ISS @ ALICE Offline · T, for the proton-proton data analysis. We will study the distribution of...
Transcript of ISS @ ALICE Offline · T, for the proton-proton data analysis. We will study the distribution of...
DETAILED ANALYSIS OF JETS IN P-P AND PB-PB
COLLISIONS AT ALICE EXPERIMENT - JETALICE
COLLABORATIONCuriosity – Expertise – Collaboration – Challenge - Discovery
Programme : RO-CERNCapacities - Module 3 CERN
Project type : Romania’s participation at CERN
Project leader : Dr. Daniel Felea
October 22, 2013
ISS @ ALICE Offline
Mihaela Gheata– Participates in the CWG9 for QA and DQM, for Run3 software upgrade in the future ALICE O2 facilityand operates the central QA and AOD filtering trains.– She is involved in the data preservation activities in ALICE, contributing to the open access policy, to be approved by the CB.
3
Mihai Niculescu– Is responsible for the development and maintenance of the ALICE Offline Event Display and for the visualization framework in general.– He has been adding new functionality and features, as required by the evolution of the ALICE detector and offline reconstruction code for RUN2.
4
A rho event in Alieve (ALICE event display) –
AliRoot version 5-02-13-AN. LHC10h run 138730 pass 2 data,
10000138730001.20/AliESDs.root event 6
ISS @ ALICE PWG JE : JETS
Main Objective:To study the leading jets structure (traces of leading parton in event) and the underlying event (remnants of secondary interactions) in order to establish the basic energy distribution in hard collisions .
Secondary Objectives (per year):
2012: to study and characterize proton-proton collisions at 0.9 TeV.
2014: to study and characterize Pb-Pb collisions at 2.76 TeV and compare results with p-p reference data.
JETALICE – JETS6
JETALICE – JETS7
Slide from Rosi Reed’s presentation : “Jet Measurements in ALICE”, at “Jet quenching: the interface between theory and experiment” workshop, CERN, 11-14 February 2013
[email protected] � Adrian Sevcenco, Andrea Danu, Daniel Felea, Ciprian Mihai Mitu,
and Catalin Ristea have been studying the leading jets, with
kinematical cuts: 5 – 30 GeV in pT , for the proton-proton data
analysis.
� We will study the distribution of the main partonic energy through
hadronisation (i.e., the study of the transverse momentum
distributions and multiplicity in 20%, 40%, 60%, 80% from N and pT).
� Andrea Danu has produced a draft article with a comparative
analysis on the applicability of the Blast-Wave model for the ALICE
and BRAHMS experiments.
� Andrea Danu, Ion Sorin Zgura, Catalin Ristea, Adrian Sevcenco, and
Ciprian Mihai Mitu have submitted an article to the Romanian
Journal of Physics : “Comparisons among the hadron production in
ultra-relativistic heavy ion collisions in different transverse
momentum ranges. Preliminary results”
8
ISS @ ALICEDistribution of highest energetic particles;
FastJet 3.x – AntiKT algorithm (0.4 radius)
9
Interesting behavior
Interesting behavior
Analysis problem ?
10
ISS @ ALICEDistribution of highest energetic particles;
FastJet 3.x – AntiKT algorithm (0.4 radius)
Jet core + UE effects?
Neutral tracks contribution ~ √s ?
“Full jets” definition problem?
ISS @ ALICE
11
� Identification of redundant and inefficient use of cmake
include directives ;
� Identification of RangeDefinition usage and replacement
with Selector ;
� JetMedianBackgroundEstimator :: quantify the difference
in ρ determination and provide an easy method for legacy
usage ;
� JetMedianBackgroundEstimator :: σ calculation fixed.
Quantify the difference and provide a legacy method.
� GhostedAreaSpec :: bias in ρ estimates fixed; (different
ghosts placing). Quantify the difference and provide a
legacy method.
Validation of FastJet 3.x version for usage by ALICE
ISS @ ALICE12
Perspectives for 2014 (and 2015)
CERN collaboration
Figure from “Method for separating jets and the underlying
event in heavy ion collisions at the BNL Relativistic Heavy Ion”,
(J.A. Hanks et al.) Phys. Rev. C 86, (2012) 024908
Modified figure from the Gavin Salam’s presentation : “Thoughts on jet reconstruction in heavy-ion collisions”, at
“Jet quenching: the interface between theory and experiment” workshop, CERN, 11-14 February 2013
13
ISS @ ALICEPerspectives for 2014 (and 2015)
CERN collaboration
Correlation function C(R) vs. distance between particles (R) in Leading Jet, in p-p at 2.76 GeV Pythia event : Dc = 2.5 0.1
Ongoing p-p, p-Pb, and Pb-Pb Monte Carlo simulations and data analysis at LHC energies
ISS @ ALICE
14
� 14 ALICE papers published (B. Abelev, …, A. Danu, D. Felea, A.
Gheata, M. Gheata, M. Haiduc, C.M. Mitu, A. Sevcenco, I. Stan, I.S. Zgura et al.)
� 1 Oral presentation at the ACAT 2013, Beijing (M. Gheata)
� 1 Oral presentation at the CHEP 2013 (M. Niculescu)
� 1 Participation at GridKa School 2013 – at the Karlsruhe Institute of Technology, Germany (A. Sevcenco)
Result capitalization
15
ISS @ ALICE Outreach
The Romanian researchers study the beginning of the Universe.
The novel experiment from Geneva
Interview by Andrada Fiscutean (April 8, 2013) –Andrea Danu participated for the ISS-ALICE group
Yoda.ro (PRO TV)
16
ISS @ ALICE Outreach
During “The Researchers’ Night”,Andrea Danu participated for the ISS-ALICE group, on the 27th of September
2013, with a presentation of CERN and ALICE experiment : “CERN in images”
During “Otherwise School” Campaign, initiated by
the Ministry of National Education,Andrea Danu, Adrian Sevcenco, Ciprian Mihai Mitu
and Ionel Stan participated (April 1-5, 2013) at the outreach activities at the Institute of Space Science
400 CPU ( 550 kSI2K) - 640 GB memory - 210 TB storage space
10 GigE upstream connection to DANTE network through RoEduNet
ISS @ ALICE GRID Computing
� Second place in GRID Romanian Federation (18%)
� Close collaboration with WLCG Romanian partners (CONDEGRID)
� High utilization by ALICE user analyses (1%)
18
ISS @ ALICEHigh computing
contribution/cost ratio
Thank you !
19