Quantum Calculation of the Collision-Induced Line-Shape Effects in Antiprotonic Helium and the New Accurate Ab Initio p̅He+ –He Potential Energy Surface
Hubert J. Jóźwiak, Dimitar Bakalov, Michał Przybytek, Michail Stoilov, Piotr Wcisło
TL;DR
This paper calculates how helium atoms affect the spectral lines of antiprotonic helium, using new quantum methods to improve precision in measuring fundamental symmetries.
Contribution
The paper introduces a new ab initio potential energy surface and quantum framework for studying antiprotonic helium with high accuracy.
Findings
A new potential energy surface was developed for p̅He+–He interactions.
Quantum scattering calculations provided pressure broadening and shift coefficients for 50 transitions in p̅4He+.
The results support high-precision spectroscopy for testing CPT symmetry and determining pion and kaon masses.
Abstract
We present the first fully ab initio calculations of collision-induced broadening and shift of spectral lines in antiprotonic helium (p̅He+) perturbed by atomic helium. To overcome critical limitations of previous studies, we construct a new highly accurate potential energy surface (PES) that spans a wide range of p̅He+ –He geometries relevant to all metastable states of the exotic helium atom. Rigorous quantum scattering calculations performed using the new PES yield scattering S-matrices from which we extract pressure broadening and shift coefficients for 50 transitions in antiprotonic helium-4 (p̅4He+) . This data set provides the first rigorous benchmark for earlier semiclassical calculations and establishes a robust theoretical reference for high-precision spectroscopy of antiprotonic helium, which is used to test the fundamental charge, parity, and time reversal (CPT)…
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Taxonomy
TopicsHigh-pressure geophysics and materials · Quantum, superfluid, helium dynamics · Atomic and Molecular Physics