LHC Data Hack

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= What is this hack? =
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[[Image:ldh_poster.jpg|border|600px]]


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==== What is this hack? ====


 
One of the experiments from the Large Hadron Collider (LHC), the Compact Muon Solenoid (CMS) experiment), has released a small amount of the data for educational purposes. However, it is hard to access and even more difficult to understand. Can we hack a better interface to these data? Can we create a website to allow others to use these data for education or art? Or can we do real '''science''' with these data ? I'll bring the data and explain what is in these datasets and some simple tools to interface with these data. Looking for hackers, coders, educators, artists and definitely designers, to figure out if this can be done.
 
One of the experiments from the Large Hadron Collider (LHC), the Compact Muon Solenoid (CMS) experiment), has released a small amount of the data for educational purposes. However, it is hard to access and even more difficult to understand. Can we hack a better interface to these data? Can we create a website to allow others to use these data for education or art? Or can we do real '''science''' with these data ? I'll bring the data and explain what is in these datasets and some simple tools to interface with these data. Looking for hackers, coders, educators, artists and definitely designers, to figure out if this can be done.


  


 
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= [[LHC_Data_Hack/The Large Hadron Collider (LHC)]] =
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=== [[LHC_Data_Hack/The Large Hadron Collider (LHC)]] ===


  


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= The Compact Muon Solenoid (CMS) detector =  
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=== [[LHC_Data_Hack/The Compact Muon Solenoid (CMS) detector | The Compact Muon Solenoid (CMS) detector]] ===


  


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= The data for this hack = 
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== What is a muon? ==
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=== [[LHC_Data_Hack/The data for this hack | The data for this hack]] ===


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A muon is a subatomic particle, related to the electron, but 200 times more heavy!
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It possesses either a positive or negative charge. 
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=== The analysis chain ===


  


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Muons do not interact very often with atomic nuclei that make up the CMS detector, and so they travel through much of the material and are relatively easy to detect.
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==== [[LHC_Data_Hack/Collisions in the detector | Collisions in the detector]] ====


  


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== Where are these muons coming from? ==
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==== Muons! Masses! ====


  


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When the protons collide in the LHC they produce many other particles. Some of
 


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these particles decay very, very quickly and produce a spray of other particles
 


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that are then detected in CMS. 
 


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Sometimes one of these particles decays to two muons. 
 


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Sometimes the muons are coming from two ''different'' parent particles. 
 


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The goal of this exercise is to figure out when the muons are coming from the same parent. To do this, we calculate the '''invariant mass''' of the two-muon system. If there is a preference for certain values of this mass, we may be seeing signs of the common parent particles!
 


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To calculate the mass, we have two choices:
 


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* Classical physics, which relates momentum, energy and mass from the equations of Newton.
 


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* Special relativity, which relates momentum, energy and mass from the equations of Einstein.
 


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We use the following variables for these values:
 


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* '''m''': mass
 


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* '''v''': velocity
 


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* '''KE/E''': kinetic energy/total energy
 


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* '''p''': momentum
 


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* '''c''': the speed of light (300,000,000 meters per second)
 


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=== Calculating the mass from Classical Physics ===
 


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p = mv
 


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KE = 1/2 m v^2
 


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KE = p^2 / (2 * m)
 


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=== Calculating the mass from Special Relativity ===
 


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E^2 = (p*c)^2 + (m*c^2)^2
 


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(m*c^2)^2 = E^2 - (p*c)^2
 


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With the data we are using, the units have taken into account the factors of c, so that we do not need to include it in our calculations (c=1).
 


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= The analysis chain =
 


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== Collisions in the detector ==
 


 
<font color="red">'''Science Hack Day contribution!'''</font>
 
<font color="red">'''Science Hack Day contribution!'''</font>


  


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These are various images produced using the [http://www18.i2u2.org/elab/cms/event-display/ browser-based iSpy detector], written by the CMS collaboration. 
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[[Image:lhd_screengrab_0.png|400px]]


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These are just 4 of the 100,000 events we analyzed this weekend!
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[[Image:dimuon_pic_1.png|300px]]
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[[Image:dimuon_pic_2.png|300px]]
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[[Image:dimuon_pic_3.png|300px]]
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[[Image:dimuon_pic_4.png|300px]]
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== Muons! Masses! ==
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<font color="red">'''Science Hack Day contribution!'''</font>
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[http://mattbellis.com/dimuons.html Check out this interactive demo that accumulates the di-muon masses.]
 
[http://mattbellis.com/dimuons.html Check out this interactive demo that accumulates the di-muon masses.]


  


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== Mass distributions ==
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==== [[LHC_Hack_Day/Mass distributions | Mass distributions]]====


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<font color="red">'''Science Hack Day contribution!'''</font>
 
<font color="red">'''Science Hack Day contribution!'''</font>


  


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[http://mattbellis.com/histogram.html Calculation of the masses assuming Classical Physics or Special Relativity]
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[[Image:pre_einstein.png|200px]]


  


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This visualization uses [http://mbostock.github.com/d3/ d3] and is rendering on-the-fly, so you may have to be patient as it runs over the dataset.
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== The parent particles and the original discoveries ==
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The first peak you see (in the Special Relativistic mass distribution) is the
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==== [[LHC_Data_Hack/The parent particles and the original discoveries | The parent particles and the original discoveries]] ====


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J/Psi particle which is composed of a charm and anti-charm quark. It was
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discovered in 1974 at SLAC and MIT almost simultaneously!
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* [http://prl.aps.org/abstract/PRL/v33/i23/p1404_1 Article]
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==== [[LHC_Data_Hack/Further code for exploration | Further code for exploration]] ====


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* [http://prl.aps.org/abstract/PRL/v33/i23/p1406_1 Article]
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The second peak is the Upsilon resonance.
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==== The contributors ====


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[[Image:ldh_hackers_0.jpg|border|400px]]


  


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= Further code for exploration =
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<font color="red">'''Science Hack Day contributors'''</font>


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* Matt Bellis


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* Lynn Root


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* Aaron Culich


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* Morris Mwanga (Kenya ambassador)


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* Tim Clem


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* Kevin


  


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= The contributors =
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Even before this project begins, thanks goes out to the CERN and Fermilab CMS collaborators who have helped get this off the ground.


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* Tom McCauley (FNAL)


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* Tom Jordan (FNAL)


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* Giulio Eulisse, developer of ig and iSpy (FNAL) 


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* Kati Lassila-Perini (CERN)


Latest revision as of 23:37, 17 November 2011


Ldh poster.jpg



Contents





  What is this hack? 


One of the experiments from the Large Hadron Collider (LHC), the Compact Muon Solenoid (CMS) experiment), has released a small amount of the data for educational purposes. However, it is hard to access and even more difficult to understand. Can we hack a better interface to these data? Can we create a website to allow others to use these data for education or art? Or can we do real science with these data ? I'll bring the data and explain what is in these datasets and some simple tools to interface with these data. Looking for hackers, coders, educators, artists and definitely designers, to figure out if this can be done.





  LHC_Data_Hack/The Large Hadron Collider (LHC) 


   The Compact Muon Solenoid (CMS) detector 




   The data for this hack 


  The analysis chain 


   Collisions in the detector 


  Muons! Masses! 


Science Hack Day contribution!

Lhd screengrab 0.png

Check out this interactive demo that accumulates the di-muon masses.



   Mass distributions


Science Hack Day contribution!

Pre einstein.png





   The parent particles and the original discoveries 


   Further code for exploration 


  The contributors 


Ldh hackers 0.jpg

Science Hack Day contributors



  •  Matt Bellis

  •  Lynn Root

  •  Aaron Culich

  •  Morris Mwanga (Kenya ambassador)

  •  Tim Clem

  •  Kevin



Even before this project begins, thanks goes out to the CERN and Fermilab CMS collaborators who have helped get this off the ground.



  •  Tom McCauley (FNAL)

  •  Tom Jordan (FNAL)

  •  Giulio Eulisse, developer of ig and iSpy (FNAL) 

  •  Kati Lassila-Perini (CERN)








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																 This page was last modified on 17 November 2011, at 23:37.
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