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- W3133024080 abstract "Abstract The hadronic width of the ground state of pionic hydrogen has been redetermined by X-ray spectroscopy to be $$varGamma ^{pi mathrm {H}}_{1s}=(856,pm ,16_mathrm{stat},pm ,22_mathrm{sys})$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:msubsup> <mml:mi>Γ</mml:mi> <mml:mrow> <mml:mn>1</mml:mn> <mml:mi>s</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>π</mml:mi> <mml:mi>H</mml:mi> </mml:mrow> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mrow> <mml:mo>(</mml:mo> <mml:mn>856</mml:mn> <mml:mspace /> <mml:mo>±</mml:mo> <mml:mspace /> <mml:msub> <mml:mn>16</mml:mn> <mml:mi>stat</mml:mi> </mml:msub> <mml:mspace /> <mml:mo>±</mml:mo> <mml:mspace /> <mml:msub> <mml:mn>22</mml:mn> <mml:mi>sys</mml:mi> </mml:msub> <mml:mo>)</mml:mo> </mml:mrow> </mml:mrow> </mml:math> meV. The experiment was performed at the high-intensity low-energy pion beam of the Paul Scherrer Institute by using the cyclotron trap and a high-resolution Bragg spectrometer with spherically bent crystals. Coulomb de-excitation was studied in detail by comparing its influence on the line shape by measuring the three different transitions K $$alpha $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>α</mml:mi> </mml:math> , K $$beta $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>β</mml:mi> </mml:math> , and K $$gamma $$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mi>γ</mml:mi> </mml:math> at various hydrogen densities. The pion-nucleon scattering lengths and other physical quantities extracted from pionic-atom data are in good agreement with the results obtained from pion-nucleon and nucleon-nucleon scattering experiments and confirm that a consistent picture is achieved for the low-energy pion-nucleon sector with respect to the expectations of chiral perturbation theory." @default.
- W3133024080 created "2021-03-01" @default.
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- W3133024080 date "2021-02-01" @default.
- W3133024080 modified "2023-10-16" @default.
- W3133024080 title "Redetermination of the strong-interaction width in pionic hydrogen" @default.
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