(r6) LHCHWGBb < LHCPhysics

LHCPhysics Web>CrossSections>LHCHWGBb (revision 6) (raw view)~~EditAttachPDF~~

---+ H->bbbar Final State Subgroup (LHC HXS WG)
%TOC%

%ICON{"tip"}% *Contribute to Sharepoint discussions here: [[https://espace.cern.ch/lhc-higgs/Lists/WHZH/AllItems.aspx][VH production]], [[https://espace.cern.ch/lhc-higgs/Lists/ttH/AllItems.aspx][ttH production]], [[https://espace.cern.ch/lhc-higgs/Lists/Hbb/AllItems.aspx][bb final state]]*. %ICON{"tip"}%

---++ Group Contacts and Contributors
   * ATLAC/CMS/LHCb Contacts: [[mailto:chris.potter@cern.ch][Chris Potter (Oregon)]]/[[mailto:jolsen@cern.cc][Jim Olsen (Princeton)]]/[[mailto:Clara.Matteuzzi@cern.ch][Clara Matteuzzi (Milano-Bicocca)]]
   * Experiment: Chris Potter, Jim Olsen, Clara Matteuzzi, Chris Neu, Chris Collins-Tooth, Giacinto Piaquadio, Douglas Wright, Michiel Sanders, Ben Smart, Andrea Messina
   * Theory: Laura Reina, Michael Spira

All contributors are welcome!

---++ Meeting Agendae
   * [[http://indico.cern.ch/conferenceDisplay.py?confId=122483][February 2011]]
   * [[http://indico.cern.ch/conferenceDisplay.py?confId=130929][March 2011]]
   * [[http://indico.cern.ch/conferenceDisplay.py?confId=139459][May 2011]]

---++ Plan of Activity
   * VH->Vbb differential K-factor (LO to NLO) in signal and background after common cuts with MC@NLO and POWHEG
   * ttH->ttbb differential K-factor (LO to NLO) in signal with aMC@NLO
   * evaluation of VH->Vbb and ttH->ttbb cross section uncertainties at NLO after common cuts

---++ Common cuts definition between CMS/ATLAS/LHCb

---+++VH->Vbb for LHCb

---+++ Boosted VH->Vbb (PRELIMINARY!)
   * pt(H)>200 !GeV
   * pt(V)>200 !GeV
   * No additional C/A jets with pt > 20 !GeV (|eta|<2.4)

---+++ Non-boosted VH->Vbb (PRELIMINARY proposal from ATLAS, to be discussed with CMS and LHCb)
   * pT(e/mu) > 20-25GeV 
   * |eta(e/mu)| < 2.5
   * 2 jets with pT>25GeV
   * MET > 25GeV (????)

---+++ ttH->ttbb (PRELIMINARY!)
   * exactly one isolated lepton with pt>25 !GeV (20 !GeV) e(mu).
   * >=6 jets with pt>20 !GeV
   * >=4 b-tagged jets with pt>20 !GeV

---+++ Baseline Common Parameters
Preliminary parameters are taken from  [[http://arxiv.org/abs/1101.0538][arXiv:1101.0538]] (PDF, alpha_s, delta alphs_s) and Table A.1 in  [[http://cdsweb.cern.ch/record/1318996/files/cern-2011-002.pdf][CERN-2011-002]].

| *Parameter* | *[[http://arxiv.org/abs/1101.0538][arXiv:1101.0538]] Choice* |
| NLO PDF | CTEQ6.6, MSTW2008, NNPDF2.0 |
| alpha_s | 0.118, 0.1207, 0.119 resp.|
| delta alpha_s | 0.002 90% C.L. |

| *Parameter* | * [[http://cdsweb.cern.ch/record/1318996/files/cern-2011-002.pdf][CERN-2011-002]] Choice* |
| electron mass | 0.510998910(13) MeV |
| muon mass | 105.658367(4) MeV |
| tau mass | 1776.84(17) MeV |
| u quark mass | 190 MeV |
| d quark mass | 190 MeV |
| s quark mass | 190 MeV |
| c quark mass | 1.40 GeV |
| b quark mass | 4.75 GeV |
| t quark mass | 172.5 ± 2.5 GeV |
| MS scheme c mass | 1.28 GeV |
| MS scheme b mass | 4.16 GeV |
| c pole mass 1-loop | 1.41 GeV |
| c pole mass 2-loop | 1.55 GeV |
| b pole mass 1-loop | 4.49 GeV |
| b pole mass 2-loop | 4.69 GeV |
| W mass | 80.398 ± 0.025 GeV |
| W width | 2.141 ± 0.041 GeV |
| NLO W width | 2.08872 GeV |
| Z mass | 91.1876 ± 0.0021 GeV |
| Z width | 2.4952 ± 0.0023 GeV |
| NLO Z width | 2.49595 GeV |
| GF | 1.16637(1) × 10&#8722;5 GeV&#8722;2 |

---++ Available Tools
   * [[https://www.hep.phy.cam.ac.uk/theory/webber/MCatNLO/][MC@NLO]]
   * [[http://powhegbox.mib.infn.it/][POWHEG Box]]
      * [[http://indico.cern.ch/getFile.py/access?resId=0&materialId=slides&confId=136045][The Wbb Process in POWHEG (NLO)]]
   * [[http://amcatnlo.web.cern.ch/amcatnlo/][aMC@NLO]] 
      * [[http://arxiv.org/abs/1104.5613][ttH in aMC@NLO]] (contact the authors at amcatnlo@cern.ch).

---++ Results

---++ References
   * ATLAS Sensitivity to the Standard Model Higgs in the HW and HZ Channels at High Transverse Momenta [[http://cdsweb.cern.ch/record/1201444][ATL-PHYS-PUB-2009-088]]
   * Search for ttH->ttbb [[http://cdsweb.cern.ch/record/1159618?ln=en][CERN-OPEN-2008-020]] (pp. 1333-1363)
   * Search for H->bb in Association with a ttbar Pair at CMS [[http://cdsweb.cern.ch/record/973119?ln=en][CMS-NOTE-2006-119]]
   * PDF4LHC Working Group Interim Recommendations [[http://arxiv.org/abs/1101.0538][arXiv:1101.0538]]
   * Handbook of LHC Higgs Cross Sections: 1. Inclusive Observables [[http://cdsweb.cern.ch/record/1318996/files/cern-2011-002.pdf][CERN-2011-002]]


 


-- Main.ReiTanaka - 02-Oct-2010

Topic revision: r6 - 2011-06-02 - ChristopherPotter

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