LHCb Global Particle ID

ADFSlarge_prism

These pages are for the LHCb Global Particle ID, the combination of the individual sub-detector PID performance measures into a single source of information to be used by the physics applications. Questions or comments concerning Particle Identification may be sent to the following mailling list: lhcb-phys-PID-topics@cern.ch. Please use this mailing list for general PID topics; questions that involves PIDCalib see below.

---+ PID samples in Run2.

Here a summary of

Mentoring at LHCb.

During the first ECGD meeting, 1st December 2014, the topic of mentoring has been discussed. Following the responses collected during the meeting and with the agreement of LHCb management, it has been decided to establish a mentoring system at LHCb. This of course heavily relies on participants, those who volunteer to provide mentoring, and those who use them. Mentoring can be a very helpful tool for coping with the intricacies of your job and your career, and should also be fun and rewarding experience for all involved.

The mentoring role can take several forms. Full mentoring would imply regular meetings/discussions with the individuals or the group associated with that mentor. But a more limited service is also highly valued, such as commenting on job applications / CVs, especially for job applications.

In the table below, you can see what kind of service each mentor is able or willing to offer.

1) Chat. For people, typically at the very beginning of his/her career, who feel the need of speaking with someone in the field (different from her/his supervisor). We encourage regular, scheduled meetings between mentor the individual or group being mentored.

2) CV. Help in preparing the "right" (country-related, position-related, ...) CV.

3) Country. This lists the countries where the mentor has some expertise about the structure of the (academic or industrial) job market, application system, how a CV should look like, what style is appreciated in the CV, etc. Useful to know if you ask for comments on your job applications, for example.

Mentors are all the "experienced colleague" who sign up voluntarily to this page. To sign up, you can edit and modify this Twiki page adding in the Table a line with your data, or you can ask one of us to do this for you (send an email to barbara.sciascia@cernNOSPAMPLEASE.ch or jonas.rademacker@bristolNOSPAMPLEASE.ac.uk).

To contact a mentor, just write an email to her/him. If - for any reason - you don't want to contact directly a mentor, write an email to one of us (barbara.sciascia@cernNOSPAMPLEASE.ch or jonas.rademacker@bristolNOSPAMPLEASE.ac.uk) and we'll do it for you (we will even find a mentor for you if you cannot make up your mind).

Name mail Chat CV Country
Barbara Sciascia barbara.sciascia@cernNOSPAMPLEASE.ch Yes No Yes: Italy
Jonas Rademacker jonas.rademacker@bristolNOSPAMPLEASE.ac.uk No Yes Yes: UK, Germany
Super Mario none yes yes Italy
Bob Builder none yes yes UK

PIDcalib

All is here: https://twiki.cern.ch/twiki/bin/view/LHCb/PIDCalibPackage

Particles

Topics:

Open Tasks for LS1

A set of tasks has been identified that require effort during 2013-14 (and beyond). These are important to maximise the physics potential of the existing data, and to prepare for higher energy collisions. The concept was outlined in a talk at the LHCb week, 7 September 2012, and further details were given in talks ( introduction, tracking, alignment and vertexing, high level trigger) at the LHCb week, 28 November 2012. The full list of tasks is available as an attachment to this Twiki page.

Lists of PID tasks

High Priority

Electron samples in PIDCalib


Other comments  
Task name Electron in PIDCalib
Lead (tools, or other) group PID
Other relevant groups (if any) Neutral objects
Task description Add in PIDCalib electron samples from J/psi -> ee decays; add to the other samples the variables to be tested again the electron hypothesis
Estimated total effort required (FTE) 0.3 FTE for 4 months.
Start of working Yes, Jan 2014
Deadline ASAP
People/groups currently involved Thomas Bird, Sneha Malde
Past studies and/or expertise from Marie Hélène Shune, Alex Shire
New effort required? No

New proton samples in PIDCalib

Other comments  
Task name New Proton samples in PIDCalib
Lead (tools, or other) group PID
Other relevant groups (if any)  
Task description Add in PIDCalib proton samples from Λ_c decays (Existing coverage of Λ-> p pi samples has poor kinematic overlap with heavy physics decays)
Estimated total effort required (FTE) 0.3 FTE for 4 months.
Start of working Yes, Jan 2014
Deadline ASAP
People/groups currently involved Stephen Ogilvy, Sneha Malde
Past studies and/or expertise from Mika Vesterinen, Laurence Carlson
New effort required? No

Repository of PIDCalib data set

Other comments It seems that the best solution is to stored the files on EOS, at CERN. Philippe is currently creating the storage element in DIRAC, and Joel will create a dirac group for PID calibration.
Task name Disk space
Lead (tools, or other) group PID
Other relevant groups (if any) Computing
Task description Find a stable destination of the PIDCalib data sets; present version uses /castor area of the user who produced the sample
Estimated total effort required (FTE) N.A.
Start of working Yes, Feb 2014
Deadline ASAP
People/groups currently involved Sneha Malde
Past studies and/or expertise from Ben Couturier
New effort required? No

Prepare for 25 ns

Task name Prepare for 25 ns
Lead (tools, or other) group Tracking and alignment
Other relevant groups (if any) Everybody
Task description Track reconstruction needs to be tested with spillover. Run simulations. Estimate ghost rate (from spillover) and try to reduce it.
Estimated total effort required (FTE) 0.5 FTE for 12 months.
Deadline Summer 2014
People/groups currently involved  
Past studies from Jeroen Van Tilburg.
New effort required? Yes.
Other comments Work in collaboration with detector experts

Investigate problems in track fit 1

Other comments  
Task name Investigate problems in track fit
Lead (tools, or other) group Tracking and alignment
Other relevant groups (if any) Everybody
Task description Pulls and chi2 from track fit are not perfect. Especially the TT region looks bad. Already seen in MC.
Estimated total effort required (FTE) 0.4 FTE for 4 months.
Deadline before 2014 reprocessing.
People/groups currently involved Adam Davis.
Past studies from Wouter Hulsbergen.
New effort required? Yes. Adam will continue this works, but more manpower is needed.

Investigate problems in track fit 2

Other comments  
Task name Investigate problems in track fit
Lead (tools, or other) group Tracking and alignment
Other relevant groups (if any) Everybody
Task description Pulls and chi2 from track fit are not perfect. Especially the TT region looks bad. Already seen in MC.
Estimated total effort required (FTE) 0.4 FTE for 4 months.
Deadline before 2014 reprocessing.
People/groups currently involved Adam Davis.
Past studies from Wouter Hulsbergen.
New effort required? Yes. Adam will continue this works, but more manpower is needed.

Investigate problems in track fit 3

Task name Investigate problems in track fit
Lead (tools, or other) group Tracking and alignment
Other relevant groups (if any) Everybody
Task description Pulls and chi2 from track fit are not perfect. Especially the TT region looks bad. Already seen in MC.
Estimated total effort required (FTE) 0.4 FTE for 4 months.
Deadline before 2014 reprocessing.
People/groups currently involved Adam Davis.
Past studies from Wouter Hulsbergen.
New effort required? Yes. Adam will continue this works, but more manpower is needed.
Other comments  
Link ANN PID returning for Reco14 data

Review of HLT Tracking

See HLT Tasks

Available

Taken

The following tasks have been taken. Contribution is always welcome, but it's better to focus on the ones still free.

Completed

The following tasks have been already completed. Further effort is still needed for creating a package to automatize as much as possible the task and document it.

Meetings

Link to the Indico category (in the past only MuonID group tag the meeting using Particle Identification category)

Muon Identification

This page provides information on Muon Identification efficiency (instead of writing me email!). Results from both collision data and MC together with some tricks about the usage are available. Questions or comments concerning the code may be sent to barbara.sciascia@cernNOSPAMPLEASE.ch.

This Sandbox is %WEB%

This BarbaraSciasciaSandbox is %TOPIC%

This https://twiki.cern.ch/twiki/pub/Sandbox/BarbaraSciasciaSandbox/ForBenoit_May2012.txt is %ATTACHURL%/ForBenoit_May2012.txt

This BarbaraSciasciaSandbox is %USERSWEB%.BarbaraSciasciaSandbox

LinkAdAltreCose : per creare una sotto pagina della mia, se scrivo una wiki-parola e poi salvo, cliccando si apre la pagina relativa; scrivere e salvare crea di fatto la nuova pagina

Samples

All the muonID results have been obtained analyzing the following stripping lines:

JpsiFromBnoPIDnoMIP called 2B (for 2-bodies) spans high part of (p,pT) of muon spectrum

JpsiKFromBnoPIDnoMIP called 3B (for 3-bodies) spans a lower part of (p,pT) of muon spectrum The two samples with the high 1 fb-1 2011 statistics, allow to declare obsolete and cancel the use of 1D approach.

To Trigger Unbias

Measured quantities

Efficiency (isMuon flag)

At the end some figures will be useful. Let's try again Latex include directly with pdf files

Effi p Data11 12.pdf
E vediamo di metterle ste figure

Foto2095.jpg
Si continua a provare

Methods

Refer to the muID internal note (LHCb_045)

Two ways for having external link! Write the plain link http://google.com or create a local name to link at the same web site Googolando

Trigger Unbias

TIS-probe and TOS-tag

For trigger unbias stuff some formulas can help! Let's try Latex: $\int_{-\infty}^\infty e^{-\alpha x^2} dx $

This is more evoluted:

   $\int_{-\infty}^\infty e^{-\alpha x^2} dx$  (1)

To refer to some equation along the page I can use this expression %REFLATEX{eqn:eq1}% which gives me this (?? REFLATEX{} not defined in eqn list ??).

More can be learned here LHCb Trigger page

MuonIDfunctions

The following table lists the example scripts included in the package and what purpose they serve.

File Function
ForBenoit.txt A good example of table with data/MC and data efficiencies correction

L C R
A2 B2 C2
A3 B3 C3
multi span
A5-7 5 5
six six
seven seven
split over 3 lines
A9 B9 C9

Mock up of PID samples for EM - Feb 2015

Using the number of calibration events collected for each PID sample in Run1, define a Run2-equivalent sample. Specifically: from 2012 data, count the number of tracks on each sample, divide by 2000 (2 fb-1), obtain the number of calibration tracks per pb-1 after ALL selection, and finally, multiply by 2 for roughly taking into account the 8 TeV --> 13 TeV energy increase.

In the table below is indicated, for each particle and for each magnet polarity, the run interval that corresponds of the number of calibration tracks expected in 1 pb-1 of Run2. (Use the min/max Run syntax to produce the efficiency table from the selected interval: python MakePerfHistsRunRange.py  —minRun=117846 —maxRun=117848)

Particle Down Up
Min Max Min Max
Muon 117846 117848 125962 125965
Kaon/Pion 126915 126933 125951 (just one run)
Proton 117849 117851 120241 120317

MuonID Performance Plots

Tag me!! -- BS - 24 May 2012

MyMuonLink

SempreInfo

ProviamoAvedere

  • snowman:
    Foto2155.jpg

  • snowman:
    Foto2155.jpg
Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf Effi_p_Data11_12.pdf r1 manage 14.9 K 2012-05-24 - 12:59 BarbaraSciascia  
Texttxt ForBenoit_May2012.txt r1 manage 30.6 K 2012-05-23 - 14:48 BarbaraSciascia Different muonID corrections prepared for Benoit Viaud
JPEGjpg Foto2095.jpg r1 manage 433.4 K 2012-05-24 - 13:16 BarbaraSciascia  
PDFpdf PID_Run2samples_barbara.pdf r1 manage 1630.9 K 2015-05-20 - 12:18 BarbaraSciascia  
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Topic revision: r31 - 2015-05-20 - BarbaraSciascia
 
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