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Changes in the properties of the vector mesons in hot and dense hadronicmatter, as produced in heavy ion collisions, lead to the intriguing possibilityof the opening of the decay channel $\omega \ra \rho \pi$, for the omega meson,which is impossible in free space. This along with the channel $\omega \pi \ra\pi \pi$ would result in a decrease in its effective life-time enabling it todecay within the hot zone and act as a chronometer in contradiction to thecommonly held opinion and would have implications vis a vis determination ofthe size of the region through pion interferometry. A new peak and a radicallyaltered shape of the low invariant mass dilepton spectra appears due todifferent shift in the masses of $\rho$ and $\omega$ mesons. The Walecka modelis used for the underlying calculation for the sake of illustration.Comment: To appear in Phys. ReV.

physical review. c. nuclear physics/physical review. c, nuclear physics

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ω</mml:mi></mml:math>meson as a chronometer and thermometer in hot and dense hadronic matter

ωmeson as a chronometer and thermometer in hot and dense hadronic matter