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m+: Status, first results and outlook
Peter Winter
m+ / m- discrimination
eLog:92 TrendPlotViewer
TPC
m- m+
c2
m+ / m- discrimination
m+ magnet setting
• Data sets have to be sorted by magnet:
polarity | Run 11-----------------------------------------+125 A | 1220 (3.7 108)- 125 A | 3500 (9 108) 0 A | 840
eLog:189
m+ magnet setting
• Data sets have to be sorted by magnet:
polarity | Run 11-----------------------------------------+125 A | 1220 (3.7 108)- 125 A | 3500 (9 108) 0 A | 840
• But can we prove the database entries?
eLog:189
m+ magnet setting
m+ magnet + m+ magnet -
m+ classification
• Tools to discriminate m+ / m- and magnet polarity available
• Might need some more refinement
• Needs to be simply done carefully for final production
m+ fitting summary
N(t) = N0 l w exp(-lt) [1 + A P(t) sin(wt+f)] + B
m+ fitting summary
N(t) = N0 l w exp(-lt) [1 + A P(t) sin(wt+f)] + B
P(t) = exp(-lmsr2 t2/2)
P(t) = exp(-lmsr t)
m+ fitting summary
N(t) = N0 l w exp(-lt) [1 + A P(t) sin(wt+f)] + B
P(t) = exp(-lmsr2 t2/2)
m+ fitting summary
N(t) = N0 l w exp(-lt) [1 + A P(t) sin(wt+f)] + B
P(t) = exp(-lmsr2 t2/2)
1. Initialize muSR parameters A, w, f, lmsr from difference histograms
m+ fitting summary
N(t) = N0 l w exp(-lt) [1 + A P(t) sin(wt+f)] + B
P(t) = exp(-lmsr2 t2/2)
1. Initialize muSR parameters A, w, f, lmsr from difference histograms
2. Fix muSR parameters A, w, f, lmsr and fit lifetime parameters N0, l, B
m+ fitting summary
N(t) = N0 l w exp(-lt) [1 + A P(t) sin(wt+f)] + B
P(t) = exp(-lmsr2 t2/2)
1. Initialize muSR parameters A, w, f, lmsr from difference histograms
2. Fix muSR parameters A, w, f, lmsr and fit lifetime parameters N0, l, B
3. Release A, w, f one by one and fit again.
m+ fit results:
m+ fit results:
eLog:198
l versus Gondola scan
&
l versus nContEH scan
m+ fit: Gondola scan (+125A)
m+ fit: Gondola scan (-125A)
m+ fit: nContEH scan (+125A)
m+ fit: nContEH scan (-125A)
m+ fit results:
eLog:213
l versus TPC bin
1 2 3 4
5 6 7 8
9 10 11 12
21 22 23 24
eLog:214
m+ fit: TPC volume scan (+125A)
m+ fit: nContEH scan (-125A)
Scatter estimate: DR(m- - m+) [ppm]
Scatter effect estimate: eLog:233
Scatter estimate: DR(m- - m+) [ppm]
+125 A, y>0
-125 A, y>0
-125 A, y<0
+125 A,y<0
?
Scatter estimate: DR(m- - m+) [ppm]
+125 A, y>0
-125 A, y>0
-125 A, y<0
+125 A, y<0
DR( S 4 data sets) = 471 382 ppm
Scatter estimate: DR(m- - m+) [ppm]
+125 A, y>0
-125 A, y<0
+125 A, y<0
DR( S 4 data sets) = 471 382 ppm
DR( S 3 data sets) = 2619 373 ppm
Scatter estimate: Dl [ppm]
DR( S 4 data sets) = 471 382 ppm
DR( S 3 data sets) = 2619 373 ppm
= Dl DR * e
e = fraction of nContEH=1 = 0.0135
Dl( S 4 data sets) = 6.4 5 s-1
Dl( S 3 data sets) = 35 5 s-1
m+ / m-: Conclusion
• Effect sizeable but lots of work still needed• Differences in nContEH(y) distribution• Study more differential (y, ...)• Differences in dE/dx might affect nContEH?
• mu+ inconsistencies need to be resolved:• mu+ datasets +125A and -125A differ• mu+ fits don't converge all the time
