Yields: pi+ (after new replay of strange runs)

Log entry time 14:30:51 on July 8,2004

Entry number 475

keyword=Yields: pi+ (after new replay of strange runs)

After the adc gates check as described elsewhere (log entry #) and the new replay of the affected runs the pion yields were calculated again. The cuts used to obtain the number of pion events for a given run are as follows:



	abs(cointime)<1.0

	hcer_npe<2.

	haero_po+haero_ne>4.

	scer_npe>2.

	

	abs(hsdelta)<8.

	abs(hsxptar*166.37)<14

	abs(hsytar+166.37*hsyptar)<6.

	abs(ssdelta)<15.

	abs(ssxptar*166.37)<7.

	abs(ssytar+166.37*ssyptar)<10.

	ssxfp>-20

	ssxfp<22



	abs(missmass-0.93956533)<0.04 (0.10 for LD2)

The yields are random corrected by subtracting the average of three random not in time peaks from the coincidence time spectrum.

The errors on the yields are calculated using standard error propagation: Denote the number of real counts and background counts by N_r and N_b respectively.



	N_tot = N_r - (1/3)*N_b



	sigma_tot = sqrt(N_r2 + (1/3)^**2 * N_b)

The runs are divided into the respective kinematic settings which are listed below, where pp=pi+, pm=pi-, c=central, r=right,l=left.



Q2    E   thSOS   pSOS   thHMS  pHMS    Runnums (pi+)   Target   Kin



2.45  4   51.48   0.771  10.55  3.336   47055-47089      LH2    central

                         10.55  3.336   47090-47118      LD2

                         10.55  3.336   47088-47089      Dummy

                         12.20  3.336   47120-47154      LH2    right

                         12.20  3.336   47120-47158      LD2  

                         12.20  3.336   47155-47157      Dummy  

    

2.45  5   29.43   1.74   13.61  3.336   47358-47371      LH2    central

                         13.61  3.336   47375-47388      LD2

                         13.61  3.336   47372-47374      Dummy 

                         16.61  3.336   47393-47405      LH2    right

                         16.61  3.336   47410-47418      LD2

                         16.61  3.336   47407-47408      Dummy

                         10.61  3.336   47419-47428      LH2    left

                         10.61  3.336   47431-47451      LD2

                         10.61  3.336   47452-47453      Dummy





1.60  3   43.10   0.786  10.50  2.931   47587-47603      LH3    central 

                         10.50  2.931   47598-47599      Dummy

                         12.54  2.931   47605-47613      LH3    right

                         12.54  2.931   47614-47615      Dummy    



1.60  4   25.74   1.65   13.29  2.931   47687-47691      LH4    central

                         13.29  2.931   47693            Dummy

                         16.29  2.931   47695-47702      LH4    right

                         16.29  2.931   47702            Dummy

                         10.55  2.931   47725-4778       LH4    left

                         10.55  2.931   47737-47738      Dummy

Even after the new replay a few runs remain to be investigated further.



47112

47113

Fig 1: Yields pi+ (after new replay)

pi+

User name horn

Log entry time 14:30:51 on July 8,2004

Entry number 475