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

The STAR collaboration
Phys.Rev.C 71 (2005) 064902, 2005.

Abstract (data abstract)
The short-lived $K(892)^*$ 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 $sqrt{s_{NN}} =200GeV$ Au+Au and $p+p$ collisions reconstructed via its hadronic decay channels $K(892)^{*0}->K\pi$ and $K(892)^{*\pm}->K_S^0\pi^{\pm}$ 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 pT (2<pT<=4GeV/c).

  • Figure 2

    Data from Figure 2

    10.17182/hepdata.100595.v1/t1

    $K_S^0$ signal observed in the $\pi^+\pi^−$ invariant mass distribution reconstructed from the decay topology method via $K_S^0->\pi^+\pi^−$ in $p+p$ collisions....

  • Figure 5

    Data from Figure 5

    10.17182/hepdata.100595.v1/t2

    The $K\pi$ invariant mass distributions after event-mixing background subtraction (open star symbols) and like-sign background subtraction with different daughter momentum...

  • Figure 6

    Data from Figure 6

    10.17182/hepdata.100595.v1/t3

    The $K\pi$ invariant mass distribution integrated over the $K^*$ $p_T$ for central Au+Au (upper panel) and minimum bias $p +...

  • Figure 7-1-1

    Data from Figure 7

    10.17182/hepdata.100595.v1/t4

    The $K^{*0}$ mass (upper panel) and width (lower panel) as a function of $p_T$ for minimum bias $p + p$...

  • Figure 7-1-2

    Data from Figure 7

    10.17182/hepdata.100595.v1/t5

    The $K^{*0}$ mass (upper panel) and width (lower panel) as a function of $p_T$ for minimum bias $p + p$...

  • Figure 7-2-1

    Data from Figure 7

    10.17182/hepdata.100595.v1/t6

    The $K^{*0}$ mass (upper panel) and width (lower panel) as a function of $p_T$ for minimum bias $p + p$...

  • Figure 7-2-2

    Data from Figure 7

    10.17182/hepdata.100595.v1/t7

    The $K^{*0}$ mass (upper panel) and width (lower panel) as a function of $p_T$ for minimum bias $p + p$...

  • Figure 8

    Data from Figure 8

    10.17182/hepdata.100595.v1/t8

    The $K_S^0\pi^\pm$ invariant mass distribution integrated over the $K^{*\pm}$ $p_T$ for minimum bias $p + p$ collisions (upper panel) and...

  • Figure 9-1

    Data from Figure 9

    10.17182/hepdata.100595.v1/t9

    The $K^{*0}$ and $K^{*\pm}$ reconstruction efficiency multiplied by the detector acceptance as a function of $p_T$ in minimum bias $p...

  • Figure 9-2

    Data from Figure 9

    10.17182/hepdata.100595.v1/t10

    The $K^{*0}$ and $K^{*\pm}$ reconstruction efficiency multiplied by the detector acceptance as a function of $p_T$ in minimum bias $p...

  • Figure 9-3

    Data from Figure 9

    10.17182/hepdata.100595.v1/t11

    The $K^{*0}$ and $K^{*\pm}$ reconstruction efficiency multiplied by the detector acceptance as a function of $p_T$ in minimum bias $p...

  • Figure 9-4

    Data from Figure 9

    10.17182/hepdata.100595.v1/t12

    The $K^{*0}$ and $K^{*\pm}$ reconstruction efficiency multiplied by the detector acceptance as a function of $p_T$ in minimum bias $p...

  • Figure 10-1

    Data from Figure 10

    10.17182/hepdata.100595.v1/t13

    The $(K^* + \bar{K^*})/2$ invariant yields as a function of $m_T − m_0$ for |y| < 0.5 from minimum bias...

  • Figure 10-2

    Data from Figure 10

    10.17182/hepdata.100595.v1/t14

    The $(K^* + \bar{K^*})/2$ invariant yields as a function of $m_T − m_0$ for |y| < 0.5 from minimum bias...

  • Figure 10-3

    Data from Figure 10

    10.17182/hepdata.100595.v1/t15

    The $(K^* + \bar{K^*})/2$ invariant yields as a function of $m_T − m_0$ for |y| < 0.5 from minimum bias...

  • Figure 11-1

    Data from Figure 11

    10.17182/hepdata.100595.v1/t16

    (Color online) The invariant yields for both $(K^{*0} + \bar{K^{*0}})/2$ and $(K^{*+} + K^{*-})/2$ as a function of $p_T$ for...

  • Figure 11-2

    Data from Figure 11

    10.17182/hepdata.100595.v1/t17

    (Color online) The invariant yields for both $(K^{*0} + \bar{K^{*0}})/2$ and $(K^{*+} + K^{*-})/2$ as a function of $p_T$ for...

  • Figure 12

    Data from Figure 12

    10.17182/hepdata.100595.v1/t18

    (Color online) The $K^*$ $$ as a function of $dN_{ch}/d\eta$ compared to that of $\pi^−$, $K^−$, and $p$ for minimum...

  • Figure 13-1

    Data from Figure 13

    10.17182/hepdata.100595.v1/t19

    The $K^*/K$ (upper panel) and $\phi/K^*$ (lower panel) yield ratios as a function of the c.m. system energies. The yield...

  • Figure 13-2

    Data from Figure 13

    10.17182/hepdata.100595.v1/t20

    The $K^*/K$ (upper panel) and $\phi/K^*$ (lower panel) yield ratios as a function of the c.m. system energies. The yield...

  • Figure 15

    Data from Figure 15

    10.17182/hepdata.100595.v1/t21

    The $K^{*0}$ v2 (filled stars) as a function of $p_T$ for minimum bias Au+Au collisions compared to the $K^{0}_S$ (open...

  • Figure 16

    Data from Figure 16

    10.17182/hepdata.100595.v1/t22

    The $K^*$ $R_{AA}$ (filled triangles) and $R_{CP}$ (filled circles) as a function of $p_T$ compared to the $K^{0}_S$ (open circles)...

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