Searching the inclusive l gamma EslashT+b-quark signature for radiative top quark decay and non-standard-model processes
We compare the inclusive production of events containing a lepton (ℓ), a photon (γ), significant transverse momentum imbalance (E̸[subscript T]), and a jet identified as containing a b-quark, to SM predictions. The search uses data produced in proton-antiproton collisions at √s=1.96 TeV correspondi...
| Main Authors: | , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
American Physical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/51864 https://orcid.org/0000-0002-6047-4211 |
| Summary: | We compare the inclusive production of events containing a lepton (ℓ), a photon (γ), significant transverse momentum imbalance (E̸[subscript T]), and a jet identified as containing a b-quark, to SM predictions. The search uses data produced in proton-antiproton collisions at √s=1.96 TeV corresponding to 1.9 fb[superscript -1] of integrated luminosity taken with the CDF detector. We find 28 ℓγb(E̸[subscript T]) events versus an expectation of 31.0[subscript -3.5][superscript +4.1] events. If we further require events to contain at least three jets and large total transverse energy, the largest SM source is radiative top-quark pair production, tt̅ +γ. In the data we observe 16 tt̅ γ candidate events versus an expectation from SM sources of 11.2-2.1+2.3. Assuming the difference between the observed number and the predicted non-top-quark total of 6.8[subscript -2.0][superscript +2.2] is due to SM top-quark production, we estimate the tt̅ γ cross section to be 0.15±0.08 pb. |
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