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How does the measurement of the phi-meson mass shift in nuclear matter constrain the strangeness content of the nucleon?

ECT* Seminar
Speaker: 

Philipp Gubler

Date: 
19 Nov 2014 - 11:15
Location: 
Villa Tambosi 2nd Floor, Seminar Room
Abstract: 

 In this seminar, I will present our latest results of our study on the behavior of the phi-meson at finite density [1], which makes  use of a QCD sum rule approach in combination with the maximum entropy  method [2]. As earlier works have already shown, we find a strong
 correlation between a possible mass shift of the phi-meson  in nuclear matter and the strangeness content of the nucleon, which is  proportional to the strange sigma term, sigma_{sN}=m_s*<N|bar[s}s|N>.  In contrast to other studies, we however find that, depending on the
 value of sigma_{sN}, the phi-meson could receive both a positive or  negative mass shift at nuclear matter density.  I will discuss the relevance of our results for the interpretation  of the E325 experiment, which was performed at KEK and for the future  E16 experiment to be carried out at the J-PARC facility.

 [1] P. Gubler and K. Ohtani, to be published in PRD, arXiv:1404.7701 [hep-ph].
 [2] P. Gubler and M. Oka, Prog. Theor. Phys. 124, 995 (2010), arXiv:1005.2459 [hep-ph].