2009/06/30 by T. Koike, T. Harada, Toru Harada
Chemistry · Mathematics · Physics and Astronomy · #Bound state #Chemistry #Combinatorics #Crystallography #Energy (signal processing) #High-Energy Particle Collisions Research #Mathematical analysis #Mathematics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Spectral line #Upper and lower bounds #nucl-th
paper · pdf · doi:10.1103/physrevc.80.055208
published as Phys.Rev.C80:055208,2009 · 41 pages, 14 figures, accepted version for publication in Phys. Rev. C
arxiv created 2009/11/06 · openalex publication_date 2009/11/30 · openalex created_date 2019/12/13 · openalex updated_date 2026/08/05
The formation of a deeply bound K^\ensuremath-pp state with I=1/2, J^\ensuremathπ=0^\ensuremath-, by the 3He(in-flight K^\ensuremath-,n) reaction is theoretically investigated in a distorted-wave impulse approximation using the Green's function method. The expected inclusive and semiexclusive spectra at p_K^\ensuremath-=1.0 GeV/c and \ensuremathθlab=0^\ifmmode^∘\else\textdegree\fi are calculated for the forthcoming J-PARC E15 experiment. We demonstrate these spectra with several phenomenological K^\ensuremath--``pp'' optical potentials Uopt(E) that have an energy-dependent imaginary part multiplied by a phase space suppression factor, fitting to recent theoretical predictions or experimental candidates of the K^\ensuremath-pp bound state. The results show that a cusplike peak at the \ensuremathπ\ensuremathΣN threshold is a unique signal for the K^\ensuremath-pp bound state in the spectrum including the [K^\ensuremath-pp]\ensuremath→Y+N decay process from two-nucleon K^\ensuremath- absorption, as well as a distinct peak of the K^\ensuremath-pp bound state. The shape of the spectrum is explained by the trajectory of a moving pole of the K^\ensuremath-pp bound state in the complex energy plane. The importance of the [K^\ensuremath-pp]\ensuremath→Y+N spectrum to extract clear evidence of the K^\ensuremath-pp bound state is emphasized.