H y p a t i a hy brid p upil s a nalysis t ool for i nteractions in a tlas
Download
1 / 38

H Y P A T I A HY brid P upil’s A nalysis T ool for I nteractions in A tlas - PowerPoint PPT Presentation


  • 77 Views
  • Uploaded on

H Y P A T I A HY brid P upil’s A nalysis T ool for I nteractions in A tlas. http://hypatia.phys.uoa.gr / applet. HYPATIA of Alexandria. First woman mathematician Alexandria, Egypt ( 370-418 A . D . ). Proton – proton Collisions. Beam energy: 3.5, 4 TeV

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' H Y P A T I A HY brid P upil’s A nalysis T ool for I nteractions in A tlas' - tarala


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
H y p a t i a hy brid p upil s a nalysis t ool for i nteractions in a tlas

H Y P A T I AHYbrid Pupil’s Analysis Tool for Interactions in Atlas

http://hypatia.phys.uoa.gr/applet


Hypatia of alexandria

HYPATIA of Alexandria

First woman mathematician

Alexandria, Egypt(370-418 A.D.)


Proton proton collisions
Proton – proton Collisions

  • Beam energy: 3.5, 4 TeV

  • 2 x 3.5 TeV = 7 or 8 TeV

  • Some of the particles produced are unstable and decay instantly


Atlas

ATLAS

Particletracksappear as lines on the detectors

Thelengthof each track is determined by particle type

Each particle leaves a traceonly on specific detectors according to its type


Hy p a t i a

HY.P.A.T.I.A.

Canvas

Displays events in various forms depending on particle type and user preference.

Can do zoom, pan, rotate, pick tracketc


Hy p a t i a1

HY.P.A.T.I.A.

Track Momenta

Displays the quantities that describe each track (type, momentum, charge, φ, θ)

Histograms

Created automatically from the tracks of the invariant mass table


Hy p a t i a2

HY.P.A.T.I.A.

Η → 4ℓ

Invariant Mass

Main event analysis window.

Displays the user selected tracks from various events. Calculates invariant masses.

Creates Histograms.



Laboratory exercise1

Laboratory Exercise

Detection and mass calculation of particles – Real Events

Known particles:

Z → μ- + μ+ Z → e- + e+

2 tracks, opposite charge, isolated

Invariant mass 91,2GeV

Small missing energy ETMiss

J/ψ → μ- + μ+ J/ψ → e- + e+

2 tracks, opposite charge, not diametrical

Invariant mass 3GeV

Small missing energyETMiss<15GeV


Laboratory exercise2

Laboratory Exercise

Detection and mass calculation of particles – Real Events

Known particles:

Υ → μ- + μ+ Υ → e- + e+

2 tracks, opposite charge

Invariant mass 9,5 GeV

Small missing energy ETMiss

Background events

Usually one lepton (W boson decay)

Leptons from quark decays are in jets (non-isolated tracks)

Cosmic rays : diametrical tracks on both detector views

Large missing energy ETMiss (because of neutrinos)


Laboratory exercise3

Laboratory Exercise

Identification of electrons - muons

e : charged particles, usually isolated that leave a trace in the E/M calorimeter

μ : charged particles that leave a trace in the muon chambers


Laboratory exercise4

Detection and mass calculation of particles- Histogram

Laboratory Exercise


Laboratory exercise5

Detection and mass calculation of particles

Dimuon spectrum

Laboratory Exercise

+???



Laboratory exercise6

Laboratory Exercise

“Discover Higgs”

H → 2 Z →4l

Z → e- + e+ή Z → μ- + μ+

H  2 e- + 2 e+

H  2 μ-+ 2 μ+

Η  e- + e++ μ- + μ+

Isolated tracks

6 GeVpT Cut

Invariant mass of 4tracks (Z boson pairs)


Laboratory exercise7

Laboratory Exercise

“Discover Higgs”

H → 2 γ

Photons do not carry charge

Photons have 0 mass

Photons leave NO tracks

Photons deposit energy on the E/M Calorimeter

Converted photons

γ  e- e+(Invariant mass ≈ 0)





So what are we looking for
So, what are we looking for??

  • Z → e- + e+or Z → μ- + μ+91,2 GeV

  • Y→ e- + e+orY→ μ- + μ+ 9,5 GeV

  • J/ψ→ e- + e+or J/ψ→ μ- + μ+3,1 GeV

  • Unknown particles→ e- + e+or→ μ- + μ+

  • H → 2 Z →4l (very few events)?GeV

    For all the above enter tracks which have sum of charge=0

  • H → 2 γ? GeV

  • Background


ad