.) +- 0.23(syst.) GeV/C62$. The statistical errors are the expected errors for Monte Carlo samples of the same integrated luminosity as the data. The combination of these measurements gives: $m_W = 80.80 +- 0.11(syst.) +- 0.03(LEP energy) GeV/^2$.
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Journal articles

Cited literature [15 references]

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Submitted on : Thursday, January 7, 1999 - 11:25:08 AM
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### Identifiers

• HAL Id : in2p3-00011557, version 1

### Citation

R. Barate, S. Jezequel, D. Buskulic, D. Decamp, P. Ghez, et al.. Measurement of the W mass by direct reconstruction in $e^+ e^-$ collisions at 172 GeV. Physics Letters B, Elsevier, 1998, 422, pp.384. ⟨in2p3-00011557⟩

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