From: Murray, Michael J (mjmurray@ku.edu)
Date: Thu Sep 25 2003 - 13:19:11 EDT
Dear Jens Ivar,
thanks for the new drafts. I couldnt' improve on yours. I found
a few typos in Yin's but my main concern was the connection to theory. The
theory references should focus on the question of why energy loss might be
different for different particles.
Is it just a meson/baryon effect or does it depend on wheather we have
produced quarks or direct quarks that came in with the beam.
Yours Michael
I have included comments on Yin's abstract below
\documentclass[]{article}
\begin{document}
\begin{center}
{\bf High $p_{\rm T}$ spectra of protons and charged pions
in nuclear collisions at $\sqrt{s} = 200$ GeV\\}
\vspace{1cm}
{Z. Yin\\} {for the {\bf BRAHMS} collaboration\\}
\end{center}
\vspace{2cm}
Data from all four experiments at Relativistic Heavy Ion Collider (RHIC)
have shown a strong
nuclear suppression of high $p_{T}$ inclusive hadron yields in central
Au+Au collisions, compared to $p+p$ and d+Au interactions.
This is widely seen as the
experimental confirmation of jet quenching. However, the amount of
suppression at midrapidity has been %MJM
shown to depend on the hadron species [1].
WHAT WE WANT HERE IS NOT TO UNDERSTAND HADRONIZATION ITSELF BUT RATHER
HOW ENERGY LOSS MIGHT DEPEND ON THE NATURE OF THE HIGH PT PARTICLE.
FOR EXAMPLE WHAT DOES THEORY SAY ABOUT THE ENERGY LOSS FOR PARTICLES THAT
BECOME MESONS VERSUS THOSE THAT BECOME HADRONS.
There have been recent attempts to describe the different behaviour of
baryons and mesons through different hadronization mechanisms [2] (e.g.
gluon junction, recombination or parton coalescence).
The BRAHMS spectrometers have the unique ability to identify hadrons
over a broad range of rapidity and transverse momenta. This allows us
to study the high $p_{\rm T}$ hadron production mechanism through
rapidity dependence of hadron spectra and particle composition.
In this talk the BRAHMS collaboration presents new measurements for
identified
high $p_{\rm T}$ charged hadron production in Au+Au and d+Au collisions at
different rapidities and centralities. (Anti)-Proton spectra at midrapidity
were measured up to $p_{\rm T} = 3.5$ GeV/c, $\pi^-$ spectra at forward
rapidity cover $p_{\rm T}$ range up to 4.0 GeV/c. First results show %MJM
a clear suppression of $\pi^-$ at forward rapidity ($y = 2.2$).
Particle composition will further be discussed
in terms of $p/h^+$ and $\bar{p}/h^-$ at
midrapidity and of $\pi^-/h^-$ at forward rapidity. \\
\par
[1] K. Adcox et al., Phys. Rev. Lett. 88 (2002) 242301;\ \
C. Adler et al., Phys. Rev. Lett. 86 (2001) 4778;\ \
S. S. Adler et.al., nucl-ex/0307022 .\\
AND BRAHMS
[2] Z. W. Lin and C. M. Ko, Phys. Rev. Lett. 89 (2002) 202302; \ \
S. A. Voloshin, Nucl. Phys. A715 (2003) 379c; \ \
D. Molnar and S. A. Voloshin, nucl-th/0302014; \ \
Z. W. Lin and D. Molnar, nucl-th/0304045.\\
\end{document}
-----Original Message-----
From: Jens Ivar Jordre [mailto:jensivar.jordre@fi.uib.no]
Sent: Thu 9/25/2003 10:24 AM
To: BRAHMS List
Cc:
Subject: Updated QM abstracts from Bergen.
Dear collaborators.
Here are updated abstracts from Bergen. Please read and comment.
Best wishes from
Zhongbao and Jens Ivar
--
_____________________________________________________
________| Jens Ivar Jřrdre |_______
\ | Dept. of Physics Office: 521 | /
\ | Allégt 55 Phone: +47 55 58 27 92 | /
\ | 5007 Bergen Fax: +47 55 58 94 40 | /
/ | Norway E-mail: jensivar.jordre@fi.uib.no | \
/ |_____________________________________________________| \
/__________) (_________\
"To be or not to bop"
(Dizzy Gillespie)
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