Evidence for a Kaon-Bound State K−pp Produced in K− Absorption Reactions at Rest
Year: 2005
Type: article
Abstract: We have searched for a deeply bound kaonic state by using the FINUDA spectrometer installed at the ${e}^{+}{e}^{\ensuremath{-}}$ collider $\mathrm{DA}\ensuremath{\Phi}\mathrm{NE}$. Almost monochromatic ${K}^{\ensuremath{-}}$'s produced through the decay of $\ensuremath{\phi}(1020)$ mesons are used to observe ${K}^{\ensuremath{-}}$ absorption reactions stopped on very thin nuclear targets. Taking this unique advantage, we have succeeded to detect a kaon-bound state ${K}^{\ensuremath{-}}pp$ through its two-body decay into a $\ensuremath{\Lambda}$ hyperon and a proton. The binding energy and the decay width are determined from the invariant-mass distribution as ${115}_{\ensuremath{-}5}^{+6}(\mathrm{stat}{)}_{\ensuremath{-}4}^{+3}(\mathrm{syst})\text{ }\mathrm{MeV}$ and ${67}_{\ensuremath{-}11}^{+14}(\mathrm{stat}{)}_{\ensuremath{-}3}^{+2}(\mathrm{syst})\text{ }\mathrm{MeV}$, respectively.
Source: Physical Review Letters
Authors: M. Agnello, G. Beer, L. Benussi, M. Bertani, S. Bianco, E. Botta, T. Bressani, L. Busso, D. Calvo, P. Camerini, P. Cerello, B. Dalena, F. De Mori, G. D’Erasmo, D. Di Santo, F. L. Fabbri, D. Faso, A. Feliciello, A. Filippi, V. Filippini, E. M. Fiore, H. Fujioka, P. Gianotti, N. Grion, V. Lucherini, S. Marcello, T. Maruta, N. Mirfakhrai, O. Morra, T. Nagae, A. Olin, H. Outa, E. Pace, M. Palomba, A. Pantaleo, A. Panzarasa, V. Paticchio, S. Piano, F. Pompili, R. Rui, G. Simonetti, H. So, S. Tomassini, A. Toyoda, R. Wheadon, A. Zenoni
Institutions: Politecnico di Torino, Istituto Nazionale di Fisica Nucleare, Sezione di Torino, University of Victoria, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, University of Turin, University of Trieste, Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Istituto Nazionale di Fisica Nucleare, Sezione di Bari, University of Bari Aldo Moro, Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, The University of Tokyo, Shahid Beheshti University, High Energy Accelerator Research Organization, TRIUMF, RIKEN, Seoul National University, University of Brescia
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2108404396