A new measurement of kaonic hydrogen X-rays

Bazzi, M.; Beer, G.; Bombelli, L.; Bragadireanu, A. M.; Cargnelli, M.; Corradi, G.; Curceanu, C.; D’Uffizi, A.; Fiorini, C.; Frizzi, T.; Ghio, F.; Girolami, B.; Guaraldo, C.; Hayano, R.; Iliescu, M.; Ishiwatari, T.; Iwasaki, M.; Kienle, Paul; Sandri, P. Levi; Longoni, A.; Lucherini, V.; Márton, J.; Okada, S.; Pietreanu, D.; Ponta, T.; Rizzo, A.; Vidal, A. Romero; Scordo, A.; Shi, H.; Sirghi, D.; Sirghi, F.; Tatsuno, H.; Tudorache, A.; Tudorache, V.; Doce, O. Vázquez; Widmann, E.; Zmeskal, J.

doi:10.1016/j.physletb.2011.09.011

Cited by 370 publications

(377 citation statements)

References 44 publications

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“…At threshold, the precise measurement of strong-interaction level shift and width of the 1s state in the kaonic atom of hydrogen by the SIDDHARTA collaboration [1,2] provides an important constraint on the K − p interaction, in addition to three previously known threshold branching ratios. However, as shown recently [3,4] the resulting K − N scattering amplitudes appear to be strongly model dependent when extrapolating to energies below threshold and also with respect to their pole content.…”

Section: Introductionmentioning

confidence: 99%

K−N amplitudes below threshold constrained by multinucleon absorption

Friedman¹,

Gal²

2017

Nuclear Physics A

123

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Six widely different subthreshold K − N scattering amplitudes obtained in SU(3) chiral-model EFT approaches by fitting to low-energy and threshold data are employed in optical-potential studies of kaonic atoms. Phenomenological terms representing K − multinucleon interactions are added to the EFT-inspired single-nucleon part of the K − -nucleus optical potential in order to obtain good fits to kaonic-atom strong-interaction level shifts and widths across the periodic table. Introducing as a further constraint the fractions of single-nucleon K − absorption at rest from old bubble-chamber experiments, it is found that only two of the models considered here reproduce these absorption fractions. Within these two models, the interplay between single-nucleon and multinucleon K − interactions explains features observed previously with fully phenomenological optical potentials. Radial sensitivities of kaonic atom observables are re-examined, and remarks are made on the role of 'subthreshold kinematics' in absorption-at-rest calculations.

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Section: Introductionmentioning

confidence: 99%

K−N amplitudes below threshold constrained by multinucleon absorption

Friedman¹,

Gal²

2017

Nuclear Physics A

123

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“…In the experimental spectrum, backgrounds are also shown: (BG accidental ) accidental hits in the NC, (BG cell ) reactions on the target cell, (BG neutral ) γ-ray mainly from π 0 andK decays, and (BG Σ−decay ) a neutron from forward going Σ ± decay. To generate the simulated spectrum, known elementary K − N reaction processes [40] were simulated taking account of detector resolution, acceptance, efficiencies, and Fermi motion in 3 He [41]. Here, K − "p ′′ and K − "n ′′ reactions are assumed to be the relative cross section of 2 : 1 to simulate the reactions on 3 He target.…”

Section: Semi-inclusive 3 He(k − N)x Measurementmentioning

confidence: 99%

“…To generate the simulated spectrum, known elementary K − N reaction processes [40] were simulated taking account of detector resolution, acceptance, efficiencies, and Fermi motion in 3 He [41]. Here, K − "p ′′ and K − "n ′′ reactions are assumed to be the relative cross section of 2 : 1 to simulate the reactions on 3 He target. Both in the spectra, the quasi-elastic scattering (K − "n ′′ → K − n) and the charge-exchange reaction (K − "p ′′ → K 0 S n) are clearly seen, whose cross section were evaluated to be ∼ 6 and ∼ 11 mb/sr using the data-set, respectively.…”

Section: Semi-inclusive 3 He(k − N)x Measurementmentioning

confidence: 99%

“…The missing neutron was identified kinematically. The contamination from reactions on materials other than the 3 He target was estimated to be less than 2% of the inclusive Λp events, and furthermore it becomes negligible by focusing on the final state Λpn because of kinematical conservation. Figure 4 (a) and (b) show the Λp invariant-mass and the 3 He(K − , Λp)X missing-mass spectra, respectively.…”

Section: Exclusive 3 He(k − λ P)n Measurementmentioning

confidence: 99%

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\(\bar{K}NN\) Bound State Search at J-PARC

Sakuma

2017

Proceedings of the 14th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU2016)

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An experimental search for the simplest kaonic nuclear bound state,KNN, has been performed by using the in-flight K − + 3 He reactions at 1.0 GeV/c (J-PARC E15). The experiment investigates thē KNN state both in the formation via missing-mass spectroscopy and its decay via invariant-mass spectroscopy using the emitted neutron and the expected decayKNN → Λp, respectively. A large yield below the mass threshold of K − + p + p has been observed in the semi-inclusive 3 He(K − , n)X spectrum, but no significant structure has been seen in the deeply bound region. With the exclusive 3 He(K − , Λp)n analysis, a significant bump structure around the mass threshold has been observed in the Λp invariant-mass spectrum. The possible existence of theKNN states is discussed by combining the formation-and the decay-channel analyses. KEYWORDS:KN interaction,KNN bound-state, J-PARC IntroductionExtensive measurements of the anti-kaonic hydrogen atom [1-3] and low-energyKN scattering [4] have revealed the strongly attractiveKN interaction above theKN-mass threshold. As a consequence of the strongly attractiveKN interaction in I = 0 channels, the possible existence of strongly-boundK nuclear-states has been widely discussed [5][6][7][8]. The investigation of those exotic states will provide unique information of theKN interaction below the threshold, which is still not fully understood up to date. Furthermore, the grate interest of those exotic states is that they might form high-density nuclear matter where the chiral symmetry is expected to be restored [5,[8][9][10]. Thus the investigation of theK nuclear-states will give us the new insights on not only meson-baryon interactions in low-energy quantum chromodynamics (QCD) but also the change of the interaction in nuclear media.Among theK nuclear-states, the simplestK-nuclear cluster,KNN, is of special interest because it is the lightest S = -1K nucleus; the state is expected as [K ⊗ NN I=0,S =0 ] I=1/2 with J P = 0 − . For thē KNN system, many theoretically works based on a few-body calculation using theKNN −πΣN −πΛN coupled-channels have been performed and predicted the existence of the bound state. However, the calculated properties of the bound state, such as the binding energy (B.E.) and the decay width (Γ), strongly depend onKN interaction models. For the energy-independent models (phenomenological models), the binding energy is predicted to be ∼ 40-90 MeV [6,[11][12][13][14][15], whereas, it becomes ∼ 10-20 MeV for the energy-dependent cases (chiral SU(3) models) [7,[16][17][18][19]. With the chiral model, a double pole structure of theKNN is also proposed in relation to Λ(1405) [20]. As for the decay widths, the predicted values widely spread over ∼ 30-110 MeV, too. Such divergence is attributed mainly from difference of theKN potential below theKN-mass threshold.Experimentally, there are several reports on observation of peak structure with the B.E. of ∼ 100 MeV. The FINUDA collaboration at DAΦNE measured the stopped K − reaction on 6 Li, 7 Li, and 12 C targets, and observe...

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“…In our fits we employ elastic and inelastic cross section data for different two body channels and the precise SIDDHARTA value of the energy shift and width of kaonic hidrogen, as well as, the branching ratios at threshold [11][12][13][14]. Since the lowest-order Lagrangian does not contribute directly to these reactions, one can expect that they will be especially sensitive to the NLO terms.…”

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confidence: 99%

The Role of High Spin Hyperon Resonances in the Ξ Production Meson-Baryon Reactions

Feijoo

Magas

Ramos

2017

Proceedings of the 12th International Conference on Hypernuclear and Strange Particle Physics (HYP2015)

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The Chiral SU(3) lagrangian extended to next-to-leading order (NLO) in the framework of coupledchannels has been used to study the meson-baryon interaction in S-wave in the strangeness S = −1 sector. A large set of experimental data in different two-body channels has been employed to fit the low energy constants of the lagrangian, paying special attention to theKN → KΞ reaction, which is particularly sensitive to the NLO terms. The reproduction of the structures present in the cross sections of the KΞ channels, as well as their differential cross sections, has been improved by taking into account the high spin hyperonic resonances by means of a phenomenological model.

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A new measurement of kaonic hydrogen X-rays

Cited by 370 publications

References 44 publications

K−N amplitudes below threshold constrained by multinucleon absorption

K−N amplitudes below threshold constrained by multinucleon absorption

\(\bar{K}NN\) Bound State Search at J-PARC

The Role of High Spin Hyperon Resonances in the Ξ Production Meson-Baryon Reactions

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