Study of charged current $e p$ interactions at $Q^{2}$ > $200-Gev^{2}$ with the ZEUS detector at HERA
1996
Deep inelastic charged-current reactions have been studied ine
+
p ande
−
p collisions at a center of mass energy of about 300GeV in the kinematic regionQ
2>200GeV2 andx>0.006 using the ZEUS detector at HERA. The integrated cross sections forQ
2>200GeV2 are found to be
$$\sigma _{e^ + p \to \bar \nu X} = 30.3_{ - 4.2 - 2.6}^{ + 5.5 + 1.6} pb$$
and
$$\sigma _{e^ - p \to \nu X} = 54.7_{ - 9.8 - 3.4}^{ + 15.9 + 2.8} pb$$
. Differential cross sections have been measured as functions of the variablesx, y andQ
2. From the measured differential cross sectionsdσ/dQ
2, theW boson mass is determined to be
$$M_W = 79_{ - 7 - 4}^{ + 8 + 4} GeV$$
. Measured jet rates and transverse energy profiles agree with model predictions. A search for charged-current interactions with a large rapidity gap yielded one candidate event, corresponding to a cross section of
$$\sigma _{e^ + p \to \bar \nu X} (Q^2 > 200 GeV^2 ; \eta _{\max }< 2.5) = 0.8_{ - 0.7}^{ + 1.8} \pm 0.1 pb$$
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