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Technique for event-by-event multiparticle texture analysis using the NA44 Si pad array

This chapter describes analysis procedures performed to obtain physically meaningful results from the Si pad array (hereafter referred to as the detector) measurements. Motivations for such measurements are outlined in the Introduction. A description of the detector's design and principle of operation, as well as of the experimental setting, is given in Chapter  3. The analysis required solutions to the following problems:

• channel-by-channel amplitude calibration (Section  6.3),
• determination of the detector's geometrical position with respect to the beam's center of gravity (Section  6.4),
• study of cross-talk between the channels (Section  6.5),
• construction of an observable sensitive to the possible manifestations of the physics we are interested in (Section  6.6),
• analysis of background effects and a technique of their subtraction (Section  6.7),
• a Monte-Carlo simulation of the detector's response to model-generated events based on the detailed understanding of the above-mentioned detector effects (Section  6.8),
• analysis of the observable's response/sensitivity to the interesting effects, based on the MC simulation (Sections  7.2 and  7.3).

Table 6.1: Data used in the Si analysis.

Run	sign	target	trigger	events	events
number				on tape	after cuts
3155	$-$	Pb	$VB$	42650	42408
3191	$-$	Pb	$VB$	39312	38905
3192	$-$	Pb	$VB.T0$	39924	36334
3156	$-$	empty	$VB$	35280	35020
3190	$-$	empty	$VB.MUL1$	7979	4831
3200	$-$	empty	$VB.MUL1.\bar{C1}.\bar{C2}$	2027	1412
3157	$+$	empty	$VB$	40275	40078
3187	$+$	empty	$VB.\bar{C1}.\bar{C2}$	6454	4141
3188	$+$	empty	$VB$	38208	37901