home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!sun-barr!ames!agate!dog.ee.lbl.gov!csa2.lbl.gov!sichase
- From: sichase@csa2.lbl.gov (SCOTT I CHASE)
- Newsgroups: sci.physics
- Subject: Re: mass of quarks?
- Date: 31 Jul 92 18:33:56 GMT
- Organization: Lawrence Berkeley Laboratory - Berkeley, CA, USA
- Lines: 29
- Distribution: usa
- Message-ID: <25110@dog.ee.lbl.gov>
- References: <1992Jul29.130925.1147@samba.oit.unc.edu> <25025@dog.ee.lbl.gov> <12587@inews.intel.com>
- Reply-To: sichase@csa2.lbl.gov
- NNTP-Posting-Host: 128.3.254.197
- Keywords: quark property
- News-Software: VAX/VMS VNEWS 1.3-4
-
- In article <12587@inews.intel.com>, bhoughto@sedona.intel.com (Blair P. Houghton) writes...
- >In article <25025@dog.ee.lbl.gov> sichase@csa2.lbl.gov writes:
- >>Loosely speaking, you heat up some matter until the quarks and qluons are
- >>liberated. If they are massive, then you heat things up some more and when
- >>chiral symmetry is restored they lose their mass. Cute, huh?
- >
- >What do you mean, "heat?"
- >
-
- Take two heavy nuclei and accelerate them to many GeV per nucleon. Collide
- them and you get a hot nucleon gas, which if the temperature (energy density)
- is high enough (QCD seems to predict that) a phase transition to a
- deconfined phase takes place.
-
- A somewhat different, but also valid, picture talks about "melting the
- QCD vacuum" in the excited region left behind when the two nuclei
- interpenetrate and fly away drawing out oodles of hadronic strings.
-
- The details of what actually happens are somewhat unclear, but in both
- pictures you end up with a region of high energy density which results
- in a new phase of nuclear matter.
-
- -Scott
- --------------------
- Scott I. Chase "The question seems to be of such a character
- SICHASE@CSA2.LBL.GOV that if I should come to life after my death
- and some mathematician were to tell me that it
- had been definitely settled, I think I would
- immediately drop dead again." - Vandiver
-