Improved $b$-jet Energy Correction for $H \to b\bar{b}$ Searches at CDF
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Abstract
We present a method for improving the b-jet energy resolution in order to improve the signal sensitivity in searches for particles decaying to a b quark and anti-b quark.A correction function is computed for individual jets, which combines information from the secondary vertex tagger, the offline tracking and standard calorimeter-based jet-energy reconstruction algorithm in order to provide a more accurate measurement of the true b-quark energy.We apply the correction to Monte-Carlo-simulated jets in the process W H b b and find an improvement in both the mean and the resolution of the b-jet energy with respect to the b-quark energy.The correction improves the measured Higgs dijet invariant mass resolution from 15%(standard jet corrections) to 11%(improved jet corrections) in the Higgs mass range from 100 GeV/c 2 -150 GeV/c 2 .Using the corrected b-jet energies instead of the standard calorimeter-based b-jet energies results in a 9% improvement in the expected sensitivity for Higgs boson production cross section in the most sensitive search region of the W H b b analysis, which is two tagged jets and one charged central lepton.