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Ultra-Peripheral Collisions with gold ions in STAR | | Spencer R. Klein for the STAR Collaboration
; | | Date: |
Wed, 8 Jun 2016 20:55:47 GMT (1865kb,D) | | Abstract: | In 2010, the STAR Collaboration collected 38 million low-multiplicity
triggers for ultra-peripheral collision studies. We present new results
involving photonuclear interactions in ultra-peripheral relativistic heavy ion
collisions (UPCs), based on an analysis of 384,000 photoproduced pion pairs,
from $
ho$, $omega$ and direct $pi^+pi^-$ pair production.The $omega$
component is clearly visible through its interference with the $
ho$ peak. The
relative amplitudes of the three components have been measured, along with the
phase angle between the $
ho$ and $omega$ components.
Using a two-year (2010 and 2011) dataset, we explore higher mass final
states, and observe a $pi^+pi^-$ state with a mass of $1653 pm 10$ MeV and a
width of $164pm 15$ MeV (statistical errors only). The state is at least
roughly compatible with the $
ho_3(1690)$.
The $
ho^0$ squared momentum transfer ($t$) spectrum exhibits a spectrum
with both coherent and incoherent prodution. The coherent component shows two
characteristic diffraction minima, with positions that are sensitive to the
hadronic radius of the gold nucleus. | | Source: | arXiv, 1606.2754 | | Services: | Forum | Review | PDF | Favorites | |
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