ELFT HÍRADÓ

[Balog Janos <balog.janos AT wigner.mta.hu>]

RMI Elméleti Osztály Szemináriuma
Tisztelettel meghívjuk




                       Andrew Lowe
                   (Wigner ALICE Group)


  "Quark/gluon jet tagging for ALICE: Machine learning for hadron 
physics using R"


                címmel tartandó szemináriumára.


Kivonat:


Search strategies for new physics often depend on being able to 
efficiently discriminate between signal and background processes. To do 
this, we try to identify quantitative characteristics of each that will 
enable us to differentiate between them. In many cases, there are an 
enormous number of potential discriminant variables which we would like 
to combine to improve sensitivity. This naturally leads to the following 
question: how should we choose relevant discriminants that are minimally 
correlated with each other and provide the best predictive power? 
Similarly, given a newly-proposed discriminant variable, how can we rank 
this new variable against those we already know?

In this talk, I will outline systematic methods for ranking and 
selecting discriminants to maximise classification performance. 
Specifically, I will describe how these methods can be used to choose 
the best discriminant variables for use in a prototype jet tagging 
algorithm that could be used by the ALICE experiment at CERN for 
differentiating between quark-initiated and gluon-initiated jets. I will 
also introduce a new discriminant variables that have not previously 
been considered for quark/gluon jet tagging that were found using these 
methods.

This talk will present a walkthrough of the development of the 
prototype jet tagger and show promising preliminary results that are 
suggestive of the potential impact that this work could have on many 
physics analyses. Although presented in the context of jet tagging, the 
machine learning methods described in this talk could be of enormous 
benefit to the particle physics community and could lead to a marked 
improvement in discovery reach.


Helye: Wigner FK RMI III. ép. Tanácsterem
Ideje: 2014. december 11. csütörtök du. 14:00 óra




Szívesen látunk minden érdeklődőt.
                                            Balog János