Search for new physics in lepton + photon + $X$ events with 305 $pb^{-1}$ of $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96-TeV

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.

Note:

7 pages, 3 figures, 1 table. Accepted to PRL

13.85.Rm
12.60.Jv
14.80.Ly
13.85.Qk
anti-p p: colliding beams
anti-p p: inclusive reaction
final state: (lepton photon)
final state: (dilepton photon)
transverse momentum: high
transverse energy: missing-energy

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Search for new physics in lepton + photon + XXX events with 305 pb−1pb^{-1}pb−1 of ppˉp \bar{p}ppˉ​ collisions at s\sqrt{s}s​ = 1.96-TeV

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Search for new physics in lepton + photon + $X$ events with 305 $pb^{-1}$ of $p \bar{p}$ collisions at $\sqrt{s}$ = 1.96-TeV