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Kaon identification

Here I discuss the issues specific to kaon identification. Table  4.9 summarizes the conditions necessary to identify a track as a pion, in addition to those necessary to validate a track, described in section  4.3.

Table 4.9: Summary of conditions used to identify a track as a $K$ (PID cuts). The ``$8K^+$high'' setting was split in two because of different hodoscope calibrations. The $a$ and $b$ parameters are used to specify a slat-dependent hodoscope cut: $H3TOF < H3SLAT\times a + b$, where $H3TOF$ is time-of-flight, $H3SLAT$ is the slat number. The fields are left blank when a device was not used to apply a cut for the $\pi$ identification.

setting	$C1$	$C2$	H3		H2		$p_y, GeV/c$
			a	b	a	b
$4K^-$low	$\le$70	$\le$60	.1	10	0.	10	$[0.002,0.009]$
$4K^-$high	$\le$77	$\le$74	.1	10	.083	7
$4K^+$low	$\le$75	$\le$65	.1	10			$[0.002,0.009]$
$4K^+$high	$\le$77	$\le$74	.1	10
$8K^-$low		$\le$59	.067	1.5			$[0.006,0.01]$
$8K^-$high		$\le$63	.05	2.
$8K^+$low		$\le$59	.067	1.5			$[0.006,0.012]$
$8K^+$high : $K$ calibr		$\le$66	.06	1.
$8K^+$high : $p$ calibr		$\le$66	-.06	-1.5

Table 4.10: Corrections to the $K$ yields related to the process of particle identification for the samples of top 10% and top 4% centrality.

setting	Cherenkov veto correction		H3 TOF
	10%	4%
$4K^-$low	2.2 $\pm$ 0.7	3.1 $\pm$ 0.8	N/A
$4K^-$high	1.46$\pm$ 0.05	1.56$\pm$ 0.09	N/A
$4K^+$low	2.61$\pm$ 0.21	2.91$\pm$ 0.34	N/A
$4K^+$high	1.22$\pm$ 0.04	1.20$\pm$ 0.05	N/A
$8K^-$low	2.08$\pm$ 0.16	2.4 $\pm$ 0.6	1.056
$8K^-$high	1.10$\pm$ 0.04	1.09$\pm$ 0.04	1.016
$8K^+$low	2.15$\pm$ 0.12	2.4 $\pm$ 0.4	1.086
$8K^+$high	1.12$\pm$ 0.01	1.15$\pm$ 0.05	1.0028