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Measurement of the Kaonic Hydrogen X-Ray Spectrum

G. BeerDepartment of Physics and Astronomy, University of Victoria, P. O. Box 3055, Victoria, British Columbia V8W 3P6, CanadaA.M. BragadireanuInstitute of Physics and Nuclear Engineering “Horia Hulubei”, Particle Physics Department, IFIN-HH, P.O. Box MG-6, R-76900 Magurele, Bucharest, RomaniaM. CargnelliStefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, AustriaC. Curceanu-PetrascuLaboratori Nazionali di Frascati, INFN, C. P. 13, Via E. Fermi 40, I-00044 Frascati, ItalyJ.‐P. EggerInstitut de Physique, Université de Neuchâtel, 1 rue A. -L. Breguet, CH-2000 Neuchâtel, SwitzerlandH. FuhrmannStefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, AustriaC. GuaraldoLaboratori Nazionali di Frascati, INFN, C. P. 13, Via E. Fermi 40, I-00044 Frascati, ItalyM. IliescuInstitute of Physics and Nuclear Engineering “Horia Hulubei”, Particle Physics Department, IFIN-HH, P.O. Box MG-6, R-76900 Magurele, Bucharest, RomaniaT. IshiwatariStefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, AustriaK. ItahashiInstitute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, JapanM. IwasakiInstitute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, JapanP. KienleStefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, AustriaT. KoikeInstitute of Physical and Chemical Research (RIKEN), Wako-shi, Saitama, 351-0198, JapanB. LaussDepartment of Physics, University of California, 366 LeConte Hall, Berkeley, California 94720, USAV. LucheriniLaboratori Nazionali di Frascati, INFN, C. P. 13, Via E. Fermi 40, I-00044 Frascati, ItalyL. LudhováInstitut de Physique, Université de Fribourg, CH-1700 Fribourg, SwitzerlandJ. MártonStefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, AustriaF. MulhauserInstitut de Physique, Université de Fribourg, CH-1700 Fribourg, SwitzerlandT. PontaInstitute of Physics and Nuclear Engineering “Horia Hulubei”, Particle Physics Department, IFIN-HH, P.O. Box MG-6, R-76900 Magurele, Bucharest, RomaniaL. A. SchallerInstitut de Physique, Université de Fribourg, CH-1700 Fribourg, SwitzerlandR. SekiDepartment of Physics and Astrophysics, California State University, Northridge, California 91330, USAD. SirghiInstitute of Physics and Nuclear Engineering “Horia Hulubei”, Particle Physics Department, IFIN-HH, P.O. Box MG-6, R-76900 Magurele, Bucharest, RomaniaF. SirghiLaboratori Nazionali di Frascati, INFN, C. P. 13, Via E. Fermi 40, I-00044 Frascati, ItalyJ. ZmeskalStefan Meyer Institut für subatomare Physik, Austrian Academy of Sciences, Boltzmanngasse 3, A-1090 Vienna, Austria

2005en

ABI

Annotatsiya

The DEAR (DA$\ensuremath{\Phi}$NE exotic atom research) experiment measured the energy of x rays emitted in the transitions to the ground state of kaonic hydrogen. The measured values for the shift $ϵ$ and the width $\ensuremath{\Gamma}$ of the 1$s$ state due to the ${K}^{\ensuremath{-}}p$ strong interaction are ${ϵ}_{1s}=\ensuremath{-}193\ifmmode\pm\else\textpm\fi{}37$ (stat) $\ifmmode\pm\else\textpm\fi{}6$ (syst) eV and ${\ensuremath{\Gamma}}_{1s}=249\ifmmode\pm\else\textpm\fi{}111$ (stat) $\ifmmode\pm\else\textpm\fi{}30$ (syst) eV, the most precise values yet obtained. The pattern of the kaonic hydrogen $K$-series lines, ${K}_{\ensuremath{\alpha}}$, ${K}_{\ensuremath{\beta}}$, and ${K}_{\ensuremath{\gamma}}$, was disentangled for the first time.

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DOI: 10.1103/physrevlett.94.212302

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