STAR Physics Database

K^(892)⁰ Production in Relativistic Heavy Ion Collisions at sqrt(s_NN) = 130 GeV
C. Adler et al.,* Phys. Rev. C. 66, 061901(R) (2002).

Fig.1a: Kπ invariant mass distribution from same-event pairs.

Only statistical errors are listed. Data measured for 0.4 GeV/c< p_T < 2.8 GeV/c in 14% most central collisions.

Invariant Mass Kπ [GeV/c²]	Counts [x10⁷]
0.615	0 +- 0
0.665	5.9945+- 0.00077
0.715	11.3645+- 0.0011
0.765	13.2925 +-0.0012
0.815	14.4098 +-0.0012
0.865	15.1673 +-0.0012
0.915	15.6647 +-0.0012
0.965	16.0213 +-0.0013
1.015	16.2724 +-0.0013
1.065	16.2693 +-0.0013
1.115	15.9214 +-0.0013
1.165	15.283 +-0.00124
1.215	14.4571 +-0.0012
1.265	13.5291 +-0.0012
1.315	12.5547 +-0.0011
1.365	11.5765 +-0.0011
1.415	10.6174 +-0.0010
1.465	9.69002 +-0.0010

Fig.1b: Kπ invariant mass distribution after subtraction of the mixed-event background.

Only statistical errors are listed. Data measured for 0.4 GeV/c< p_T < 2.8 GeV/c in 14% most central collisions.

Invariant Mass Kπ [GeV/c²]	Counts [x10⁴]
0.755	16.6 +- 1.1
0.765	19.2 +- 1.2
0.775	18.6 +- 1.2
0.785	15.8 +- 1.2
0.795	18.1 +- 1.2
0.805	19.1 +- 1.2
0.815	16.7 +- 1.2
0.825	16.2 +- 1.2
0.835	15.8 +- 1.2
0.845	14.7 +- 1.2
0.855	16.2 +- 1.2
0.865	15.0 +- 1.2
0.875	17.7 +- 1.2
0.885	16.7 +- 1.2
0.895	19.4 +- 1.2
0.905	18.5 +- 1.2
0.915	17.7 +- 1.2
0.925	13.2 +- 1.2
0.935	8.5 +- 1.2
0.945	5.9 +- 1.3
0.955	6.1 +- 1.3
0.965	3.0 +- 1.3
0.975	1.2 +- 1.3
0.985	3.4 +- 1.3
0.995	-2.9 +- 1.3
1.005	-2.4 +- 1.3
1.015	-5.9 +- 1.3
1.025	-5.6 +- 1.3
1.035	-6.3 +- 1.3
1.045	-6.5 +- 1.3

Fig.2: Invariant tranverse mass (m_T) distribution of (K^0 + Anti K^0)/2 (2π m_T)^-1 d²N/dy dm_T [c⁴/GeV²]

Only statistical errors are listed. Data measured for |y|<0.5 in 14% most central collisions. Bin edges in p_T in parentheses. m₀ taken to be 0.896 GeV/c^2.

p_T [GeV/c] (lower, upper)	m_T - m₀ [GeV/c²]	(2π m_T)^-1 d²N/dy dm_T [c⁴/GeV²]
(0.4,0.8)	0.182	1.88 +- 0.36
(0.8,1.2)	0.447	0.98 +- 0.17
(1.2,1.6)	0.766	0.446 +- 0.070
(1.6,2.0)	1.11	0.261 +- 0.033
(2.0,2.4)	1.48	0.100 +- 0.014
(2.4,2.8)	1.85	0.017 +- 0.008

Fig.3: Yield ratios vs sqrt(s_NN).

STAR data measured for |y|<0.5 in 14% most central collisions. K^*0 denotes an average (K^*0 + Anti-K^*0)/2, while K denotes an average (K⁺ + K^-)/2.

Ratio Type	sqrt(s_NN) [GeV]	Yield Ratio
K^*0/K	130	0.26 +- 0.03 (stat) +- 0.07 (sys)
φ/K^*0	130	0.49 +- 0.05 (stat) +- 0.12 (sys)

Text: dN/dy and inverse slope parameter T from an exponential fit to invariant m_T distribution for (K^0 + Anti-K^0)/2.

K^*0 data measured for |y|<0.5. K^*0 denotes an average (K^*0 + Anti-K^*0)/2, while h^- denotes the dN/dη for negative charged hadrons with |η| < 0.5.

Central 14%	dN/dy	10.0 +- 0.9 (stat) +- 2.5 (sys)
	K^*0/h^-	0.042 +- 0.004 (stat) +- 0.01 (sys)
	T [GeV]	0.40 +- 0.02 (stat) +- 0.04 (sys)
Minimum bias	dN/dy	4.5 +- 0.7 (stat) +- 1.4 (sys)
	K^*0/h^-	0.059 +- 0.008 (stat) +- 0.019 (sys)
	T fixed at value for central collisions

James Dunlop

Last modified: Fri Jan.3 12:25 EDT 2002

K*(892)0 Production in Relativistic Heavy Ion Collisions at sqrt(sNN) = 130 GeV C. Adler et al., Phys. Rev. C. 66, 061901(R) (2002).

Fig.1a: Kπ invariant mass distribution from same-event pairs.

Fig.1b: Kπ invariant mass distribution after subtraction of the mixed-event background.

Fig.2: Invariant tranverse mass (mT) distribution of (K*0 + Anti K*0)/2 (2π mT)-1 d2N/dy dmT [c4/GeV2]

Fig.3: Yield ratios vs sqrt(sNN).

Text: dN/dy and inverse slope parameter T from an exponential fit to invariant mT distribution for (K*0 + Anti-K*0)/2.

K^(892)⁰ Production in Relativistic Heavy Ion Collisions at sqrt(s_NN) = 130 GeV
C. Adler et al.,* Phys. Rev. C. 66, 061901(R) (2002).

Fig.2: Invariant tranverse mass (m_T) distribution of (K^0 + Anti K^0)/2 (2π m_T)^-1 d²N/dy dm_T [c⁴/GeV²]

Fig.3: Yield ratios vs sqrt(s_NN).

Text: dN/dy and inverse slope parameter T from an exponential fit to invariant m_T distribution for (K^0 + Anti-K^0)/2.