CDF Logo Search for a SM Higgs Boson with the Diphoton Final State at CDF using 7.0fb-1 of Data

 

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Abstract

A search for the SM Higgs boson in the diphoton decay channel is reported using 7.0 fb-1 of data. The previous result used central photons (|&eta|<1.1) collected from standard CDF photon selection. Here, we improve this identification by incorporating a new photon selection that uses a neural network to reject jet backgrounds. Sensitivity is also greatly improved by the addition of forward (1.2<|&eta|<2.8) photons and the development of a new algorithm which selects photons that have converted into an electron-positron pair. No significant excess over the background was observed, so we present 95% C.L. upper limits on the production cross section times H&rarr&gamma&gamma branching fraction relative to the SM expectation. For Higgs masses between 100 and 150 GeV/c2 the expected limits range from 13.0 to 27.2 and observed limits range from 8.2 to 28.2. This is an approximate 33% improvement from the previous result using 5.4 fb-1.

 
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General remarks

The results should be considered preliminary until published in a refereed journal. They can be used in conference presentations with proper reference to the CDF Collaboration.

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  Paged prepared by Karen Bland
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Last updated: 04/18/11