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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
; ; ; and
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
2016-04-01 16:57:56
date last changed
2022-12-12 22:42:01
@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}},
  doi          = {{10.1007/s10052-002-1013-z}},
  volume       = {{26}},
  year         = {{2002}},
}