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~, ~ , ~ , ~~, ~
~ ~
l χ χ χ
χ χ
1 10
20
1 20
±
±→ +q g
pp X
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0DMRU�EDFNJURXQGV�:�MHWV��=�MHWV��:=�«�:=�EDFNJURXQG�LV�LUUHGXFLEOH�
.H\�WR�VXFFHVV�ODUJH�DFFHSWDQFHV�DQG�KLJKHIILFLHQFLHV�IRU�KLJK�DQG�ORZ�S7
OHSWRQV�LQFOXGLQJ�WKH�WDX�OHSWRQ
CPS
EM
~G
γZvtx resolution, Run II
0
250
500
750
1000
1250
1500
1750
2000
-10 -8 -6 -4 -2 0 2 4 6 8 10
436.2 / 193Constant 1812. 7.347Mean -0.7222E-02 0.6948E-02Sigma 2.192 0.5494E-02
a)
Impact parameter, Run II
0
500
1000
1500
2000
2500
3000
-10 -8 -6 -4 -2 0 2 4 6 8 10
700.7 / 195Constant 2882. 11.58Mean 0.2570E-02 0.4352E-02Sigma 1.368 0.3325E-02
b)
0.1mm 1mm 1cm 10cm 1m 10m
Hot cellγ τc
Photons as we know Impact
parameter
~ ~χ γ10 → G
σ rz = 2 2. cm
σ φr = 1.4 cm
/RQJ�OLYHG�1HXWUDOLQR7KH�XSJUDGHG�'��GHWHFWRU�ZLOO�HQDEOHXV�WR�LGHQWLI\�QRQ�YHUWH[�SRLQWLQJ�SKRWRQVE\�PDWFKLQJ�FOXVWHUV�LQ�WKH�(0�FDORULPHWHUDQG�SUHVKRZHU�GHWHFWRUV
3URYLGLQJ�XQLTXH�WRROV�LQ�VHDUFKLQJIRU�ORQJ�OLYHG�QHXWUDOLQRV
10-4
10-3
10-2
10-1
1
10
10 2
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Particle β
Effic
ien
cy, %
Heavy Slow Moving Particle
MIP
0.1mm 1mm 1cm 10cm 1m 10m~ ~l l→ G
SMT CFT CALTracks as we know Kinks Large dE/dx
7RROV�IRU�PDVVLYH�VWDEOH�FKDUJHG�SDUWLFOHV��063�
G(�G[�LQIRUPDWLRQ�IURP���6LOLFRQ���)LEHU�WUDFNHU���3UHVKRZHUV���&DORULPHWHU
$Q�HIILFLHQF\�RI�����IRU�063�DQGD�UHMHFWLRQ�IDFWRU�RI�����IRU�0,3�DUH�DVVXPHG0
500
1000
1500
2000
2500
3000
x 102
0 20 40 60 80 100 120ADC counts
Eve
nts
68% 95% 99%
SMT
/RQJ�OLYHG�6OHSWRQ
6XPPDU\
:H�KDYH�FDUULHG�RXW�H[WHQVLYH�VHDUFKHV�IRU�SK\VLFV�EH\RQG�VWDQGDUG�PRGHO�LQ�5XQ�,�1RWKLQJ�DJDLQVW�RU�IRU�VXSHUV\PPHWU\ KDV�EHHQ�IRXQG�
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