mass (gev/czimmer.csufresno.edu/~yogao/conf-talk/dpf00.pdf · 2007. 8. 15. · raf helium reservoir...
TRANSCRIPT
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01 234 56
7 89 :; <= > 8? 9 @
7 ;A BCD E BF =G H I J KLNM HOP QRS M HOP <= > J KLUT H
7 :A <V WXY F V >Z VA W E [\ ]Z F D < EZ F = Z =G ^ I J KL M ^ <= >G ^ I L _a` b cM ^
7 @d BA V ] < EZ F = FY G I J KLe M P fRM
7 : E C > g FY Q RS P Q Rh i V F > C W EZ F = Z =G >A W < g B
7 jA < BC VA kA = E FY l mon K l H Hqp r sat _au b c IG mG n v K r sat _au b c IG HG H v
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9.44 9.46
Mass (GeV/c2)
0
5
10
15
20
25
σ (e
+ e- → H
adro
ns)(n
b) ϒ(1S)
10.00 10.020
5
10
15
20
25
ϒ(2S)
10.34 10.370
5
10
15
20
25
ϒ(3S)
10.54 10.58 10.620
5
10
15
20
25
ϒ(4S)
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Helium Reservoir
Muon Chambers
Magnet Yoke
Superconducting CoilBarrel Shower DetectorDrift Chamber
Micro-Beta QuadrupoleVertex DetectorEnd Cap Time of FlightPole Tip Shower DetectorTime of Flight Scintillators
SVX Detector
0 1 2 3 4
Meters
raf
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� 0 � � � �� � � :� � � � � � � � �
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� 0 � � �� ) � �
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� j < g <D D F � VA BF D C EZ F = FY EXA <= > � T < k d Z � C Z E g
� � V F B B k <= <= > � C Z = = P XA i � i X �� �� �� �
; <=>? @ABC >D ? EFC GH? ? B IJK L MC G NAD = G NO ? C PQC RB D = E GS =B D C < H AB T GH U= EA HB @
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2030300-004
400
600
800
1000
1200
250
500
750
1000
1250
1500
000 03030 20 10 10 20 20101020
200
Can
did
ates
/ 0.
5
I I
J/ + IJ/ + Iee
[M( + I) IMJ/
] / (M)[M(e+( )e ( ))I IMJ/
] / (M)
II II
( a ) ( b )
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Z = ] <V Z <= E k < B B W <D W CD < EZ F =
� _ J KL I � m �n c Z = WVA < BA Bd g `� � � Z EX F C E < > > Z = � k F VA d < W� � V F C = >
; <=>? @ABC >D ? EFC GH? ? B IJK L MC G NAD = G NO ? C PQC RB D = E GS =B D C < H AB T GH U= EA HB @
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5.20
0
50
0.2
0
0.2
0.4
0.4
0
0.2
0.2
5
0.4
0
0.2
0
0.1
5.28
2
0.1
5.240
0.1
5.20
2
0.2
5.28
0
0.1
5.24
0
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( c ) ( d )
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E (G
eV)
2030300-005
Beam - Constrained B mass (GeV/c2)
0KsC
and.
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MeV
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; <=>? @ABC >D ? EFC GH? ? B IJK L MC G NAD = G NO ? C PQC RB D = E GS =B D C < H AB T GH U= EA HB @
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G H I J KL M H �� � �� � �� �
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100
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05.20
25
20
15
10
20
40
60
5.305.285.265.245.225.205.305.285.265.245.22
5
0
Can
did
ates
/ (1
MeV
/c2 )
Beam - constrained B mass (GeV/c2)
+IB J / K+I +I(2S)KB
+I( a ) ( b )
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G ^ I J KL M ^ � � u `� � ` � � _� ��� � u � � c � _� �� � u � � � �� u c �
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5.225.000
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5.305.285.265.245.2205.20
40.10
0.05
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0.05
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5.305.285.265.24
III
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2031099-003
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( d )
( c )
( b )
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GeV
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MeV
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ate
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; <=>? @ABC >D ? EFC GH? ? B IJK L MC G NAD = G NO ? C PQC RB D = E GS =B D C < H AB T GH U= EA HB @
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