Presentation of resultsPresentation of results

March 20th 2013 Masterclass 2013 Masterclass 2013

Padova (ITA) Institute

March 20th 2013

CMS exercise

We did …We did …

March 20th 2013 Masterclass 2013 Masterclass 2013

We have two columns in xls file: electron and muon

Lepton ID with detectors

Charge determination

GOAL is particle ID through leptonic decays

Questions: Which detector did you look?

How did you measure the particle charge?

We did …We did …

March 20th 2013 Masterclass 2013 Masterclass 2013

We have three columns in xls file: +, -, not known

Question: Which quantities are conserved?

We did …We did …

March 20th 2013 Masterclass 2013 Masterclass 2013

We have three columns in xls file: Z, ZZ, mass

Question: Describe the ZZ decays with only charged leptons.

Finally, we have the column called zoo: … …

Question: What is it?

Padova results: numbersPadova results: numbers

March 20th 2013 Masterclass 2013 Masterclass 2013

Padova results: ratiosPadova results: ratios

March 20th 2013 Masterclass 2013 Masterclass 2013

Ratio e/μRatio W+/W-

Expected value [ratio e/μ] = 1.0Expected value [ratio W+/W-] = 1.4

Measure [ratio e/μ] = (1.05 ± 0.06) Measure [ratio W+/W-] = (1.31 ± 0.09)

Question: Why the ratio e/μ is 1.0?

Question: Why is W+ more frequent than W-?

Lione results: mass plotLione results: mass plot

March 20th 2013 Masterclass 2013 Masterclass 2013

Massplot Lione (March 18 th)

Torino results: mass plotTorino results: mass plot

March 20th 2013 Masterclass 2013 Masterclass 2013

Massplot Torino (March 18 th)

Padova results: Z mass plotPadova results: Z mass plot

March 20th 2013 Masterclass 2013 Masterclass 2013

Massplot Padova (March 20 th)

MZZ ≈ 126 GeVHiggs candidates

From Particle Data Group Mass (Z) = (91.1876 ± 0.0021) GeV

Padova results: Z mass plotPadova results: Z mass plot

March 20th 2013 Masterclass 2013 Masterclass 2013

Massplot Padova (March 20 th)

MZZ ≈ 126 GeVHiggs candidates

Padova results: Higgs candidatesPadova results: Higgs candidates

March 20th 2013 Masterclass 2013 Masterclass 2013

Your Higgs candidate

CMS official Higgs candidate

Masterclass linksMasterclass links

March 20th 2013 Masterclass 2013 Masterclass 2013

Pagina masterclasshttp://www.pd.infn.it/masterclasses/2013/

Risultati globalihttp://www.editgrid.com/qn-nd/qnmasterclasses/CMSWZ2013cern20003

Scaricare il DVD (MC2013 per accedere)

http://www.physicsmasterclasses.org/downloads/DVD2013/dvd.html

VideoconferenceVideoconference

March 20th 2013 Masterclass 2013 Masterclass 2013

Padova (Italia)

Zagabria (Croazia)

Budapest (Ungheria)

Lione (Francia)

Dublino (Irlanda)

Possible questions to be asked

•Life @ CERN

•Motivation to do physics

•Higgs bosons

•Other searches + QUIZ