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Induced theta vacua in heavy ion collisions Buckley, Kirk B. W.
Abstract
In the following we demonstrate that it is possible to create non-zero θ-states during heavy ion collisions. Using the effective Lagrangian for low energy QCD derived in [1, 2], we will show numerically that in the period immediately following a quench, the chiral condensate phases fa and fa will relax to the value ~ θ /N[sub f]. This is a true condensate in the sense that if the volume of the system is changed, the zero mode still remains. If such a state can be created, it would decay by various mechanisms to the θ[sup fund] = 0 state which exists in our world. We will discuss the experimental signature for the produced non-trivial θ-state. In particular, we will provide evidence that the creation of a non-zero θ -state would result in an excess of low momentum particles (π⁰, ƞ, and ƞ'-mesons) , in the (10 - 100) MeV range. This phenomena could possibly account for the excess of low momentum dileptons observed at CERN [3, 4].
Item Metadata
Title |
Induced theta vacua in heavy ion collisions
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
2000
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Description |
In the following we demonstrate that it is possible to create non-zero θ-states during
heavy ion collisions. Using the effective Lagrangian for low energy QCD derived in [1, 2], we will show numerically that in the period immediately following a quench, the chiral condensate phases fa and fa will relax to the value ~ θ /N[sub f]. This is a true condensate in the sense that if the volume of the system is changed, the zero mode still remains. If such a state can be created, it would decay by various mechanisms to the θ[sup fund] = 0 state
which exists in our world. We will discuss the experimental signature for the produced
non-trivial θ-state. In particular, we will provide evidence that the creation of a non-zero θ -state would result in an excess of low momentum particles (π⁰, ƞ, and ƞ'-mesons) , in
the (10 - 100) MeV range. This phenomena could possibly account for the excess of low
momentum dileptons observed at CERN [3, 4].
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Extent |
2395110 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-07-09
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0089512
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2000-11
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.