Particle physics on Steem - let’s start coding on the MadAnalysis 5 platform by lemouth

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· @lemouth ·
$45.28
Particle physics on Steem - let’s start coding on the MadAnalysis 5 platform
<div class="text-justify">

I hope you all had a nice summer. Fall is almost there and it is timely to resume this particle physics project on Steem **allowing non-physicist to contribute to state-of-the-art research in particle physics** by contributing to the [**MadAnalysis 5**](https://github.com/BFuks/madanalysis-utopian) platform.

<center><img src="https://s33.postimg.cc/z2whd9s6n/lhc.jpg"><br /><sub>[image credits: <a href="https://cds.cern.ch/record/1211045">Maximilian Brice</a> (CC BY-SA 4.0)]</sub> </center> 

I will not enter into details, as everything has been largely documented in all the posts given below. For any newcomer, a good start is  the [**3-month status report**](https://steemit.com/utopian-io/@lemouth/running-state-of-the-art-particle-physics-research-on-steem-a-status-report-after-3-months) that I posted right before leaving for my offline vacation place (and all references within).

Here, I instead solely focus on **3 LHC analyses** which I would like the participants (so far, the main contributors are **@crokkon, @effofex, @irelandscape, @mactro**) to tackle. 

Two of them (task requests 1 and 2) concern [**supersymmetry**](https://steemit.com/science/@lemouth/new-phenomena-in-particle-physics-searching-for-our-dear-susy-aka-supersymmetry). Supersymmetry consists in one of the most studied theories extending the Standard Model of particle physics, and offers a bunch of new phenomena to use as handles for searching for it. 

The last one (task request 3) focuses on [**dark matter**](https://steemit.com/steemstem/@lemouth/dark-matter-from-its-origins-to-its-freeze-out), one of the key concept behind standard cosmology. The nature of dark matter is still unknown, assuming it exists, as alternative are still viable. Producing and observing it at particle colliders is thus vital for our understanding of nature.

Finally, as a bonus, anyone who would like to finish the [**dark matter analysis**](https://arxiv.org/abs/1706.03794) used in the exercises that we achieved is welcomed to do so.

___

## <center><b> General rules </b></center>
___

After discussing with Utopian.io moderators, it has been decided that **each contribution will have to be submitted in a fresh GitHub repository** containing the C++ implementation, in the MadAnalysis 5 framework, of one or more of  the analyses proposed below.

Please also do not forget to **tag me** in your post detailing your implementation and to **leave a comment to this post** (with the link) so that I could notice your work.

<center><img src="https://s17.postimg.cc/6pvmmnn8f/pokpok.jpg"><br /><sub>[image credits: <a href="https://pixabay.com/en/big-bang-armageddon-explosion-pop-466312/">geralt</a> (CC0)]</sub></center> 

On top of the various posts related to this project, [**an extensive documentation**](https://arxiv.org/abs/1808.00480) (of 100 pages) has been released last August. I recommend to browse it, and in particular its second technical appendix that contains all methods available within the MadAnalysis 5 package.

All submissions will be reviewed, and allowed to enter the second phase of the project if correct. The second phase of the project will address validation, which is by far not trivial and necessary for being included in the [**Public Analysis Database of MadAnalysis 5**](http://madanalysis.irmp.ucl.ac.be/wiki/PublicAnalysisDatabase). 

Such a validation procedure requires to simulate LHC collisions and to reproduce experimental predictions to some extent. This is what we will talk about in a month or so.

#### All contributions have to be submitted by September 28th. Good luck everyone!

___

## <center><b> TR1. Supersymmetry with ATLAS </b></center>
___

The task request 1 focuses on a [**search for the supersymmetric partners of the Higgs bosons**](https://arxiv.org/abs/1806.04030) by the ATLAS collaboration. The sections 5 and 6 of this scientific article contain the description of the analysis. 
 - Object definitions are detailed in Section 5 (very similar to the exercises).
 - 8 low-mass signal regions are defined in section 6.1.1 (summary in table 2)
 - 2 high-mass signal regions are defined in section 6.2.1 (summary in table 5).
 - The design of some of the variables may sound complicated. Feel free to ask for help.
 - Control regions can be ignored.


___

## <center><b> TR2. Supersymmetry with ATLAS - again </b></center>
___

The task request 2 focuses on a [**search for the supersymmetric partners of the quarks and gluons**](https://arxiv.org/abs/1805.11381) by the ATLAS collaboration. The sections 5 and 6 of this scientific article contain the description of the analysis.
 - Object definitions are detailed in Section 5 (very similar to the exercises).
 - Section 6 details various signal regions: 3 classes of "*high-pt*" signal regions (see table 3) and 2 classes of "*low-pt*" signal regions (see table 4).
 - Each class of regions contains varied subregions according to the value of an *m<sub>ll</sub>* variable (see tables 7 and 8). All those signal regions must be implemented independently.
 - Control regions can be ignored.

___

## <center><b> TR3. Dark matter with CMS </b></center>
___

The task request 3 focuses on a [**search for dark matter**](https://arxiv.org/abs/1806.04771) by the CMS collaboration. The sections 4 and 5 of this scientific article contain the description of the analysis.
  - Diphoton channel: object definitions are detailed in Section 4.1 that also includes the analysis itself. There are two signal regions.
  - Ditau channel: object definitions are detailed in Section 5.1 that also includes the analysis itself. There are three signal regions.

___
## <b><center>References</center></b>
___

 - [**Ref. 1**](https://steemit.com/utopian-io/@lemouth/towards-an-utopian-contribution-to-particle-physics-the-roadmap-and-how-to-get-started): installation instructions and generalities on the MadAnalysis 5 framework.

 - [**Ref. 2**](https://steemit.com/utopian-io/@lemouth/particle-physics-utopian-detecting-particles-at-colliders-and-implementing-this-on-a-computer): reconstructing photons, electron and muons in a detector; basic C++ programming in the MadAnalysis 5 framework.

 - [**Ref. 3**](https://steemit.com/utopian-io/@lemouth/particle-physics-utopian-implementing-an-lhc-analysis-on-a-computer-the-physics-objects): properties of all objects reconstructed in a detector; introducing jets. 

 - [**Ref. 4**](https://steemit.com/utopian-io/@lemouth/particle-physics-utopian-io-objects-isolation-histogramming-and-a-first-task-request): Histogramming and object isolation.

 - [**Ref. 5**](https://steemit.com/utopian-io/@lemouth/particle-physics-utopian-io-designing-an-lhc-search-strategy-for-unraveling-new-phenomena): implementing an analysis strategy, selection cuts and signal regions.
 
 - [**3-month status report**](https://steemit.com/utopian-io/@lemouth/running-state-of-the-art-particle-physics-research-on-steem-a-status-report-after-3-months) of the project.

</div>
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vote details (1300)
@greenrun ·
This application is the moment when I wish I know how to program in C++, but as my grandma used to tell me, "It is never too late to start.''
👍  
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@lemouth ·
No it is never too late. It is also pretty quick: a couple of afternoons. :)
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@greenrun ·
Now, that sounds like an offer I cannot refuse :D

Posted using [Partiko Android](https://steemit.com/@partiko-android)
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@alexdory ·
$0.02
A couple of afternoons if you already are proficient in Matlab or Java :)
But yes, programming is easy, @greenrun, a lot of fun and has the ability to keep Mr.Alzheimer away :D 
A lot of video tutorials out there, some you may even listen to in your car. 
We actually have a success case with a young girl banker who wanted  to be a programmer at 25. She enlisted in our paid-academy (we did the paying) projects. It took her 3-6 months to reach a comfortable level in .NET 
She got an offer to work full time here afterwards. 
So follow what you like and working people will usually be rewarded in life. 

Cheers!
👍  
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@irelandscape ·
Ah, we are now reaching the main course. ;-)
I'll have a look at the reference documents when I get a chance.
Just to get an idea of the scope of work, would you say this is a much bigger task than previous exercises?

Cheers!
👍  
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@lemouth ·
Not necessarily. I think that the TR1 and TR2 are harder and may require an afternoon or two. TR3 is easier. But at the end of the day, the difficulty is the same as for the exercises. The only subtlety is that these analyses contain more than one signal region. Therefore not more complicated, but longer to implement.
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@irelandscape ·
OK, I think I will try to work on TR3 in that case.
I'm really swamped at the moment so it probably makes sense that I pick the "lighter" task this time.
I had a look at section 4 and 5. As usual it's very hard to understand for me so I will probably have a few questions in the coming days!
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@ecoman1 ·
t heve best stratecy...i think,,,
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@lemouth ·
I beg your pardon?
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@nikolanikola ·
This project looks really interesting, I would love to dig more about it as soon as I get more free time. 

Looks like it's time to renew my object-oriented programming knowledge :')
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@lemouth ·
Anytime is good! I would be more than happy to have more participants on board! :)
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@effofex ·
And so it begins. Again.  I'll read up a bit and see if this is for me.  Will you be fleshing out the TR's at all - things like example input data?
👍  
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vote details (1)
@lemouth ·
This will be addressed when we will start validating the different pieces of code, which will come later. Validation is by far not trivial here, as it goes beyond just agreeing with a scientific article. But we first need to have something to be validated, i.e. working codes.
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@amosbastian ·
$3.06
Thanks for the task request(s) and good luck finding people who can solve it/them.

Your contribution has been evaluated according to [Utopian policies and guidelines](https://join.utopian.io/guidelines), as well as a predefined set of questions pertaining to the category.

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vote details (7)
@lemouth ·
Thanks for the feedback. I agree with all points and i really hope to see some contributions. For this, however, we will need to wait ^^
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@utopian-io ·
Thank you for your review, @amosbastian!

So far this week you've reviewed 2 contributions. Keep up the good work!
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@steem-ua ·
#### Hi @lemouth!

Your post was upvoted by @steem-ua, new Steem dApp, using UserAuthority for algorithmic post curation!
Your post is eligible for our upvote, thanks to our collaboration with @utopian-io!
**Feel free to join our [@steem-ua Discord server](https://discord.gg/KpBNYGz)**
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@vanarchist ·
I'm interested in trying to help out but how do I know if someone is already working on the task I would work on?
👍  
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vote details (1)
@lemouth ·
To my knowledge, TR3 is taken by @irelanscape. The two others are still free.
👍  
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@utopian-io ·
Hey, @lemouth!

**Thanks for contributing on Utopian**.
We’re already looking forward to your next task request!

**Get higher incentives and support Utopian.io!**
 Simply set @utopian.pay as a 5% (or higher) payout beneficiary on your contribution post (via [SteemPlus](https://chrome.google.com/webstore/detail/steemplus/mjbkjgcplmaneajhcbegoffkedeankaj?hl=en) or [Steeditor](https://steeditor.app)).

**Want to chat? Join us on Discord https://discord.gg/h52nFrV.**

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@rudyardcatling · (edited)
i assume you won't be considering sourceforge as a microsoft-free alternative ![grin.png](https://cdn.steemitimages.com/DQmPBg2wyRGCxHJXkHQeiR4VMHV1xdn6Uo3AZRYzGqTvLJ6/grin.png)

it's great to see steemchain getting practical application in "the real world" in any case. Please discover something that enables FTL, corrects Einsteins framework and/or allows forward timetravel because i always feel ive been born 1000 years too soon (or maybe too late ... there's a certain charm at just bashing someone to a pulp to get what you want although its really something that should be considered only as a last resort dealing with those who don't understand anything but violence ofcourse)

j/k

great work, looking forward to the next lecture steemit lecture :D

<blockquote>
everything's possible until proven otherwise, i am neither an atheist nor a believer and if  there's an infinite number of here between this and that, why should i ?
</blockquote>
(me, trying to get my fortune cookie on)

seriously, i dont understand why the Ned doesn't propagate this more " <b> We are working WITH CERN on data for the large hadron collider</b>

in a place full of self-proclaimed free thinkers, and a lot of i know better people, what could go down better, lol (i still think an educational free to download game on steam(not steem) that uses gpu and cpu resources like boinc would be a good idea but i'm not upper class so thats more for #utopian-io to decide is it not  :p as i said previously, i doubt the Gaben wouldnt jump at a chance like that too)

and then some ... unfortunately, as always, the house doesn't clean itself.

yours truly,

sarcastiCat :p
👍  
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vote details (1)
@lemouth ·
>  i assume you won't be considering sourceforge as a microsoft-free alternative 

What??! No for god sake! :D

> seriously, i dont understand why the Ned doesn't propagate this more " We are working WITH CERN on data for the large hadron collider

Well, this is a question for him and not for me...

> in a place full of self-proclaimed free thinkers, and a lot of i know better people, what could go down better, lol (i still think an educational free to download game on steam(not steem) that uses gpu and cpu resources like boinc would be a good idea but i'm not upper class so thats more for #utopian-io to decide is it not :p as i said previously, i doubt the Gaben wouldnt jump at a chance like that too)

Here, I need help from people, not from computers. That is where the difference lies :)
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@rudyardcatling ·
yea, well i'm not a first name basis with the upper-Ned here lol so you're right, but i just don't get it, its like a flashy neon-sign for a realworld blockchain application plus free advertising for steemit

but your people need computers to help you so i *still* think the game would be a good idea, maybe if i keep on the programming i can try myself in a year or two :) put my name on it and advertise myself with it hahah
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@irelandscape ·
$0.03
OK, here are my first questions related to TR.3.

My understanding of the signal regions is:
**For the diphoton channel**: Signal regions are |&eta;| < 1.44, and 1.57 < |&eta;| < 2.50
**For the &tau;+&tau;- channel**: Signal regions are  e&tau;h, &mu;&tau;h and &tau;h&tau;h decay channels
Is this correct?

My undestandting of signal region **e&tau;h** is that:
h (higgs) decays into  &tau;+&tau;- (tau and anti-tau), and then that the &tau;+ decays into an electron (+neutrinos), while the +&tau;- decays into hadrons.
Is this correct?

Should the program generate histograms?

Show the program generate cut flow reports?

Do you have any sample data that I could run the program against?

That's it, I'm sure I'll have more questions in the future! :-)

Thanks!
👍  
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vote details (1)
@lemouth ·
Let me clarify all of this.

> For the diphoton channel: Signal regions are |η| < 1.44, and 1.57 < |η| < 2.50

Those consist indeed in the pseudorapidity requirements on the signal photons.

> For the τ+τ- channel: Signal regions are eτh, μτh and τhτh decay channels

Correct. Here, all potential decay modes of the pair of taus are considered. They are 3 of them:
 - τ > e + neutrinos;
 - τ > mu + neutrinos;
 - τ > jets + neutrino (this corresponds to what is called a hadronic tau τ<sub>h</sub>, which has the largest probability to occur).

Since we have two taus, we have 3 potential channels after enforcing the presence of one hadronic tau (modes with two electrons, two muons or one electron and one muon yield too few potential signal events because of the small decay probability).

> My undestandting of signal region eτh is that:
h (higgs) decays into τ+τ- (tau and anti-tau), and then that the τ+ decays into an electron (+neutrinos), while the +τ- decays into hadrons.
Is this correct?

This could also be the opposite, as here, the charge is not considered. Therefore, what is called an electron could also be a positron.

> Should the program generate histograms?

If histograms are declared as mentioned in the relevant posts, text files with the histogram data will be generated after running the program. We can safely include the histograms of figure 4.

> Show the program generate cut flow reports?

All cuts must be appropriately implemented, and as detailed as possible to facilitate the validation. We will discuss this in greater details in a month or so.

> Do you have any sample data that I could run the program against?

I think I can find the Z'-2HDM model from the signal of figure 4. This is actually what we will learn in the next step of this project: how to generate samples to validate what we are coding  :)
👍  
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vote details (1)
@irelandscape ·
OK, thanks. I think I have enough to get started.
Cheers!
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