Scholars@Duke publication: Search for new physics in lepton + photon + X events with 305-pb**(-1) of p anti-p collisions at s**(1/2) = 1.96- TeV

Search for new physics in lepton + photon + X events with 305-pb(-1) of p anti-p collisions at s(1/2) = 1.96- TeV

Publication , Journal Article

Abulencia, ; A, ; others,

Published in: Phys. Rev. Lett.

2006

We present results of a search for anomalous production of events containing a charged lepton (either electron or muon) and a photon, both with high transverse momentum, accompanied by additional signatures, X, including missing transverse energy (MET) and additional leptons and photons. We use the same kinematic selection criteria as in a previous CDF search, but with a substantially larger data set, 305 pb-1, a ppbar collision energy of 1.96 TeV, and the upgraded CDF II detector. We find 42 Lepton+Photon+MET events versus a standard model expectation of 37.3 +- 5.4 events. The level of excess observed in Run I, 16 events with an expectation of 7.6 +- 0.7 events (corresponding to a 2.7 sigma effect), is not supported by the new data. In the signature of Multi-Lepton+Photon+X we observe 31 events versus an expectation of 23.0 +- 2.7 events. In this sample we find no events with an extra photon or MET and so find no events like the one ee+gg+MET event observed in Run I.