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Ground-state energy of pionic hydrogen to one loop

Gasser, J; Ivanov, MA; Lipartia, Edisher LU ; Mojzis, M and Rusetsky, A (2002) In European Physical Journal C. Particles and Fields 26(1). p.13-34
Abstract
We investigate the ground-state energy of the pi(-)p atom (pionic hydrogen) in the framework of QCD + QED. In particular, we evaluate the strong energy-level shift. We perform the calculation at next-to-leading order in the low-energy expansion in the framework of the relevant effective field theory. The result provides a relation between the strong energy shift and the pion-nucleon S-wave scattering lengths - evaluated in pure QCD - at next-to-leading order in isospin-breaking and in the low-energy expansion. We compare our result with available model calculations.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
26
issue
1
pages
13 - 34
publisher
Springer
external identifiers
  • wos:000179929000003
  • scopus:0036879281
ISSN
1434-6044
DOI
10.1007/s10052-002-1013-z
language
English
LU publication?
yes
id
4d549595-627f-49e1-9144-9a856f0796f0 (old id 321328)
date added to LUP
2007-08-20 14:33:09
date last changed
2017-12-10 04:38:00
@article{4d549595-627f-49e1-9144-9a856f0796f0,
  abstract     = {We investigate the ground-state energy of the pi(-)p atom (pionic hydrogen) in the framework of QCD + QED. In particular, we evaluate the strong energy-level shift. We perform the calculation at next-to-leading order in the low-energy expansion in the framework of the relevant effective field theory. The result provides a relation between the strong energy shift and the pion-nucleon S-wave scattering lengths - evaluated in pure QCD - at next-to-leading order in isospin-breaking and in the low-energy expansion. We compare our result with available model calculations.},
  author       = {Gasser, J and Ivanov, MA and Lipartia, Edisher and Mojzis, M and Rusetsky, A},
  issn         = {1434-6044},
  language     = {eng},
  number       = {1},
  pages        = {13--34},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {Ground-state energy of pionic hydrogen to one loop},
  url          = {http://dx.doi.org/10.1007/s10052-002-1013-z},
  volume       = {26},
  year         = {2002},
}