Two-flavor simulations of ρ(770) and the role of the KK¯ channel

Hu, B.; Molina, R.; Döring, M.; Alexandru, A.

doi:10.1103/PhysRevLett.117.122001

Two-flavor simulations of $ρ (770)$ and the role of the $K \bar{K}$ channel

Journal Article · Thu Sep 15 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.122001· OSTI ID:1325513

Hu, B. ^[1]; Molina, R. ^[1]; Döring, M. ^[2]; Alexandru, A. ^[1]

The George Washington Univ., Washington, D.C. (United States)
The George Washington Univ., Washington, D.C. (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Here, the ρ(770) meson is the most extensively studied resonance in lattice QCD simulations in two (N_f = 2) and three (N_f = 2 + 1) flavor formulations. We analyze N_f = 2 lattice scattering data using unitarized chiral perturbation theory, allowing not only for the extrapolation in mass but also in flavor, N_f = 2 → N_f = 2 + 1. The flavor extrapolation requires information from a global fit to ππ and πK phase shifts from experiment. While the chiral extrapolation of N_f = 2 lattice data leads to masses of the ρ(770) meson far below the experimental one, we find that the missing KK¯ channel is able to explain this discrepancy.

View Accepted Manuscript (DOE)

Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-06OR23177; FG02-95ER40907

OSTI ID:: 1325513

Alternate ID(s):: OSTI ID: 1324860

Report Number(s):: DOE/OR/23177--3907; JLAB-THY--16-2316; arXiv:1605.04823

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 117; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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