منابع مشابه
Pionic Hydrogen at Psi
The measurement of the pion–nucleon scattering lengths constitutes a high–precision test of the methods of Chiral Pertubation Theory (χPT), which is the low–energy approach of QCD. The πN s–wave scattering lengths are related to the strong–interaction shift ǫ1s and width Γ1s of the s–states of the pionic hydrogen atom. ǫ1s and Γ1s are determined from the measured energies and line widths of X–r...
متن کاملGround-state energy of pionic hydrogen to one loop
We investigate the ground-state energy of the π−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 scatterin...
متن کاملNew deeply bound pionic states in Sn isotopes
M. Fujita, H. Geissel, H. Gilg, A. Gillitzer, R.S. Hayano, S. Hirenzaki, K. Itahashi, M. Iwasaki, P. Kienle, L. Maier, M. Matos, G. Münzenberg, T. Ohtsubo, M. Sato, M. Shindo, K. Suzuki, T. Suzuki, H. Weick, M. Winkler, T. Yamazaki, T. Yoneyama Nara Women’s University, GSI Darmstadt, Technische Universität München, Forschungszentrum Jülich University of Tokyo, Tokyo Institute of Technology, Nii...
متن کاملCoulomb deexcitation of pionic hydrogen within close-coupling method
The Coulomb deexcitation of (πp) atom in collisions with the hydrogen atom has been studied in the fully quantum mechanical close-coupling approach for the first time. The total Coulomb deexcitation cross-sections of nl → n′l′ transitions and l-averaged cross-sections are calculated for n = 3 − 8 and at the relative energies E = 0.01 − 100 eV. The strong interaction and vacuum polarization shif...
متن کاملSignificance of Negative Energy States in Quantum Field Theory (1)
We suppose that there are both particles with negative energies described by LW and particles with positive energies described by LF , L = LF + LW , LF is equivalent to Lagragian density of the conventional QED, LW and LF are symmetric, independent of each other before quantization and dependent on each other after quantization. From this we define transfomation operators and quantize free fiel...
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ژورنال
عنوان ژورنال: Acta Physica Polonica
سال: 2022
ISSN: ['2082-7865', '1899-2358']
DOI: https://doi.org/10.5506/aphyspolbsupp.15.2-a2