Open Charm Production

Table 1: Overview of the measurements of open charm production at H1.

	Analysis	Data	Kinematic Region
			$Q^2$	$y$	$p_t^{D}$	$\eta^{D}$	Other cuts
			[GeV$^2$]		[GeV]
[2]	$D^*$ in $\gamma p$	1994	$<0.01$		$>2.5$	$-1.5...1.0$	$159<W_{\gamma p}<242$ GeV
			$<4$		$>2.5$	$-1.5...1.0$	$95<W_{\gamma p}<268$ GeV
[3]	$D^*$, $D^0$ in DIS	1994	$10...100$	0.01...0.7
[4]	$D^*$ DIS	94-96	2...100	0.05 ... 0.7	$>1.5$	$-1.5 ... 1.5$
	$D^*$ $\gamma p$		$<0.01$	$0.29 ... 0.62$	$>2.5$ GeV		$\vert\hat{y}(D^*)\vert<1.5$
			$<0.009$	$0.02 ... 0.32$	$>2.0$ GeV		$\vert\hat{y}(D^*)\vert<1.5$
[5]	$D^*$ DIS	96-97	$1...100$	$0.05 ... 0.7$	$>1.5$	$-1.5 ... 1.5$
	$F_2^c$		$1...100$	$0.05 ... 0.7$
[6]	$D$ DIS	99-00	$2 ... 100$	$0.05 ... 0.7$	$>2.5$	$-1.5 ... 1.5$	$E_{t,jet_{1(2)}}>4(3)$ GeV
							$-1<\eta_{jets}<2.5$
[8]	$D^*$ DIS + jets	99-00	$2 ... 100$	$0.05 ... 0.7$	$1.5...15$	$-1.5 ... 1.5$
[7]	$D^*$ in $\gamma p$	99-00	$<0.01$		$>2$	$-1.5 ... 1.5$	$171<W_{\gamma p}<256$ GeV
[9]	$D^*$ + jet in $\gamma p$	99-00	$<0.01$		$>2$	$-1.5 ... 1.5$	$171<W_{\gamma p}<256$ GeV
							$p_t^{jet}>3.0$ GeV
[47]	$D^*\mu$ $\gamma p$	97-00	$<1$	$0.05 ... 0.75$	$>1.5$	$-1.5 ... 1.5$	$p^\mu>2.0$ GeV
							$\vert\eta^\mu\vert<1.735$
[43]	$F_2^c$ high $Q^2$	99-00	$>150$	$0.1...0.7$
[46]	$F_2^c$ low $Q^2$	99-00	$2...120$	$0.1...0.7$
[45]	Charm jets $\gamma p$	99-00	$<1$	$0.15 ... 0.8$			$p_t^{jet_{1(2)}}>11(8)$ GeV
							$-0.88 < \eta_{jets} < 1.3$
[10]	$D^*$ in DIS	2000	$2 ... 100$	$0.05 ... 0.7$	$>1.5$	$-1.5 ... 1.5$	$p_{t,jet}^{D^*}>3$ GeV

Table 2: Overview of the measurements of open charm production at ZEUS.

	Analysis	Data	Kinematic Region
			$Q^2$	$y$	$p_t^{D}$	$\eta^{D}$	Other cuts
			[GeV$^2$]		[GeV]
[11]	$D^*$ $\gamma p$	1993	$<4$	$0.15 ... 0.84$	$>1.7$	$-1.5 ... 1.5$
[12]	$D^*$ in $\gamma p$	1994	$<4$	$0.15 ... 0.87$	$>3.0$	$-1.5...1.0$
[13]	$D^*$ in DIS	1994	$5 ... 100$	$<0.7$	$1.3 ... 9.0$	$-1.5 ... 1.5$
[14]	$D^*$ in $\gamma p$	96-97	$<1$	$0.19 ... 0.87$	$>2.0$	$-1.5 ... 1.5$
[38]	$c\rightarrow eX$ in DIS	95	$2.5...170$				$-4.1<\log(x)<-2.2$
	($dE/dx$)						$1.2<p_{track}<5.0$
							$0.65<\theta_{track} < 2.5$ rad
							$E_{em}/E_{tot} >0.9$
[37]	$c\rightarrow eX$ in DIS	96-97	$1...1000$	$0.03...0.7$			$1.2<p_{track}<5.0$
	($dE/dx$)						$0.65<\theta_{track} < 2.5$ rad
[15]	$D^*$ DIS, $K2\pi$	96-97	$1...600$	$0.02...0.7$	$1.5...15$	$-1.5 ... 1.5$
	$D^*$ DIS, $K4\pi$		$1...600$	$0.02...0.7$	$2.5...15$	$-1.5 ... 1.5$
[17]	$D^*$ dijets in $\gamma p$	96-00	$<1$		$>3.0$	$-1.5 ... 1.5$	$E_{t,jets}>5$ GeV
							$\vert\eta^{jets}\vert<2.4$
							$130<W_{\gamma p}<280$ GeV
							$M_{jj}>18\;$GeV
							$\vert\bar{\eta}\vert<0.7$
[16]	$D^*$ in DIS	98-00	$1.5 ...1000$	$0.02...0.7$	$1.5...15$	$-1.5 ... 1.5$
[23]	$D$ in DIS	98-00	$0.05 ... 0.7$	$0.02...0.85$	$1.5...9$	$-1.5 ... 1.5$
			$1.5 ...1000$	$0.02...0.7$	$>3.0$	$-1.6...1.6$
[24]	$D^{\pm}$ in DIS	2004	$>4$		$>2.0$	$-1.5 ... 1.5$
[22]	$D^*$+jets in $\gamma p$	98-00	$<1$		$>3$	$-1.5 ... 1.5$	$130<W_{\gamma p}<280$ GeV
							$E_t^{jet}>6$ GeV
							$-1.5<\eta^{jet}<2.4$
[21]	$D^*$+jets in $\gamma p$	98-00	$<1$		$>2$	$-1.5 ... 1.5$	$130<W_{\gamma p}<280$ GeV
	(frag.funct.)						$E_t^{jet}>9$ GeV
							$-2.4<\eta^{jet}<2.4$
[19]	$D^*$ in $\gamma p$	98-00	$<1$		$1.9...20$	$-1.6...1.6$	$130<W_{\gamma p}<285$ GeV
							$p_t(D^*)/E_t^{\theta>10^{\circ}}>0.15$
[20]	$D$ in $\gamma p$	98-00	$<1$		$>3.8$	$-1.6...1.6$	$130<W_{\gamma p}<300$ GeV
[49]	$D^{**}$	95-00			$>2$	$-1.5 ... 1.5$	$p_t(D^*)/E_t^{\theta>10^{\circ}}>0.15$
[50]	$D_{s1}^{\pm}$	95-00			$>2$	$-1.5 ... 1.5$	$p_t(D^*)/E_t^{\theta>10^{\circ}}>0.15$
[25]	$D^*$+dijets in $\gamma p$	98-00	$<1$				$E_t^{jet}>7(6)$ GeV
							$-1.5<\eta^{jet}<2.4$
							$130<W_{\gamma p}<280$ GeV
[26]	$D$ DIS	98-00	$1.5 ...1000$	$0.02...0.7$	$>3$	$-1.6...1.6$

Charm production has been measured in a number of analyses, the first observations at HERA dating back to the year 1995 [11,2]. Since then, with increasing statistics and continuously upgraded detectors the measurements have become increasingly precise and detailed in their scope. Inclusive charm production has been measured in both photoproduction [2,12,19,7] and electroproduction [13,15,16,3,4,5,8,43]. Reconstructed $D^*$ mesons have also been used for measurements of open charm in diffraction [57,58,55,56], a process which is not addressed in this report.