Ground-state energy of pionic hydrogen to one loop
(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.
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/321328
- author
- Gasser, J ; Ivanov, MA ; Lipartia, Edisher LU ; Mojzis, M and Rusetsky, A
- organization
- publishing date
- 2002
- 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
- 2024-02-27 09:55:31
@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}}, }