1 / 9

Flavour Tagging Requirements M Battaglia

Flavour Tagging Requirements M Battaglia. Kinematics and Topology. Broad range of b-jet energies of interest: ~0.1 g 1.5 TeV; Long lived hadrons in b-jets acquire significant flight distance: in four jet 3 TeV events over 1/3 of charged particles

chessa
Download Presentation

Flavour Tagging Requirements M Battaglia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Flavour Tagging Requirements M Battaglia

  2. Kinematics and Topology Broad range of b-jet energies of interest: ~0.1 g 1.5 TeV; Long lived hadrons in b-jets acquire significant flight distance: in four jet 3 TeV events over 1/3 of charged particles with p>1 GeV decay after first VTX layer e+e-gnnH0 (180)gnnbb b-jet Energy e+e-g H0A0g bbbb b-jet Energy e+e-g H0A0g bbbb Radius of Vertex of Origin

  3. Impact Parameter Resolution Five-layered barrel VTX with Rin = 30 mm, Rout = 60 mm 15 mm pixels, 3 mm single point resolution, MOKKA+ dedicated Marlin digi and standalone patrec e+e-g H0A0gbbbb 3 TeV

  4. b-tag in Multi-parton Processes: e+e- g H0A0g bbbb • SUSY heavy Higgs boson expected to be a genuine feast for flavour tagging • e+e-g H0A0g bbbb, g bbtt, gtttt; • e+e-g H+H-g tbtb, gtntn. • Production central but cross sections only O(1 fb) and e = etag4 Full MOKKA+Marlin w/ Full SM Bkg + 20 BX gg

  5. b-tag in Missing Energy Processes: e+e-gnnH0gnnbb Determine intermediate-mass Higgs fermionic coupling gHbb H g bb as “Rare Higgs Decay” s(e+e-)

  6. b-tag in Missing Energy Processes: e+e-gnnH0gnnbb Preliminary MOKKA+Marlin H(180)nn signal + simulation level SM background; Assume eb = 0.90 dBR(Hgbb)/BR(Hgbb) = 0.045 MH = 180 GeV

  7. b-tag in Missing Energy Processes: e+e-gnnH0H0gnnbbbb Unique opportunity to precisely probe Higgs potential through gHHH Experimental “tour de force” : xSec ~ 1 fb; soft, fwd b-jets and ZZnn, WWnn, tt backgrounds

  8. Sensitivity of HHnn cross section to triple Higgs coupling for various polar angle coverages Non-trivial interference of double WW fusion with other diagrams yielding double Higgs production but not involving the triple Higgs vertex; All angles • Imperative to accept (b-tag ?) • jets at low angles to retain the • sensitivity to gHHH; • = eb4 with ~ 1.5-2.0k useful • evts g need to achieve eb > 0.85 |cos q | < 0.95 |cos q | < 0.85

  9. b-tag in 2-fermion Processes: e+e-g bb Sensitivity to Z’SSM from s(e+e-g bb) for various polar angle coverages Electroweak observables open up window on high mass scale beyond kinematic reach and enable us to identify nature of new bosons; Cross sections, AFB and ALR main observables for tagged fermions; No significant loss of sensitivity discarding small angles but needs high tagging efficiency and purity and potentially vertex charge for AFB.

More Related