[Brahms-l] Fwd: STAR new paper on Balance Functions from Au+Au, d+Au, and p+p Collisions

FYI



> From: Nu Xu <NXu_at_lbl.gov>
> Date: May 7, 2010 2:06:40 AM EDT
> To: Barbara Jacak <jacak_at_skipper.physics.sunysb.edu>, Flemming  
> Videbaek <videbaek_at_bnl.gov>, Wit Busza <busza_at_MIT.EDU>, Steven  
> Vigdor <vigdor_at_bnl.gov>
> Cc: Nu Xu <NXu_at_lbl.gov>
> Subject: STAR new paper on Balance Functions from Au+Au, d+Au, and p 
> +p Collisions
>
> Dear Barbara, Wit, Flemming and Steve,
>
> I am pleased to announce that the STAR collaboration will submit to  
> Physical Review C,  in one week's time,  a new paper on balance  
> functions from Au+Au, d+Au, and p+p collisions at RHIC. The title  
> and abstract are included below.
>
> Best regards,
>
> Nu Xu
>
> -----------------------------------------------------------------------
> Nu Xu
>
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> -----------------------------------------------------------------------
>
> Title:  "Balance Functions from Au+Au, d+Au, and p+p Collisions at $ 
> \sqrt{s_{NN}}$ = 200 GeV"
>
> Abstract: "Balance functions have been measured for charged particle  
> pairs, identified charged pion pairs, and identified charged kaon  
> pairs in Au+Au, d+Au, and p+p collisions at $\sqrt{s_{NN}}$ = 200  
> GeV at the Relativistic Heavy Ion Collider using the STAR detector.  
> These balance functions are presented in terms of relative  
> pseudorapidity, $\Delta \eta$, relative rapidity, $\Delta y$,  
> relative azimuthal angle, $\Delta \phi$ and invariant relative  
> momentum, $q_{inv}$. In addition, balance functions are shown in  
> terms of the three components of $q_{inv}$: $q_{long}$, $q_{out},  
> and $q_{side}$. For charged particle pairs, the width of the balance  
> function in terms of $\Delta \eta$ scales smoothly with the number  
> of participating nucleons, while HIJING and UrQMD model calculations  
> show no dependence on centrality or system size. For charged  
> particle and charged pion pairs, the balance functions widths in  
> terms of $\Delta \eta$ and $\Delta y$ are narrower in central Au+Au  
> collisions than in peripheral collisions. The width for central  
> collisions is consistent with thermal blast-wave models where the  
> balancing charges are highly correlated in coordinate space at  
> breakup. This strong correlation might be explained either by  
> delayed hadronization or by limited diffusion during the reaction.  
> Furthermore, the narrowing trend is consistent with the increased  
> cooling inherent to more central collisions. In contrast, the width  
> of the balance function for charged kaon pairs in terms of $\Delta y 
> $ shows little centrality dependence, which may signal a different  
> production mechanism for kaons. The widths of the balance functions  
> for charged pions and kaons in terms of $q_{inv}$ narrow in central  
> collisions compared to peripheral collisions."



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