Hadronic resonance production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>d</mml:mi><mml:mo>+</mml:mo><mml:mi mathvariant="normal">Au</mml:mi></mml:mrow></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:msub><mml:mi>s</mml:mi><mml:mrow><mml:mi mathvariant="italic">NN</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>200</mml:mn></mml:mrow></mml:math>GeV measured at the BNL Relativistic Heavy Ion Collider
Аннотация
We present the first measurements of the $\ensuremath{\rho}(770){}^{0},{K}^{*}(892),\ensuremath{\Delta}(1232){}^{++},\ensuremath{\Sigma}(1385)$, and $\ensuremath{\Lambda}(1520)$ resonances in $d+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV, reconstructed via their hadronic decay channels using the STAR detector (the solenoidal tracker at the BNL Relativistic Heavy Ion Collider). The masses and widths of these resonances are studied as a function of transverse momentum ${p}_{T}$. We observe that the resonance spectra follow a generalized scaling law with the transverse mass ${m}_{T}$. The $\ensuremath{\langle}{p}_{T}\ensuremath{\rangle}$ of resonances in minimum bias collisions are compared with the $\ensuremath{\langle}{p}_{T}\ensuremath{\rangle}$ of $\ensuremath{\pi},K$, and $\overline{p}$. The ${\ensuremath{\rho}}^{0}/{\ensuremath{\pi}}^{\ensuremath{-}},{K}^{*}/{K}^{\ensuremath{-}},{\ensuremath{\Delta}}^{++}/p,\ensuremath{\Sigma}(1385)/\ensuremath{\Lambda}$, and $\ensuremath{\Lambda}(1520)/\ensuremath{\Lambda}$ ratios in $d+\mathrm{Au}$ collisions are compared with the measurements in minimum bias $p+p$ interactions, where we observe that both measurements are comparable. The nuclear modification factors (${R}_{d\mathrm{Au}}$) of the ${\ensuremath{\rho}}^{0},{K}^{*}$, and ${\ensuremath{\Sigma}}^{*}$ scale with the number of binary collisions (${N}_{\mathrm{bin}}$) for ${p}_{T}>$ 1.2 GeV/$c$.
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