Charge and Isospin Fluctuations in High Energy pp-Collisions

Vesna Mikuta-Martinis, R. Boskovic Institute, Zagreb, Croatia

Charge and isospin event-by-event fluctuations in high-energy pp-collisions are predicted within the Unitary Eikonal Model (UEM), in particular the fluctuation patterns of the ratios of charged-to-charged and neutral-to-charged pions. These fluctuations are found to be sensitive to the presence of unstable resonances, such as r and W mesons. In the frame of UEM model we found that the charge-fluctuation observable D_(UEM) should be restricted to the interval 8/3 <= D_(UEM) <= 4 depending on the r/p production ratio.

References

1 : S. Jeon and V. Koch, Phys. Rev. Lett. 83 (1999) 5435; 85 (2000) 2076; M. Bleicher, S. Jeon and V. Koch, Phys. Rev. C 62 (2000) 061902.
2 : M. Martinis, V. Mikuta-Martinis, A. Švarc and J. Crnugelj, Fizika B 3 (1994) 197; M. Martinis, V. Mikuta-Martinis, A. Švarc and J. Crnugelj, Phys. Rev. D 51 (1995) 2482; M. Martinis, V. Mikuta-Martinis and J. Crnugelj, Phys. Rev. C 52 (1995) 1073.
3 : C. Blume, NA49 coll., Nucl.Phys. A698,(2002) 104c.
4 : CERES coll., J. Stachel, contribution to 2002 Epiphany Conf., Cracow, January 2002 (to be published in Acta Phys. Pol. B).