Welcome to an experiment in particle physics education -- the Masterclass in particle physics with online preparation!

How to use this site:

1. Sign up using the form just below to the right: name, email, most advance science, and desired level of masterclass activity.
2. Review three sets of slides--overview, background, particle ID--in order, below.
3. Find out which events are assigned to you using the table posted below.
4. Access the Hands-on-CERN site, and use the same sign-up form to correctly post identification of one event of each of the five types listed on that form.
(Steps 1 - 4 are MASTERCLASS "LITE")
5. If you want to push further into the full masterclass experience, use the second form, below, to register a team by Sunday, 2/21. Your team will be emailed a fuller set of events to analyze together. You'll use the first sign-up form to identify the event types for the events in your team's assigned set.
6. If you've completed steps 1-3 and worked on step four, you're invited to come to the International Masterclass teleconference at the Robinson Community Learning Center (see map) on Feb 26th from 8:30 AM - noon. Good luck!

Sign up & Overview



Background


Particle ID


Where's the data?

Events.pngLook at the Hands-on-CERN image below, notice where the arrow is pointing to on the screen, and then CLICK ON THAT IMAGE (or just click on THIS LINK) to access data for the Masterclass. Which of the events from the collision library (linked from the web page, but pictured to the right) should you use? See further below for a table pairing up masterclass participants with sets of events.
Hands-on-CERN.png

Which data should you use?

Here's an image of the LEP Collision Library for Masterclass. Here's how we'll break up the data: if your last name begins with the following letter, select events at random from the following event numbers:
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
1-40
41-80
81-120
121-160
161-200
201-240
241-280
281-320
321-360
361-400
401-440
441-480
481-520
521-560
561-600
601-640
641-680
681-720
721-760
761-800
801-840
841-880
881-920
921-960
961-1000
?
If your last name begins with Z, we've run out of sets of 40 after 25 letters of the alphabet. So take at most 2 events from any of the sets of 40 across the full data set until you've found your five events:) How do you find your specific assigned events? Unfortunately, you've got to begin with the closest set, and count off the right number of clicks as you advance to the appropriate events. So to find event 41, start with the first set of 100, and advance by 40 clicks of the ">" arrow to the right of the event number.

MASTERCLASS "LITE": THESE ARE THE DATA YOU MUST USE TO FIND ONE EVENT OF EACH OF THE FIVE TYPES: Z TO e,e; to mu, mu; to tau, tau; to 2-jet, and to 3-jet. IF YOU CANNOT FIND AN EVENT OF ANY GIVEN TYPE IN YOUR OWN DATA SET, YOU MAY MOVE ON TO THE NEXT HIGHEST DATA SET, AND SO ON. (If you start with high numbers and run out, go back to the low numbered sets.)

MASTERCLASS "FULL": Once you've done your five events for the "Lite" requirements, form a team of two or three. You'll be assigned (once signup for "Full" is completed and you've notified me of your team membership) a set of about 40 events, all of which you should analyze together as a team.

EVERYONE: When you've analyzed an event, use the form in the upper right of this page--the same one you used to register--and enter the following: 1) Your name or team name; 2) the event number; 3) the event type; and 4) how certain you are that your event type identification is correct.

TO REGISTER A TEAM

FOR THE FULL MASTERCLASS, use the form below; your team information will appear in the spreadsheet to the right of the form when you've submitted the form and refreshed the page. Come back to this page a bit later to see the data your team will by then have been assigned, in the far right column of the spreadsheet:



Two teams (thus far) have other tasks requiring them to look through (as much as they can of) the entire data set. One task is to find events which have Ecms >>91 GeV (= Energy at the center of mass of the system, which is roughly the initial energy available in the collision). We want to isolate those events, since their excess initial energies are beyond the 91 GeV (Giga electron volts) necessary to create the Z boson at rest, and thus are sufficient to enable some other kinds of processes in addition to Z production. These events--while interesting--aren't useful for tallying up the ways that Zs decay. To mark these events, identify them as event type "other" and place ">91 GeV" in the box. Another team is asked to find really difficult-to-identify events, so that we can discuss them together in the teleconference on Friday. To mark these events, identify them as event type "other", place "tough event" in the box next to "other", and then select "no clue--need help" on the confidence level. The next team that signs up will be invited to find Z to 4 jet events, marking them as "other" with "Z to 4 jet" in the box. There are other tasks remaining, also...register your team if you haven't, or write me if you want more to do:) Subsequent teams: inspect random event identifications from other teams, and verify or correct another team's event identification. Use the table of identified events, below.

Identified Events



Reported events categorized

Events categorized as of 3/6/10
Events categorized as of 3/6/10



Need a little more help identifying events? Again, see the third slide set (above) introducing the layout of the LEP detector and explaining how to identify each type of event. Then see this blog post from NDeRC graduate fellow Doug Berry, a graduate student in particle physics at CERN. Also, some of the events submitted with lower confidence levels marked in the form will be posted in the slide set to the left. Finally, a summary of the identification rules of thumb is pictured below.
MasterclassCheatSheet.png