Download 2016_09_BESIII

Status of Offline Software
Ziyan Deng
On behalf of the offline software working group
2016-09 BESIII Physics and Software Workshop, IHEP
Software releases
 BOSS7.0.0 released last Dec. for data taking this year
Used for offline calibration and fast reconstruction
 BOSS7.0.1 released in July
MRPC updates, dE/dx improvements, other bug fixes
~ 1/fb data reconstructed before Mar. 25, machine study
(requested by the Charm group for CHARM16)
Tested by CHARM group, see Hajime and Shuai’s talks
No MC tuning, please do not use it to produce MC
Release plan
 BOSS7.0.2 will be released at the end of September
MRPC updates (Shengsen) and MC tuning (Fenfen)
EMC improvements (Chunxiu)
Generators (Ronggang, Hajime)
 New calibration constants are ready
dE/dx calibration constants (Jinfa, Jake, Kai)
new MRPC calibration constants (Shengsen)
new MUC calibration constants(Lianjin)
 New MC tuning constants are ready
dE/dx (Jinfa, Jake, Kai)
MRPC (Fenfen)
time-consuming task
TOF Reconstruction and Calibration
 The calibration of the difference between four collisions in
one trigger cycle is added into TOF calibration algorithm.
 The average of measured times of two ends is used as
combined measured time of one strip instead of 7-term
calibration formula’s result.
 The calibration of data of 2016 have been finished and will be
used in next boss release 7.0.2.
Boss701
60ps
Boss701a
57ps
Benefit from the decrease of bunch
length, best time resolution of
endcap TOF achieved as 51ps.
MRPC Simulation Status
 The new digitization method has been established
for MRPC simulation. MRPC simulation package and
calibration constants are ready for new BOSS Release
 MC tuning method has been investigated. After
tuning, Bhabha events shows good consistency of
time resolution and efficiency between data and MC
(<1% in most aspects)
 Hadron samples are expected for further tuning
MRPC Efficiency of MC & Data
BesEvtGen
• Phokhara is available in BesEvtGen, based on its fortran version 7.0
Table: List of hadronic phokhara modes and their models in BesEvtGen
• How to use PHOKHARA model in BesEvtGen, e.g.
noPhotos
Particle vpho 3.65 0
Decay vpho
1 PHOKHARA_pipi;
Enddecay
End
Note
• noPhotos: FSR has been considered in PHOKHARA, so switch off this option
• “Particle” define the Ecms=3.65 GeV.
• Cite model in the form: BranchingFraction followed by the model name
PHOKHARA_pipi.
BesEvtGen
• ConExc model is updated
 allow user to generate the light hadron events for R-value measurement
with PHOKHARA modes
 allow user to generate muti-mode decays, e.g. open charm decays.
• Parameters of Lund Area Low model above DD-bar threshold are optimized and
fixed in this version
• ConExc model is ready for the 4.18 GeV MC production , see Hajime’s talk.
Update of TOF energy [email protected]
• TOF energy calibConst：CTOF=energy_exp/Q by
using dimu events.
• For data, TOF Q will change because of scintillator
aging or adjusting high-voltage
• For MC , TOF Q will change with the different
TofSimConst in the different run-regions.
• So @Boss7.0.1, update TOF energy calibrations
which are different for the different run-regions.
Update of EMC shower energy correction
 The update of TOF energy calibration @Boss7.0.1
certainly causes the change of TOF energy
reconstruction.
 EMC shower energy correction is based on (E5x5+
TOF energy) .
 So, need to update the parameters of EMC shower
energy correction.
EMC Shower Energy correction
• Update MC correction by using MC single  with 53 energy points
from 20MeV to 2.3GeV
EmcRec  Dst  AbsCor  Ana
two cases:
MC single 
(1) E  =(E5x5/cor)/pi0cor
(2) E  =(E5x5+etof) /cor/pi0cor
For MC pi0cor=1;
For data pi0cor obtained by pi0
Calibration
Eshower/Ein versus Ein
p0 calibration for data
• To calibrate the data pi0 peak to MC peak.
• Update the pi0 correction function: lnEcor = a0 + a1  lnE + a2  ln2E + a3ln3E
@7.0.1.a
NouseTofenergy
@7.0.1.a
useTofenergy
EMC shower energy correction are updated @7.0.1.a
p0 mass and resolution versus p0 momentum @7.0.1.a
No
4cfit
4c
fit
p0 mass
p0 mass
4c
fit
No
4cfit
p0 Mass
resolution
p0 Mass
resolution
• In the different p0
momentum
region, data and
MC of p0 mass
and resolution
are consistent.
• The 
reconstruction
efficiency still
need to study.
Muon calibration
nHits
Calibration with Dimu data from June 2016
The box efficiency and noise level of MUC are similar as before.
Muon calibration
— Spatial resolution for Barrel is about 28.1 mm.
— Spatial resolution for Endcap is about 33.7 mm.
Spatial resolution for Barrel and spatial resolution for Endcap are similar as before.
dE/dx
 New calibration and MC tuning constants are ready
• For this year’s 4.18 GeV data, will be released with BOSS 7.0.2.
data
MC
Similar qualities as before.
 In progress (see Meng’s talk for details)
• Work in MC simulation to improve Data/MC consistency.
Hopefully to appear in next release.
Data production plan
 All data taken this year will be fully reconstructed with
BOSS7.0.2
From Oct. 1st to Oct. 15
 MC data production with BOSS7.0.2
Charm group will use reconstructed data to
re-calibrate the beam energy, it’s better to
generate MC samples when it’s done.
Software work in progress
 dE/dx simulation (Meng, Guang, Kai)
Data/MC consistency will be improved
Hopefully to appear in next release
 Hough tracking (Jin, Yao)
Focus on low momentum tracks
Need more checks on real data
 CGEM software (Liangliang, Linghui, Lia)
Geometry updates
Digitization based on test beam results
Summary
 7.0.2 will be released soon
• Phokhara is available in BesEvtGen
• TOF calibration updated, and the calibration of data of
2016 have been finished and will be used in next BOSS
release 7.0.2
• EMC shower energy correction updated
• MUC calibration constants updated for new data, no
obvious change for MUC performance
• dE/dx calibration and MC tuning constants are ready
 All data taken this year will be reconstructed with
7.0.2
7.0.2
 The new release is being tested, some data
reconstructed and some MC samples generated
 The software group are checking the release at the
low level
 The Charm group are comparing data and MC,
different generators signal yields, etc.
 Hopefully the new version will be released as
expected (at the end of September),if no severe
problem is found