ISOLATED LEPTONS AND

MISSING TRANSVERSE MOMENTUM

Contacts: James Ferrando (ZEUS), David South (H1)

Production of isolated leptons associated with missing transverse momentum has a very low cross section in the SM, dominated by real W boson production with subsequent leptonic decay. A deviation to the SM could sign an anomalous top quark FCNC coupling to EW bosons or the decay of new particles like SUSY charginos.

H1 + ZEUS combined results:

Events with an Isolated Lepton and Missing Transverse Momentum and Measurement of W Production at HERA Published in JHEP 1003 (2010) 035 (1) Distribution of lepton polar angle
Distribution of lepton polar angle
(2) Distribution of the difference in the azimuthal angle of the lepton and the hadronic system
Distribution of the difference in the azimuthal angle of the lepton and the hadronic system
(3) Transverse Mass
Transverse Mass
(4) Hadronic transverse momentum
Hadronic transverse momentum
(5) Missing transverse momentum
Missing transverse momentum
(6) Lepton transverse momentum
Lepton transverse momentum
(7) Hadronic transverse momentum for e+p data
Hadronic transverse momentum for e+p data
(8) Hadronic transverse momentum for e-p data
Hadronic transverse momentum for e-p data
(9) Single W production cross section as a function of P_T of the hadronic system
Single W production cross section as a function of P_T of the hadronic system