\documentclass[12pt]{article} %\usepackage{axodraw} \usepackage{times} \usepackage{epsfig} \input{epsf} \setlength{\topmargin}{-1.5 cm} \setlength{\evensidemargin}{.0 cm} \setlength{\oddsidemargin}{.0 cm} \setlength{\textheight}{9.5 in} \setlength{\textwidth}{6.4 in} \parskip = 2ex %definizione slash \def\slash#1{\ooalign{$\hfil/\hfil$\crcr$#1$}} %\esempio: \slash\partial \renewcommand{\thefigure}{\arabic{figure}} %\newcommand\mathrm{\rm} \def\lra{\leftrightarrow} \def\Ph{{\hat P}} \def\hs{\hspace{.1mm}} \def\naive{na\"{\i}ve} \newcommand\M[2]{|{\cal{M}}^{#1}_{#2}|^2} \newcommand\as{\alpha_{\mathrm{S}}} \newcommand\gs{g_{\mathrm{S}}} \newcommand\rgs{\mu^\epsilon \,g_{\mathrm{S}}^u} \newcommand\smfrac[2]{{\textstyle\frac{#1}{#2}}} \def\hf{\smfrac{1}{2}} \newcommand\f[2]{\frac{#1}{#2}} \def\ep{\epsilon} \def\ktil{\widetilde k} \def\qtil{\widetilde q} \def\ee{$e^+e^-$} \def\beq{\begin{equation}} \def\eeq{\end{equation}} \def\beeq{\begin{eqnarray}} \def\eeeq{\end{eqnarray}} \def\cm{{\cal M}} \def\bom#1{{\mbox{\boldmath $#1$}}} \def\to{\rightarrow} \def\kper{k_{\perp}} \def\LO{leading order} \def\NLO{next-to-leading order} \def\kt{k_\perp} \newcommand{\la}{\langle} \newcommand{\ra}{\rangle} \def\vspaceinarray{\nonumber ~&~&~\\} \def\nn{\nonumber} \def\arrowlimit#1{\mathrel{\mathop{\longrightarrow}\limits_{#1}}} \def\s#1#2{s_{#1#2}} \def\AP{Altarelli--Parisi } \def\ID{1 \kern -.45 em 1} \def\RS{{\scriptscriptstyle\rm R\!.S\!.}} \def\cdr{{\scriptscriptstyle\rm C\!.D\!.R\!.}} \def\dimr{{\scriptscriptstyle\rm D\!.R\!.}} \def\drs{\delta_g^{\RS}} \def\dcdr{\delta_g^{\cdr}} \def\ddr{\delta_g^{\dimr}} \def\sp{{\bom {Sp}}} \def\ket#1{|{#1}\ra} \def\bra#1{\la{#1}|} \def\mket#1{|{#1}>_m} \def\mbra#1{{}_m\!\!<{#1}|} \def\oket#1{|{#1}>_{m+1}} \def\obra#1{_{m+1}\!\!<{#1}|} \def\aket#1{|{#1}>_{m+1+a}} \def\abra#1{{}_{m+1+a}\!\!<{#1}|} \def\amket#1{|{#1}>_{m+a}} \def\ambra#1{{}_{m+a}\!\!<{#1}|} \def\ubar{{\overline u}} \def\vbar{{\overline v}} \def\vep{{\varepsilon}} %\def\vep{{\Large \varepsilon}} \def\Eq#1{Eq.~({\ref{#1}})} \def\Eqs#1{Eqs.~({\ref{#1}})} \def\ta#1{#1\hspace{-.42em}/\hspace{-.07em}} %\def\ln#1{\mathrm{ln}\left(#1\right)} \begin{document} \begin{titlepage} \renewcommand{\thefootnote}{\fnsymbol{footnote}} \vspace*{60mm} \begin{center} {\LARGE \bf Research Plan for Spin Physics at RHIC} \end{center} \par \vspace{2mm} \par \vspace{2mm} \begin{center} {\large \bf Abstract} \end{center} \begin{quote} \pretolerance 10000 \end{quote} \vspace*{\fill} \end{titlepage} \renewcommand{\thefootnote}{\fnsymbol{footnote}} \setlength{\columnsep}{30pt} \section{Executive Summary} Briefly describe the physics case/highlights of the RHIC Spin program, the detector and accelerator capabilities and their development, and the plans over the next few years. \section{The case for RHIC Spin} \subsection{Introduction: what we know so far, what else we would like to learn, and why} $\bullet$ initial information on spin structure of the nucleon, spin ``crisis'' \& spin sum rule \\ $\bullet$ motivation for studies of gluon polarization $\Delta g$ and for further studies of quark polarization \\ $\bullet$ parton angular momenta \\ $\bullet$ transverse-spin asymmetries, transversity, parton correlations, parton transverse momentum \& spin, and what they tell us about the nucleon \\ $\bullet$ physics of elastic scattering \\ $\bullet$ wider context of nucleon spin structure \\ $\bullet$ why polarized pp scattering to answer these questions ? What can it probe ? Complementarity to DIS \\ (leads into next section) \subsection{Unpolarized pp scattering (Werner, Stefan)} $\bullet$ Introduction: lay out ideas, how do we describe inelastic pp scattering? \\ $\bullet$ pQCD, collinear factorization (and beyond), lowest and higher orders etc.\\ $\bullet$ (perhaps:) uncertainties \\ $\bullet$ $\pi^0$, $\gamma$ measurements from RHIC \\ robust understanding of probes used for spin structure \\ $\bullet$ fractions of subprocesses (midrapidity \& forward) \\ $\bullet$ from that, identify the probes that are most sensitive to gluons etc. \subsection{Probing longitudinal spin structure of the nucleon} $\bullet$ pQCD with spin, subprocess analyzing power ({\bf{Marco}}) \\ $\bullet$ gluon: $\pi$, jet, $\gamma$, $\gamma$+jet, $Q\bar{Q}$\ldots ({\bf{Steve,Yuji, Hal,Les}}) \\ $\bullet$ what are the key predictions for $\Delta g$ processes? ({\bf{Werner, Marco+\ldots}}) \\ show spin asymmetries $A_{LL}$ for $\pi^0$, jet, $\gamma$ and their dependence on $\Delta g$. Use for example currently estimated uncertainty on $\Delta g$ from DIS and give estimates of how precise measurements need to be ``at least'' in order to obtain a significant improvement. This will provide the ``minimum requrements''. Discuss relevance of ``correlation observables'' such as jet+photon, pion+pion, etc. Discuss development with time.\\ $\bullet$ (anti)quarks, $W$ ({\bf{Naohito,Bernd}})\\ $\bullet$ this should include in particular a discussion of importance of 500~GeV running. \subsection{Transverse spin structure} $\bullet$ why it is different from longitudinal ({\bf{Jianwei}}) \\ $\bullet$ history, previous $A_N$ measurements, planned measurements ({\bf{Les,Matthias,Akio}}) \\ $\bullet$ assess what requirements would be for key measurements here, and how they would compare to longitudinal running.\\ \subsection{``What else is going on in the world''} $\bullet$ briefly discuss current efforts in DIS and their expected results \& timelines ({\bf{Ernst, Akio}}) \\ \subsection{Elastic scattering (Larry, Elliot, George, Sandro)} \subsection{Future plans/ideas at RHIC} $\bullet$ $W+c$ ({\bf{Yuji ?}}) \\ $\bullet$ physics beyond the Standard Model? ({\bf{Vladimir}}) \\ $\bullet$ other opportunities possibly offered by high-luminosity running (and/or a new detector) \\ $\bullet$ opportunities with polarized beams in p+heavy-ion physics ({\bf{Les}})\\ \subsection{Connection to eRHIC (Abhay)} \newpage \section{Accelerator--present \& future (Wolfram, Mei)} $\bullet$ successes so far \\ $\bullet$ expected development in polarization and luminosity over next few years \\ $\bullet$ polarimetry {\bf{(Gerry, Sandro)}}\\ $\bullet$ expectations with 10, 5 physics week scenarios \\ $\bullet$ long-term perspective (RHIC II, new ideas for luminosity etc.) \section{Experiments} \subsection{Phenix (Matthias)} $\bullet$ present status \& issues to solve \\ $\bullet$ priorities \\ $\bullet$ planned upgrades and developments \\ $\bullet$ required resources \subsection{Star (Steve)} $\bullet$ present status \& issues to solve \\ $\bullet$ priorities \\ $\bullet$ planned upgrades and developments \\ $\bullet$ required resources \subsection{Other experiments} $\bullet$ Brahms ({\bf{Flemming}}) \\ $\bullet$ New detector \\ $\bullet$ eRHIC detector \\ $\bullet$ pp2pp ({\bf{Wlodek}}) \\ $\bullet$ jet ({\bf{Sandro}}) \section{Spin plan schedule (Gerry)} \subsection{5 physics weeks} \subsection{10 physics weeks} \section{Summary (Gerry)} \begin{figure}[t!] \begin{center} \vspace*{-0.6cm} \epsfig{figure=all_gamma.epsi,width=0.5\textwidth,angle=90} \end{center} %\vspace*{-3.7cm} \caption{ Spin asymmetry $A_{LL}$ for prompt photon production for various gluon polarizations. Expected error bars are for $P=50\%$ and ${\cal L}=100$/pb. Phenix acceptance. \label{fig1}} \vspace*{1.cm} \end{figure} \section*{Acknowledgments} \begin{thebibliography}{90} \end{thebibliography} \end{document}