Search for h→ at Dzero

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Search for h→ at Dzero 刘衍文中国科大中国高能物理学会第十届全国粒子物理学术会议南京, 2008年4月27日

Outline Tevatron Higgs search status Dzero detector Higgs→ at Dzero Photon identification Preliminary results Outlook

Tevatron √s = 1.96TeV 36x36,396ns bunch crossing Record lumi:

Luminosity projection R. Dixon Feb 2008, P5

Getting close …

Status of Higgs searches Dec 14,2007 , channels added Apr 21,2008 arXiv:0804.3423 arXiv:0712.2383

The Dzero detector 2T, R=0.7m L=2.7m Silicon microstrip (SMT) , central fiber tracker(CFT) Sampling calorimeter, preshower(CPS), finer granularity at 3rd layer of EM, muon system

Fermiophobic higgs in  Higgs that have zero coupling to fermions, and all decay to boson pairs. Fermiophobic higgs in  Fermiophobic scenario arXiv:0803.1514v1[hep-ex] RunIIa data Higgs decay in SM

Photon identification ET > 25 GeV 97% energy in ECAL Isolated in ECAL No track Use of CPS “EM-pointing” for selecting the right vertex “hit-on-road” to reduce electrons HOR efficiency for photons Needs to be commissioned for Run2B. Work in progress. Very preliminary

Artificial Neural Network(ANN) ANN: Combines a few variables for discrimination power . Select input variables that are insensitive to the e/ difference – ANN trained with photons can be cross-checked with electrons

Input variables

The output

Background contributions PRL95,022003(2005) CDF II, 200/pb PYTHIA/RESBOS/DIPHOX: similar shapes at high M QCD  PYTHIA simulation, DIPHOX (NLO for normalization, 20% uncertainty). j,jj from data (next slides) e+e- PYTHIA, NNLO cross section for normalization

Background estimation (inclusive)

Background subtraction () Use ONN>0.85 for the classification

Preliminary result out of 2.3/fb Conference note (public) available at http://www-d0.fnal.gov/Run2Physics/WWW/results/prelim/HIGGS/H48/ Preliminary result out of 2.3/fb Dominant uncertainties: DIPHOX cross section :20%, j,jj estimation: 26%.

Current limits for   Contribute to the Tevatron combination. Very first look, large room for improvements.

Plan: instead of conclusion Determine  from data at side bands Reduce uncertainties in photon ANN ID Commission photon ID techniques ,e.g., CPS for high luminosity. Make an impact at low mass! An important discovery opportunity! 谢谢大家!