
LHC Fellows Workspace
Submitted by kcecire
on Monday, October 8, 2012 - 10:48
This is where LHC and Neutrino fellows try out ideas, build agenda pages, and keep our important docs.
Description
Development and utilities for the QuarkNet LHC fellows.
CMS at P5 and CERN: Battle of the Bosons

Learn about the events!
![]() Use the Guide Sheet |
![]() View the Screencast |
![]() View the slides. |
![]() Play with the CMS Animation |
Try out some particle IDs!
![]() Is it a W+, W-, Z, or Higgs? |
![]() Is it a W+, W-, Z, or Higgs? |
![]() Is it a W+, W-, Z, or Higgs? |
![]() Is it a W+, W-, Z, or Higgs? |
See the results!
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|
|
More stuff!
CMS au CERN et P5: Bataille des bosons

IMC Classroom Prep

Evaluation data has shown that students who have been prepared for masterclasses report getting significantly more our of them and like them better.
Prior Knowledge for Masterclasses / Classroom Prep Objectives
Meeting these objectives will assure that students are well prepared for the masterclass.
- Describe the claim and indirect evidence in Rutherford's or another key experiment.
- Identify the peak in a histogram and explain what it means.
- Describe how quarks combine to form mesons and baryons.
- Apply conservation rules to measurements to provide evidence for unobserved particles.
Suggested Activities
Particle physics research requires the use of indirect evidence to support claims.
Rolling with Rutherford
Students will be able to:
- Describe the claim and indirect evidence in Rutherford’s experiment.
- Identify the peak in a histogram and explain what it means.
The Standard Model is the current theoretical framework for our understanding of matter.
Quark Workbench (instructions)
Students will be able to:
- Describe how quarks combine to form mesons and baryons.
The behavior of particles is governed by conservation laws and mass-energy conversion.
Choose one or both:
Students will be able to:
- Apply conservation rules to measurements to provide evidence for unobserved particles.
Additional Resources
CMS@CSI&ND2013: Event Analysis Training

Tiny URL for this page: http://tinyurl.com/cmscsind2013.
Learn about the events!
![]() Use the Guide Sheet |
![]() View the Screencast |
![]() Play with the CMS Animation |
Try out some particle IDs!
![]() Is it a W+, W-, Z, or Higgs? |
![]() Is it a W+, W-, Z, or Higgs? |
![]() Is it a W+, W-, Z, or Higgs? |
![]() Is it a W+, W-, Z, or Higgs? |
See the results!
![]() Mass plot from data collected between CSI start at 10:00 am and 1:30 pm. |
![]() Mass plot from data collected between 1:30 pm and CSI ending at 5:00 pm. |
![]() Combined mass plot for the entire day of CSI 2013. |
More stuff!
CMS Masterclass and Particle Physics Outreach

Resources for ICNFP2013Organizational
Educational
Download Contact |
Tiny URL for this page: http://tinyurl.com/l32hyws.
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CMS Data Express

Introduction
CMS Data Express is a short particle physics masterclass investigation that can be used as part of a workshop or as a short class project. The main goal is to separate Z candidate events from other events by visual inspection and then create a mass plot for the Z boson.
The Z boson is important in LHC discovery science and as a marker for calibration of LHC detectors: it is a well-known particle, so the location and width of the mass plot give physicists a good idea of how the detector is performing. The Z candidate events are "dimuon" events; the Z can decay into a muon pair. Z candidates are identified by 2 long muon tracks. Participants will search for Z candidates in the data.
The W candidate events consist of decays into single muons and neutrinos. However, the neutrinos do not interact with the detector and hence leave no tracks or energy deposits; their momenta are estimated by a process of summing all the momenta in the event to determine what is "missing". Thus a W candidate appears as a single long muon track in the detector.
Instructions
Individual or pair:
- Participate in analysis prep seminar
- Open the event display file
- Go to set of events assigned
- Categorize and record each event as
- W+ candidate (one muon track deflected clockwise)
- W- candidate (muon track defelcted counterclockwise)
- W candidate (muon track not clearly deflected; charge cannot be determined)
- Z candidate (2 distinct muon tracks)
- Unknown
- For each Z candidate, note the mass, round to nearest odd number, record
- When finished, count
- how many instances of each odd number you have recorded.
- how many W+ candidates you have.
- how many W- candidates you have.
Group:
Use your own resources or the data combination spreadsheet (Download xls) to
- Combine numbers of "odd masses" in all groups
- Create a histogram for whole group to observe
- Add numbers of all W+ candidates and all W- candidates; find ratio W+/W-
Discussion
The histogram created by the group is a mass plot. Since the mass of any one type of particle is uncertain by nature and due to experimental uncertainty, it will have a distribution the peak of which is the experimental determination of the mass. Creation of mass plots and other histograms are the central measurements made in the CMS e-Lab but with many more events than used in this exercise.
The ratio W+/W- is a probe of the proton structure and a comparison to the performance of CMS over a much larger data set.
Resources
CMS e-Lab suggested investigations

Introductory:
- J/Psi mass (must bin appropriately)
- compare Z-->mumu and Z-->ee
- Find how many peaks correseponding to real particles are in the 100k dimuon spectrum
- Show advantages and disadvantges of log x and log y plots
- Investigate use of bin widths to understand data
- global muon study
- charge study
Challenge:
- lifetime of particle
- find cosmic rays in data
- use Advanced in plot selection
- investigate parameters of detector through Advanced plots
- study and characterize background(s) in plot(s)
Resources: AAPT Modern Physics in the High School Classroom

AAPT Summer Meeting 2013 Session AF
Links:
- QuarkNet, /
- International Masterclasses, http://www.physicsmasterclasses.org
- QuarkNet e-Labs, http://www.i2u2.org/elab
- Particle Physics and More wiki, https://sites.google.com/site/306physics/home
- Sheldon learns to swim, http://www.youtube.com/watch?v=MnKoQbFXemE
Downloads:
- Exploring Elementary Particles with masterclasses and e-Labs (presentation)
- Reaching Modern Physics in an Inquiry-Based Physics First Curriculum (presentation)
- Students videoconference to compare their LHC particle event analysis (presentation)
- Acitvities from QuarkNet's Data Portfolio (presentation)
- Using the CMS e-Lab with High School Students (presentation)
- Plotting LHC Discovery (activity)
Contacts:
- Ken Cecire (session chair)
- QuarkNet staff
Data Workshop and CMS e-Lab Workshop pre-flight

Lead Teachers and Mentors should prepare the following for a workshop:
Preliminary (at least one week before workshop)
- Communicate with facilitator on prior knowledge and experience level of teachers
- Survey teachers on accounts: http://goo.gl/forms/yoKKBt5DCS
- Vidyo test for Virtual Visit (VV is optional)
Materials
- Name tags and markers/pens
- Protractors and rulers (Data Workshop only; more below)
- Possible activity printouts (see below)
- Poster paper or whiteboards
Venue
- Tables, outlets, lighting, space, etc.
- Set-up and clean-up of room
- Venue/parking passes if needed
- Food related: tea, snack, lunch?
- One computer for each 1-2 participants with good internet connection
- Projector and screen
- Black/white board & marker
- Materials for whiteboarding or similar activities
- Access to a printer
Human
- Mentor presence in workshop
- Physicist to speak on CMS, ATLAS, LHC, or other
- Ongoing communication before and after workshop
- International workshops: translators helpful
These may be printed or, in some cases, accessed on participant computers. Please consult with the facilitator before deciding what to print.
- Quark Puzzle (one per 5-10 participants with puzzle pieces cut)
- Z Mass events or Top Quark events (one event per 2 participants)
- ATLAS or CMS Data Express events (at least one full set)
- ATLAS or CMS masterclass cheat sheets (one per two participants)
- Protractor (in case someone needs it)
- Ruler (in case someone needs it)
