Zobrazeno 101 - 110
of 300
pro vyhledávání: '"Pisarski, Robert D."'
Autor:
Pisarski, Robert D., Tytgat, Michel
Publikováno v:
Phys.Rev.D54:2989-2993,1996
For an exact chiral symmetry which is spontaneously broken at zero temperature, we show that at nonzero temperature, generally pions travel at {\it less} than the speed of light. This effect first appears at next to leading order in an expansion abou
Externí odkaz:
http://arxiv.org/abs/hep-ph/9604404
Autor:
Pisarski, Robert D.
Publikováno v:
Phys.Rev.Lett.76:3084-3087,1996
Using constituent quarks coupled to a linear sigma model at nonzero temperature, I show that many anomalous mesonic amplitudes, such as $\pi^0 \rightarrow \gamma \gamma$, vanish in a chirally symmetric phase. Processes which are allowed, such as $\pi
Externí odkaz:
http://arxiv.org/abs/hep-ph/9601316
Autor:
Pisarski, Robert D.
In a constituent quark model at nonzero temperature, the amplitude for $\pi^0 \rightarrow 2 \gamma$ vanishes in a chirally symmetric phase, while that for $\pi^0 \sigma \rightarrow 2 \gamma$ does not.
Comment: 7 pages, LaTeX. To appear in: "From
Comment: 7 pages, LaTeX. To appear in: "From
Externí odkaz:
http://arxiv.org/abs/hep-ph/9510375
Autor:
Pisarski, Robert D.
I review results on the shift of the $\rho$ meson mass at nonzero temperature in a gauged linear sigma model, under the assumption of strict vector meson dominance. (Based upon a talk presented at the International Workshop on "Chiral Dynamics in Had
Externí odkaz:
http://arxiv.org/abs/hep-ph/9505257
Autor:
Pisarski, Robert D.
I discuss several topics in the applications of chiral symmetry at nonzero temperature, including: where the rho goes, disoriented chiral condensates, and the phase diagram for $QCD$ with $2+1$ flavors. (Based upon talks presented at the "Workshop on
Externí odkaz:
http://arxiv.org/abs/hep-ph/9503330
Autor:
Pisarski, Robert D.
Publikováno v:
Phys.Rev. D52 (1995) 3773-3776
If the phase transition of $QCD$ at nonzero temperature is dominated by the (approximate) restoration of chiral symmetry, then the transition might be characterized using a gauged linear sigma model. Assuming that vector meson dominance holds, such s
Externí odkaz:
http://arxiv.org/abs/hep-ph/9503328
Autor:
Pisarski, Robert D.
Publikováno v:
Nucl.Phys. A590 (1995) 553c-556c
I discuss different models which predict changes in the mass of the thermal $\rho$ field. I emphasize that while the predictions are strongly model dependent, nevertheless substantial shifts in the thermal $\rho$ mass are expected to occur at the poi
Externí odkaz:
http://arxiv.org/abs/hep-ph/9503329
Publikováno v:
Phys.Rev.Lett. 73 (1994) 1754-1757
We compute the effective potential for the phase of the Wilson line at high temperature in the standard model to one loop order. Besides the trivial vacua, there are metastable states in the direction of $U(1)$ hypercharge. Assuming that the universe
Externí odkaz:
http://arxiv.org/abs/hep-ph/9406264
Autor:
Pisarski, Robert D., Skokov, Vladimir
Publikováno v:
In Nuclear Physics, Section A December 2016 956:673-676
Publikováno v:
Phys.Rev.Lett. 72 (1994) 2143-2146
Rajagopal and Wilczek have proposed that relativistic nuclear collisions can generate domains in which the chiral condensate is disoriented. If sufficiently large ({\it i.e.} nucleus sized), such domains can yield measurable fluctuations in the numbe
Externí odkaz:
http://arxiv.org/abs/hep-ph/9310228