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A Determination of W Boson Mass and Light Quark Couplings to Z Boson at HERA |
| Reference |
Preliminary results expected for DIS2005, Spring 2005 |
| Figures |
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| Contact |
B. Portheault |
| Abstract |
The $W$ boson mass is determined together with parton density
distributions in combined electroweak and QCD fits using all $e^+p$ and
$e^-p$ scattering data collected by the H1 experiment from 1994 to 2000.
When the fit is performed interpreting the $W$ boson as a propagator
exchanged in the $t$ channel of charged current interactions,
a propagator mass value of
$M_{
m prop}=82.87\pm1.82{
m [exp]}^{+0.30}_{-0.16}{
m [th]}$\,GeV
is obtained.
Assuming the validity of the Standard Model, the fit leads to a more
precise determination of
$M_W=80.701\pm 0.205{
m [exp]}^{+0.063}_{-0.098}{
m [th]}$\,GeV.
The neutral current data at high $Q^2$, the negative four-momentum transfer
squared, have also been exploited to obtain a first determination of
the weak couplings of the light quarks to the $Z$ boson at HERA. |
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