Flavour Tagging Requirements
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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

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Flavour Tagging Requirements M Battaglia

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Flavour tagging requirements m battaglia

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

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


Flavour tagging requirements m battaglia

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


Flavour tagging requirements m battaglia

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


Flavour tagging requirements m battaglia

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-)


Flavour tagging requirements m battaglia

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


Flavour tagging requirements m battaglia

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


Flavour tagging requirements m battaglia

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


Flavour tagging requirements m battaglia

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.


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