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“K−pp” a K‾-meson n...
“K−pp” a K‾-meson nuclear bound state, observed in 3He(K−,Λp)n reactions
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- Ajimura, S. (författare)
- Osaka University
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- Tatsuno, H. (författare)
- Lund University,Lunds universitet,Kemisk fysik,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Chemical Physics,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Zmeskal, J. (författare)
- Stefan Meyer Institute for Subatomic Physics (SMI)
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(creator_code:org_t)
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- Elsevier BV, 2019
- 2019
- Engelska 6 s.
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Ingår i: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. - : Elsevier BV. - 0370-2693. ; 789, s. 620-625
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Abstract
Ämnesord
Stäng
- We observed a distinct peak in the Λp invariant mass spectrum of He3(K−,Λp)n, well below mK+2mp, i.e., the mass threshold of the K− to be bound to two protons. By selecting a relatively large momentum-transfer region q=350∼650 MeV/c, one can kinematically separate the peak from the quasi-free process, K‾N→K‾N followed by the non-resonant absorption by the two spectator-nucleons K‾NN→ΛN. We found that the simplest fit to the observed peak gives us a Breit–Wigner pole position at BKpp=47±3(stat.)−6 +3(sys.) MeV having a width ΓKpp=115±7(stat.)−20 +10(sys.) MeV, and the S-wave Gaussian reaction form-factor parameter QKpp=381±14(stat.)−0 +57(sys.) MeV/c, as a new form of the nuclear bound system with strangeness – “K−pp”.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Nyckelord
- Kaon
- Mesonic nuclear bound state
- Strangeness
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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