K(892)* resonance production in Au+Au and p+p collisions at s(NN)**(1/2) = 200-GeV at STAR

resonance provides an efficient tool to probe properties of the hot and dense medium produced in relativistic heavy-ion collisions. We report measurements of

K^{*}

in

\sqrt{s_{_{NN}}}

= 200 GeV Au+Au and

p+p

collisions reconstructed via its hadronic decay channels

K(892)^{*0} \to K\pi

and

K(892)^{*\pm} \to K_S^0\pi^{\pm}

using the STAR detector at RHIC. The

K^{*0}

mass has been studied as a function of

p_T

in minimum bias

p+p

and central Au+Au collisions. The

K^{*}

p_T

spectra for minimum bias

p+p

interactions and for Au+Au collisions in different centralities are presented. The

K^{*}/K

yield ratios for all centralities in Au+Au collisions are found to be significantly lower than the ratio in minimum bias

p+p

collisions, indicating the importance of hadronic interactions between chemical and kinetic freeze-outs. A significant non-zero

K^{*0}

elliptic flow (

v_2

) is observed in Au+Au collisions and compared to the

K_S^0

and

\Lambda

v_2

. The nuclear modification factor of

K^{*}

at intermediate

p_{T}

is similar to that of

K_{S}^{0}

, but different from

\Lambda

. This establishes a baryon-meson effect over a mass effect in the particle production at intermediate

p_T

(

2 < p_T \leq 4

GeV/

c

).

Note:

16 pages, 16 figures, accepted by PRC for publication Journal-ref: Phys.Rev. C71 (2005) 064902

13.75.Cs
25.75.Dw
25.75.-q
p p: colliding beams
nucleus nucleus: colliding beams
scattering: heavy ion
gold
K*(892): hadroproduction
K*(892): hadronic decay
yield: (K*(892) K)

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