Pi- p atom in ChPT: Strong energy level shift - INSPIRE

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Pi- p atom in ChPT: Strong energy level shift

Valery E. Lyubovitskij
(
- Tubingen U. and
- Tomsk State U.
)
,
A. Rusetsky
(
- Bern U. and
- Tbilisi State U.
)

Sep, 2000

16 pages

Published in:

Phys.Lett.B 494 (2000) 9-18

e-Print:

hep-ph/0009206 [hep-ph]

DOI:

10.1016/S0370-2693(00)01185-0

Report number:

BUTP-2000-18

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Abstract:

The general formula of the pi(-)p atom strong energy-level shift in the 1s state is derived in the next-to-leading order in the isospin breaking, and in all orders in chiral expansion. Isospin-breaking corrections to the level shift are explicitly evaluated at order p^2 in ChPT. The results clearly demonstrate the necessity to critically reaccess the values of the piN scattering lengths, extracted from the energy-level shift measurement by means of the potential model-based theoretical analysis.

03.65.Ge
03.65.Nk
11.10.St
12.39.Fe
13.40.Ks
Hadronic atoms
Non-relativistic effective Lagrangians
Chiral Perturbation Theory
pi- p: bound state
hydrogen: mesic atom

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