[ <a href=../96june.html>Table of contents</a>
  | <a href=v9n304.html>Next Page</a>
  | <a href=v9n302.html>Previous Page</a> ]<p>
-----------------------------------------------------------------
<title>Successful BES Annual Meeting</title>
<h1>Successful BES Annual Meeting</h1>
    On 7-12 June 1996, the 5th Annual Meeting of the BES International 
Collaboration was held successfully. There are more than 120 participants 
coming from six Chinese institutions (Institute of High Energy Physics, 
University of Science and Technology of China, Tsinghua University, Shandong 
University, Huazhong Normal University and Shanghai Jiaotong University) and 
four US institutions (Colorado State University, University of Texas at 
Dallas, University of Hawaii and California Institute of Technology).<p>
    An amount of 10 million yuan RMB and 0.4 million US dollars is offered 
by China and USA government, respectively, for the upgrade of BES detector. 
With the efforts of both Chinese and US physicists, subsystems of the 
detector had been installed in March 1996 according to the schedule and 
had been tested in April. The overall check of the upgraded BES-Άς started 
in May using BEPC colliding beams. 60,000 J/psi events were collected 
during these runs.<p>
    With great pleasure, both Chinese and US physicists recognized that the 
construction of BES-Άς detector has been basically completed. Subdetectors 
such as Main Drift Chamber, Barrel Shower Counter, Endcap Shower Counter, 
Luminosity Monitor and Trigger System, have been put into regular operation. 
The design values of main parts of the detector have  nearly reached. 
The improved performance of  Time of Flight Counter, Vertex Tracking Chamber and 
Online Data Acquisition System, obviously better than the previous BES, would 
supply a solid base for the $\tau$-charm physics research in future.$
    The BES-Άς Offline Analysis System has been developed and set up on 
HP/UNIX. JULIE reconstruction codes for Main Drift Chamber and Vertex Tracking 
Chamber have passed preliminary tests using new J/psi data. The reconstruction 
and calibration codes for individual sub-detectors, adapted from routines 
on VAX/VMS, are put into run (including TOF, dE/dx and so on). Improved 
Monte Carlo codes for the Barrel Shower Counter will simulate real data 
much better, and simulation  software for Endcap Shower Counter and Vertex 
Tracking Chamber is newly developed.<p>
    Both Chinese and US scientists in the BES  reviewed fruitful physics 
results obtained in the past year, and 
figured out that interesting topics, i.e., 
search for glueball, puzzle in  $\psi^{'}$ 
suppressed hadronic decays and improved 
$f_{D_{s}}$ measurement, are hot points in high energy physics.  
  BES Collaboration is planning to submit 6 papers 
to journals next year and 13 contribution papers will be reported 
in international conferences  this year.<p>
    A plan of new physics runs for next year 
is worked out in the meeting. The BES-II will run at J/psi
 energy for half a year right after 
its overall checkout is completed. During this period, 10 days  will 
be spent  for $\psi_{'}$ scan and another 10 days for R pre-measurement.<p>
<author>Zhang Changchun</author>
<p>
[ <a href=../96june.html>Table of contents</a>
  | <a href=v9n304.html>Next Page</a>
  | <a href=v9n302.html>Previous Page</a> ]<p>
June 1996 BEPC News<p>