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The first look at sagitta resolution vs momentum (F. Cerutti –E. Meoni –S. Rosati - A. Policicchio- S. Ventura). First measure of sagitta resolution on barrel and beam momentum for a data set Operating conditions: Energy beam 250 GeV, MDT Main Ths -40mV- - PowerPoint PPT Presentation
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The first look at sagitta resolution vs momentum
(F. Cerutti –E. Meoni –S. Rosati - A. Policicchio- S. Ventura)First measure of sagitta resolution on barrel and beam momentum for a data set
Operating conditions: Energy beam 250 GeV, MDT Main Ths -40mV- Trigger 10X10 –
BIL Rot ON/OFF- Magnet current 0A/600 A
Run number: 600681(73Kevt) – 600682(97Kevt) – 600722(30Kevt)-600723(50Kevt)- 600724(32Kevt)- 600725(71 Kevt)
In particular: 600724 MBPL magnet at 600A BIL rotation OFF (P and sagitta measur.)600725 MBPL magnet at 0A BIL rotation OFF (Alignment BIL rot. vs. Barrel )
T0 fitsBIL rot ml=1 mezzanine=2BIL2 ml=2 mezzanine=2
BML2 ml=2 mezzanine=2 BOL2 ml=2 mezzanine=3
T0 fits computed grouping TDC spectra of channels inthe same mezzanine
Fermi-Dirac distribution
Applied a cut on ADC counts:accepted hits withADC > 45
Residual Distributions
BIL rot ml=1 BOL2 ml=2
mm
mmmmmm
R-T relation produced by Rome3 with calib for the run 600379:BIL Rot ON, ± 10degree, 18 June.(for drift distences smaller than 2mm used a linear r-t relation)
Events reconstructed with athena 8.5.0
Systematic error at level of 50m related to temperatureeffects and t0 effects
mm
mm
BIL2 ml=1 mm
mm
Barrel sagitta
mm
BOL
BML
BIL
Selected track segments in the jura-side chambers (most illuminated)
Sigma 68 m
Beam Profile on RPC phi-strips
BML2 rdoublr=1 BML2 rdoublr=2
We select the most illuminated phi-strips: at least one hit in this strip for RPC rdoublr=1 (behind the MDT)and one for RPC rdoublr=2 (beyond the MDT) in BML station.
P measurement B(600A) B(0A)
Momentum
GeV
)0,()600,()(3.0)(
ABABTmBLGeVP
entbilrotsegmentbarrelsegm
Mean=233 GeVSigma=15 GeV
BL=3.54 Tm
Sagitta Distribution (RPC cuts + Pcut)
ooo XxXxp ln0038.01MeV6.13 osm ZZ
ZZZZS tan13
2312..
Multiple scattering contribute to sagitta resolution:
For p=233 GeV (Sms)=29 m
Sigma 63 m
P > 215 GeV
mSSS msmeasi 56)()()( 22
mm
Final observation…
Phi-strip position (mm)
Sagi
tta(
m)
The mean value of the sagitta has a maximum spread of 2.5 m on four phi-strip (the most illuminated ones) …….we can remove RPC cuts onour study
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