Dear Colleagues, We posted the first version of CDF note 7307, Title ----- "Search for the WH Production Using High-pT Isolated Like-Sign Dilepton Events in Run II" Abstract -------- We search for the neutral higgs production associated with the W boson using high-pT isolated like-sign dilepton events in the CDF Run-II data corresponding to an integrated luminosity of 193.5 /pb. We first study the background components in our base-line like-sign sample which is created by requiring the leading lepton pT > 20 GeV/c and the second lepton pT > 6 GeV/c, and confirm that, overall, the entire sample is consistent with our background expectation. Based on the S/sqrt(B) calculation using signal Monte Carlo's and our background expectation, the signal region is then determined in the plane of the second lepton pT (pT2) versus the vector sum of pT's of the two leptons (pT12). The signal region is pT2 > 16 (18) GeV/c and pT12 > 35 GeV/c for the higgs masses < 160 GeV/c2 (>160 GeV/c2). No event is found, while the total background is expected to be 0.95 +- 0.61(stat.) +- 0.18(syst.) events, the 110 GeV/c2 bosophilic (fermiophobic) higgs to be about 0.06 events assuming the same production cross section as the Standard Model higgs, and the 160 GeV/c2 Standard Model higgs to be about 0.03 events. We set cross section upper limits sigma(WH) x Br(H -> WW) < 12 pb at the 95 % C.L. for the 110 GeV/c2 higgs and 8 pb for the 160 GeV/c2 higgs. This analysis is structured from simple techniques only: conventional isolation, high-pT lepton identification, and simple kinematical requirements to define the signal region. There is no signal-specific cuts such as missing-ET and other topological cuts. The present result therefore provides a conservative physics interpretation. Authors ------- Hirokazu Kobayashi ( hirokazu@fnal.gov ) Kazuhiro Yamamoto ( kazuhiro@fnal.gov ) Yoshihiro Seiya ( seiya@fnal.gov ) Posted to /cdf/pub/cdf7307_lsd_public.ps http://www-cdf.fnal.gov/cdfnotes/cdf7307_lsd_public.ps Posted by hirokazu@fcdfwww