BES Ⅲ Detector Description and Event Display Zhengyun YOU, Yajun Mao School of Physics, Peking University Jan.10th, 2006

Outline What is XML; BES Ⅲ Detector Description based on XML(GDML); What is Detector Description; Why we need Event Display; BES Ⅲ Event Display Software -- BesVis; Highlights in BesVis; Part Ⅰ Part Ⅱ

Part Ⅰ Detector Description

Detector Description in BESIII Offline Software GEANT4GAUDIROOT BOOST BOSS Detector related information geometry, material, structure… Event Generator Detector Simulation Reconstruction Physics Analysis Event Display

 XML (eXtensible Markup Language) is an industry standard tool.  XML has great power in auto-distribution and data exchange over platforms. XML document Same content Different format standard auto What’s XML?

A Simple Example With XML <volume name=“logLayer” solid=“layer” material=“iron” airiron

BES Ⅲ Detector Mdc Tof Emc Muc Others Magnet, Beam Pipe...

BES Ⅲ Sub-detectors by XML Mdc (18,324 Nodes) Muc (16,071 Nodes) Emc (12,806 Nodes) Tof (643 Nodes)

BES Ⅲ Detector Description based on GDML Geometry, Materials, Alignment… Classes for Simulation GDML description Classes for Reconstruction Classes for Event Display ROOT Schema GDML writer GEANT4 Schema  GDML (Geometry Description Markup Language) is a kind of XML, developed by GEANT4 group.  We expand its GEANT4 Schema and developed a new ROOT Schema for BES Ⅲ applications. Automatically

XML document Advantage of Using XML GDML description Simulation Reconstruction Event Display 1. Single source for all applications 3. Data exchange over platforms 2. Auto distribution

Part Ⅰ Summary Next stage will focus on Reconstruction in other sub-detectors and alignment; XML Detector Description has been well used in simulation, event display of all sub-detectors and Muc reconstruction;

Part Ⅱ Event Display

Visual check of sub-detectors Visual check of hits, tracks Improve recon. eff., ghost, mis-ID Propaganda Visual check of hits-track association Why we need Event Display

Object Oriented, C++, based on ROOT and GDML, independent of BOSS; Start from Oct, 2005; First version released; Developed by Peking University; BES Ⅲ Event Display Software -- BesVis

BesVis – Friendly User Interface

BesVis – Display Mode XY + ZR XY ZR 3D All

BesVis – Details Control

BesVis – OpenGL and X3D OpenGL X3D

BesVis – Lots of Functions Event Detector View Control Hot Keys User favorite style Dst

BesVis – Highlights ( Ⅰ ) XML Detector Description : from XML : consistent; from ROOT : fast; A new BES Ⅲ Event Display software, based on investigation of many other experiments : ZEUS, CDF, PHENIX, ATLAS(Fast), Babar, STAR, CMS, LHCb, CLEO, BESII … Newly developed 2D geometry system : + = New nice style :

BesVis – Highlights ( Ⅱ ) -- Interactive

BesVis – Highlights ( Ⅲ ) -- Animation J/Ψ-> μ + μ -

Part Ⅱ Summary New functions to be added : Display of MC truth; Event selection and save; …… Event Display Software has basic functions and could be used;

Thank you!

BES Ⅲ Sub-detectors by XML Mdc (18,324 Nodes) Muc (16,071 Nodes) Emc (12,806 Nodes) Tof (643 Nodes)

BesVis – Highlights ( Ⅲ ) -- Animation J/Ψ-> μ + μ -