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First look into sbottom and gluino reconstruction. Massimiliano Chiorboli University and INFN Catania. m (GeV). m (GeV). 299.2. 273.4. 275.0. 94.5. 309.3. 95.0. > 300. 44.5. SUGRA parameters. p. b. b. p. Decay chain and event topology. Event final state:

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first look into sbottom and gluino reconstruction

First look into sbottom and gluino reconstruction

Massimiliano Chiorboli

University and INFN Catania

sugra parameters

m (GeV)

m (GeV)

299.2

273.4

275.0

94.5

309.3

95.0

> 300

44.5

SUGRA parameters

Massimiliano Chiorboli

decay chain and event topology

p

b

b

p

Decay chainand event topology
  • Event final state:
  • 2 high pt isolated leptons OS
  • 2 high pt b jets
  • missing Et

Massimiliano Chiorboli

events production

Signal

SUSY bkg

1’088’000

65’000

2’005’000

72’000

531’000

SM bkg

28’000

1’860’000

51’000

Events production
  • SPYTHIA (PYTHIA 6.136)
  • CMSJET 4.703

3 fb-1

Massimiliano Chiorboli

events selection
Events selection

Events

%

  • at least 2 isolated leptons with pt>15 GeV and |h|<2.4
  • at least 2 b-jets with pt>15 GeV and |h|<2

27’228

1.4

54’216

5.0

3’765

0.7

48

<0.1

165

0.6

10

10-4

400

0.5

1’302

<10-4

Massimiliano Chiorboli

slide6

Reconstruction of

is forbidden

SUSY

  • invariant mass of e+e- and m+m-
  • due to kinematics, the distribution shows an edge

Massimiliano Chiorboli

slide7

Reconstruction of

85929

SUSY

Subtracting invariant mass of OSOF pairs eliminate SM and combinatorial bkg

Massimiliano Chiorboli

estimation
estimation

Massimiliano Chiorboli

sbottom reconstruction

signal

bkg

Sbottom reconstruction

Massimiliano Chiorboli

sbottom reconstruction ii
Sbottom reconstruction (II)

reconstructed neutralino combined with the most energetic b-jet, assuming Mc1known

Massimiliano Chiorboli

sbottom reconstruction iii
Sbottom reconstruction (III)

Assuming M(c10) = 44.5 GeV

At the moment,

no jet energy correction

Massimiliano Chiorboli

gluino reconstruction
Gluino reconstruction
  • combination of the reconstructed sbottom and a b-jet
  • ~ 10 % of the selected events have >2 b-jets

the b-jet closest to the reconstructed sbottom is chosen

Massimiliano Chiorboli

gluino reconstruction ii
Gluino reconstruction (II)

Massimiliano Chiorboli

gluino reconstruction iii
Gluino reconstruction (III)

Massimiliano Chiorboli

gluino reconstruction iv
Gluino reconstruction (IV)
  • Cut on this angle to select the b-jet coming from the gluino

Massimiliano Chiorboli

gluino reconstruction v
Gluino reconstruction (V)

Massimiliano Chiorboli

evaluation
evaluation

Massimiliano Chiorboli

evaluation ii
evaluation (II)

Massimiliano Chiorboli

dependence from
Dependence from

c10 mass assumed to be known

Massimiliano Chiorboli

results within 3 fb 1
Results within 3 fb-1

Massimiliano Chiorboli

future plans
Future plans
  • Scanning the mSUGRA parameters plane
  • Including the jet energy correction
  • Improving the cuts
  • Studying this decay chain as a benchmark channel for the b-tagging

Massimiliano Chiorboli

gluino reconstruction1
Gluino reconstruction

Massimiliano Chiorboli

slide24

Sbottom reconstruction

Assuming M(c10) = 44.5 GeV

At the moment,

no jet energy correction

Massimiliano Chiorboli