Submitted by kcecire
on Tuesday, October 1, 2013 - 16:18
When QuarkNet does a workshop or other project that falls outside the current parameters, it can have a QuarkNet home here.
QuarkNet projects outside of center or data portfolio groups.
Study the W bosons produced in the Large Hadron Collider.
Tiny URL for this page: http://tinyurl.com/lnwmrf8
Protons collide with incredible energy in the Large Hadron Collider. Sometimes the result of one of these collisions is a W boson - the particle which mediates the weak nuclear interaction. W bosons can be positive (+) or negative (-) in charge. But...
- How often are W+ bosons made compared to W- bosons in the the LHC?
- Should it be equal because nature has no preference?
- Should we see all W+ because the proton is positive?
- Can we find out?
- Learn a little about LHC, the CMS detector, and finding W candidate events. Look at the introductory slides.
- Make teams of two and divide the available CMS events among the teams. Each team also gets a report page.
- Characterize your events and count them:
- W+ candidates have a single long red muon track which curves clockwise in the magnetic field of CMS.
- W- candidates have a single long red muon track which curves anti-clockwise in the magnetic field of CMS.
- W? events are too hard to measure so we cannot tell if they are W+ or W-.
- Background events have more than one muon or are altogether different.
- Add them up on the report page. Then collect all the reports from all the teams and add up the number of W+ candidates and the number of W- candidates. Calculate W+/W-. If you like, you can use this spreadsheet.
- Find what the result was for CMS. How close was your group? Why do you think we get the answer we get? (Hint: it has to do with the structure of the proton,)
- Did you notice the mass in GeV on each event? We use these to find the mass of the Z boson in the standard CMS Data Express. Try it with your students!
- Your students can do even more with a CMS or ATLAS masterclass. Talk with a physicist near you about International Masterclasses.
- For a more intense data experience, try the CMS e-Lab.
- Have questions about this activity? Send an e-mail and ask.
A.W. Smith Building, Room 11, Case Western Reserve University (map)
Tuesday, December 10, 2013
Tiny URL for this page: http://tinyurl.com/ny5gomp
Questions? Follow-up? More?
The International Linear Collider (ILC) will give physicists a new way to study the Higgs boson with great precision. The ILC will be an electron-positron collider. Electrons and positrons will be produced and then accelerated to high energies before they collide. A result of these collisions can be the Higgs boson. To understand what physicists will look for to find the Higgs signal in ILC, we will examine Z and WW decays from the Large Electron Positron collider (LEP), which operated until 1999 in the tunnel which now houses the Large Hadron Collider.
- Use conservation laws to explain and characterize the decays of Z and W bosons in LEP.
- Use the hypotheses formed about Z and W decays to predict the patterns of Higgs boson event in ILC.
- LEP Z-decay. Examine the slides of decays of Z-bosons and try to characterize the patterns according to decay products (particles), number of tracks, energy loss, and anything else you observe. This does not all have to be quantitative. Take notes. Discuss and form a consensus on how the Z boson decays. Resources: Slides (original, inverted colors), Information sheet, Notes sheet.
- LEP WW-decay. Examine the slides of decays of pairs of W-bosons and try to characterize the patterns according to decay products (particles), number of tracks, energy loss, and anything else you observe. This does not all have to be quantitative. Take notes. Discuss and form a consensus on how the W boson pairs decay. Resources: Slides (original, inverted colors), Information sheet, Notes sheet.
- Higgs in ILC. Examine the ILC/Higgs slides to learn how the Higgs boson will be produced in ILC. Use what you have learned from LEP events to predict what the Higgs events in ILC will look like. Draw diagrams and share these with your colleagues. Resources: Slides, Information sheet, Notes sheet, poster board, markers.
- ILC homepage
- CMS masterclass in Japanese
- Japan pickes Tohoku site for International Linear Collider (AAAS Science Insider)
- If constructing detector(s):
- CRMD kit
- 6000 series CRMD assembly instructions (included with CRMD kit)
- multi-meter (digital, accurate to 0.01 v or better)
- ruler or meter stick
- "tongue-depressor" stick (in CRMD kit)
- razor or box cutters
- tape measure (50ft/20m)
- extra cotton gloves for handling scintillator
- optional: oscilloscope
- 3/4" (~2 cm) and 3" (~8 cm) electrical tape -- black vinyl
- ** 1/2" (~1.3 cm) teflon plumbing tape
- power strip(s) for computers and CRMD
- good room to construct and setup the detector with table top space
- access to the outside for placement of the GPS receiver: must have clear view of the sky and within 75 feet of the detector for cable run (antenna can look through a window)
- one computer with USB port for talking to the detector and capturing data
- USB drive for each teacher to upload data and download online files
- verify: data computer will not go into 'sleep' mode; Windows: check 'Control Panel'
- need apps: 'hyperterm' on Win; 'ZTerm' on Mac. These can be downloaded free.
- USB drivers installed on data computers for “6000” series DAQ, found at:
- User agreement for teacher who will use the detector at school
Needed for the e-Lab workshop:
- build teacher accounts ahead of time. Need:
- access for facilitator machine on the local network
- computer access for each participant with internet (IT staff available: trouble-shooting)
- root access to each computer for installing apps and rebooting.
- ability to print e-Lab resources
- LCD projector: two would be best, but one is OK
- black/white board & markers
- Set-up and clean-up of room
- Name tags (optional but helpful; romaji kudasai)
- Tables, outlets, lighting, space, etc.
- Computers for detectors and presentation (QuarkNet team may have sufficient for presentation)
- Projector and screen
- Internet Access (important)
- Notebooks/pens/markers (participants bring?)
- Venue and/or Parking Passes if Necessary
- Food related: tea, snack, lunch?
Important Human Elements:
- Physicist to give teachers a talk on cosmic rays
- Presence of local physicist-mentor(s) for teachers
- Continued communication after the workshop
- Translator(s) are helpful for international workshops
Tiny URL for this page: http://tinyurl.com/todaicosmic2013
At the conclusion of the workshop, participants will:
Subject to revision
Saturday November 9
10:00 Registration and greetings
10:30 Presentation on Cosmic Rays (Kanaya)
11:30 Introduction to QuarkNet Cosmics (Brooks, Cecire)
13:00 Cosmic Ray system construction and set-up
15:00 Start first data collection
15:30 Guided exploration of e-Lab
16:00 Upload data together
16:30 BLESSING and FLUX studies
17:00 Adjust detector and set up for overnight run
17:30 Close for evening
Sunday November 10
10:00 Greetings and data upload from overnight run
10:15 Divide into groups; BLESSING and FLUX on new data
11:00 Groups study e-Lab Posters, begin short project
13:00 Project work
14:30 Project presentations
17:00 Discussion and closing
17:30 End of workshop
Resources for teachers
Recommendation: Spend 30-60 min on one of these
Cosmic Ray Physics
|Animations and Videos
Watch and share with students
Local organizers: please see the workshop Requirements page.