QUTRWT

Introduction

All ALEPH events are triggered by one or more trigger. The names and definitions of these trigger bits changes with time. Certain triggers are downscaled by the level 2 hardware. Certain other triggers are downscaled by the level 3 software. In order to analyse ALEPH data it is therefore necessary to reweight these downscaled events appropriately.This is what QUTRWT allows you to do.

Calling QUTRWT

The routine QUTRWT is called with 5 arguments:

CALL QUTRWT(IDEB2,AL2WT,IDEB3,AL3WT,TINT)

IDEB2	INPUT	Debug flag for level 2 routine QUL2WT
AL2WT	OUTPUT	Weight for event to allow for LEVEL 2
IDEB3	INPUT	Debug flag for level 3 routine QUL2WT
AL3WT	OUTPUT	Weight for event to allow for LEVEL 2
TINT	OUTPUT	Array of set bits in order of names - see below

The debug levels controlled by IDEB2 and IDEB3 are:

0	NONE
1	WARNINGS
2	INFORMATION
3	VERBOSE

The order of the named bits returned in TINT is:

SNG_N_EL	1	SNG_C_E2	2	TRK_CNT2	3	SNG_N_EC	4	DBL_C_E2	5	SNG_MUON	6
SNG_C_EM	7	LW_ET_HI	8	LW_A+BVH	9	ETT_EWEA	10	ETT_EWEB	11	ETT_EWE*	12
ETT_EWBA	13	RNDM_TST	14	SiCAL_ME	15	TAG_SNGC	16	RNDM_TRG	17	LW_LO_HI	18
LW_A+BLO	19	LCW_A_LO	20	LCW_B_LO	21	BCAL_TRG	22

Control CARDS

In addition the control cards NL3W, and NL2W disable level 3 and level 2 weight calculation. If they exist in the cards file read by the program then the corresponding weighting is not calculated, but TINT is always filled.

Source, and Example

The source of QUTRWT can be found here. The following is an example of calling QUTRWT.



      INTEGER TINT(32),IDEB2,IDEB3
      REAL AL2WT,AL3WT

       DATA IDEB2/3/,IDEB3/3/



       CALL  QUTRWT(IDEB2,AL2WT,IDEB3,AL3WT,TINT)


      CALL HFILL(1,X,Y,AL2WT*AL3WT)

Any problems should be addressed to the author Alex Finch .