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1. Pole position of $\Lambda(1405)$ measured in $d(K^-,n)\pi\Sigma$ reactions

Author

Collaboration, J-PARC E31, Aikawa, S., Ajimura, S., Akaishi, T., Asano, H., Beer, G., Berucci, C., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishimoto, S., Ishikawa, T., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Komatsu, Y., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Omar, Z., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokiyasu, A. O., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez-Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Experiment
Abstract

We measured a set of $\pi^\pm\Sigma^\mp$, $\pi^0\Sigma^0$, and $\pi^-\Sigma^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrow\pi\Sigma$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $\pi\Sigma$ coupled channel. We find that a resonance pole corresponding to $\Lambda(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group., Comment: 8 pages, 5 figures

Published
2022

2. Pole position of $Λ(1405)$ measured in $d(K^-,n)πΣ$ reactions

Author

PARC E31 Collaboration, Aikawa, S., Ajimura, S., Akaishi, T., Asano, H., Beer, G., Berucci, C., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishimoto, S., Ishikawa, T., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Komatsu, Y., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Murayama, R., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Omar, Z., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokiyasu, A. O., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez-Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

We measured a set of $π^\pmΣ^\mp$, $π^0Σ^0$, and $π^-Σ^0$ invariant mass spectra below and above the $\bar{K}N$ mass threshold in $K^-$-induced reactions on deuteron. We deduced the $S$-wave $\bar{K}N\rightarrowπΣ$ and $\bar{K}N\rightarrow\bar{K}N$ scattering amplitudes in the isospin 0 channel in the framework of a $\bar{K}N$ and $πΣ$ coupled channel. We find that a resonance pole corresponding to $Λ(1405)$ is located at 1417.7$^{+6.0}_{-7.4}$(fitting errors)$^{+1.1}_{-1.0}$(systematic errors) + $[-26.1^{+6.0}_{-7.9}$(fitting errors)$^{+1.7}_{-2.0}$(systematic errors)]$i$ MeV/$c^2$, closer to the $\bar{K}N$ mass threshold than the value determined by the Particle Data Group., 8 pages, 5 figures

Published
2022
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3. Kaonic Deuterium Measurement with SIDDHARTA-2 on DA\Phi NE

Author

Curceanu, C., Amirkhani, A., Baniahmad, A., Bazzi, M., Bosnar, D., Bragadireanu, M., Carminati, M., Cargnelli, M., Clozza, A., De Paolis, L., Del Grande, R., Fabbietti, L., Fiorini, C., Ghio, F., Guaraldo, C., Iliescu, M., Iwasaki, M., Levi Sandri, P., Marton, J., Miliucci, M. Moskal, P., Niedźwiecki, S., Okada, S., Pietreanu, D., Piscicchia, K., Scordo, A., Shi, H., Silarski, M., Sirghi, D. L., Sirghi, F., Skurzok, M., Spallone, A., Tatsuno, H., Tüchler, M., Vazquez Doce, O., Widmann, E., and Zmeskal, J.

Subjects
Nuclear Theory, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, kaonic deuterium measurement, Nuclear Experiment
Abstract

The interaction of antikaons with nucleons and nuclei in the low-energy regime represents an active research field in hadron physics with still many important open questions. The investigation of light kaonic atoms is, in this context, a unique tool to obtain precise information on this interaction. The most precise kaonic hydrogen measurement to date, together with an exploratory measurement of kaonic deuterium, were carried out by the SIDDHARTA Collaboration at the DAΦNE electron– positron collider of LNF-INFN, by combining the excellent quality kaon beam delivered by the collider with new experimental techniques, as fast and precise Silicon-Drift X-ray detectors. The measurement of kaonic deuterium will be realized in the near future by SIDDHARTA-2, a major upgrade of SIDDHARTA.

Published
2020

4. Kaonic Deuterium Precision Measurement at DA(formula presented)NE: The SIDDHARTA-2 Experiment

Author

Miliucci, M., Amirkhani, A., Baniahmad, A., Bazzi, M., Bellotti, G., Berucci, C., Bosnar, D., Bragadireanu, M., Cargnelli, M., Curceanu, C., Dawood Butt, A., De Paolis, L., Del Grande, R., Fabbietti, L., Fiorini, C., Ghio, F., Guaraldo, C., Iliescu, M., Iwasaki, M., Levi Sandri, P., Marton, J., Moskal, P., Niedzwiecki, S., Okada, S., Pietreanu, D., Piscicchia, K., Scordo, A., Shi, H., Silarski, M., Sirghi, D., Sirghi, F., Skurzok, M., Spallone, A., Tatsuno, H., Vazquez Doce, O., Widmann, E., and Zmeskal, J.

Published
2020

5. Observation of a $\bar{K}NN$ bound state in the $^3{\rm He} (K^-, ��p)n$ reaction

Author

Yamaga, T., Ajimura, S., Asano, H., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwai, M., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We have performed an exclusive measurement of the $K^{-}+\! ~^{3}{\rm He} \to ��pn$ reaction at an incident kaon momentum of $1\ {\rm GeV}/c$.In the $��p$ invariant mass spectrum, a clear peak was observed below the mass threshold of $\bar{K}\!+\!N\!+\!N$, as a signal of the kaonic nuclear bound state, $\bar{K}NN$.The binding energy, decay width, and $S$-wave Gaussian reaction form-factor of this state were observed to be $B_{K} = 42\pm3({\rm stat.})^{+3}_{-4}({\rm syst.})\ {\rm MeV}$, $��_{K} = 100\pm7({\rm stat.})^{+19}_{-9}({\rm syst.})\ {\rm MeV}$, and $Q_{K} = 383\pm11({\rm stat.})^{+4}_{-1}({\rm syst.})\ {\rm MeV}/c$, respectively. The total production cross-section of $\bar{K}NN$, determined by its $��p$ decay mode, was $��^{tot}_{K} \cdot BR_{��p} = 9.3\pm0.8({\rm stat.})^{+1.4}_{-1.0}({\rm syst.})\ ��{\rm b}$.We estimated the branching ratio of the $\bar{K}NN$ state to the $��p$ and $��^{0}p$ decay modes as $BR_{��p}/BR_{��^{0}p} \sim 1.7$, by assuming that the physical processes leading to the $��N\!N$ final states are analogous to those of $��pn$., 13 pages, 12 figures

Published
2020
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6. ' ', a -meson Nuclear Bound State, Observed in He( ,λ ) Reactions

Author

Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R.S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Vazquez Doce, O., Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Abstract

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”.

Published
2019

7. '$\mathbf{{\textit K^-}{\textit p}{\textit p}}$', a ${\overline{K}}$-Meson Nuclear Bound State, Observed in $^{3}{\rm He}({K^-}, {\Lambda} p)n$ Reactions

Author

collaboration, J-PARC E15, Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Subjects
Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract

We observed a distinct peak in the $\Lambda p$ invariant mass spectrum of $^{3}{\rm He}(K^-, \, \Lambda p)n$, well below the mass threshold of $m_K + 2 m_p$. By selecting a relatively large momentum-transfer region $q = 350 \sim 650$ MeV/$c$, one can clearly separate the peak from the quasi-free process, $\overline{K}N \rightarrow \overline{K}N$ followed by the non-resonant absorption by the two spectator-nucleons $\overline{K}NN \rightarrow \Lambda N $. We found that the simplest fit to the observed peak gives us a Breit-Wigner pole position at $B_{\rm {\it Kpp}} = 47 \pm 3 \, (stat.) \,^{+3}_{-6} \,(sys.)$ MeV having a width $\Gamma_{\rm {\it Kpp}} = 115 \pm 7 \, (stat.) \,^{+10}_{-9} \,(sys.)$ MeV, and the $S$-wave Gaussian reaction form-factor parameter $Q_{\rm {\it Kpp}} = 381 \pm 14 \, (stat.)\,^{+57}_{-0} \,(sys.)$ MeV/$c$, as a new form of the nuclear bound system with strangeness -- "$K^-pp$"., Comment: 17 pages, 4 figures

Published
2018

8. '$\mathbf{{\textit K^-}{\textit p}{\textit p}}$', a ${\overline{K}}$-Meson Nuclear Bound State, Observed in $^{3}{\rm He}({K^-}, �� p)n$ Reactions

Author

PARC E15 Collaboration, Ajimura, S., Asano, H., Beer, G., Berucci, C., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Itahashi, K., Iwasaki, M., Kanno, K., Kato, K., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Sada, Y., Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Shirotori, K., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Yamaga, T., Yamazaki, T., Zhang, Q., and Zmeskal, J.

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex)
Abstract

We observed a distinct peak in the $��p$ invariant mass spectrum of $^{3}{\rm He}(K^-, \, ��p)n$, well below the mass threshold of $m_K + 2 m_p$. By selecting a relatively large momentum-transfer region $q = 350 \sim 650$ MeV/$c$, one can clearly separate the peak from the quasi-free process, $\overline{K}N \rightarrow \overline{K}N$ followed by the non-resonant absorption by the two spectator-nucleons $\overline{K}NN \rightarrow ��N $. We found that the simplest fit to the observed peak gives us a Breit-Wigner pole position at $B_{\rm {\it Kpp}} = 47 \pm 3 \, (stat.) \,^{+3}_{-6} \,(sys.)$ MeV having a width $��_{\rm {\it Kpp}} = 115 \pm 7 \, (stat.) \,^{+10}_{-9} \,(sys.)$ MeV, and the $S$-wave Gaussian reaction form-factor parameter $Q_{\rm {\it Kpp}} = 381 \pm 14 \, (stat.)\,^{+57}_{-0} \,(sys.)$ MeV/$c$, as a new form of the nuclear bound system with strangeness -- "$K^-pp$"., 17 pages, 4 figures

Published
2018
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9. First application of superconducting transition-edge-sensor microcalorimeters to hadronic-atom x-ray spectroscopy

Author

Okada, S., Bennett, D. A., Curceanu, C., Doriese, W. B., Fowler, J. W., Gard, J., Gustafsson, F. P., Hashimoto, T., Hayano, R. S., Hirenzaki, S., Hays-Wehle, J. P., Hilton, G. C., Ikeno, N., Iliescu, M., Ishimoto, S., Itahashi, K., Iwasaki, M., Koike, T., Kuwabara, K., Ma, Y., Marton, J., Noda, H., O'Neil, G. C., Outa, H., Reintsema, C. D., Sato, M., Schmidt, D. R., Shi, H., Suzuki, K., Suzuki, T., Swetz, D. S., Tatsuno, H., Uhlig, J., Ullom, J. N., Widmann, E., Yamada, S., Yamagata-Sekihara, J., and Zmeskal, J.

Subjects
Nuclear Theory (nucl-th), Physics - Instrumentation and Detectors, Nuclear Theory, Atomic Physics (physics.atom-ph), Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics - Atomic Physics
Abstract

High-resolution pionic-atom x-ray spectroscopy was performed with an x-ray spectrometer based on a 240-pixel array of superconducting transition-edge-sensor (TES) microcalorimeters at the piM1 beam line of the Paul Scherrer Institute. X-rays emitted by pionic carbon via the 4f->3d transition and the parallel 4d->3p transition were observed with a full-width-at-half-maximum energy resolution of 6.8 eV at 6.4 keV. Measured x-ray energies are consistent with calculated electromagnetic values which considered the strong-interaction effect assessed via the Seki-Masutani potential for the 3p energy level, and favor the electronic population of two filled 1s electrons in the K-shell. Absolute energy calibration with an uncertainty of 0.1 eV was demonstrated under a high-rate hadron beam condition of 1.45 MHz. This is the first application of a TES spectrometer to hadronic-atom x-ray spectroscopy and is an important milestone towards next-generation high-resolution kaonic-atom x-ray spectroscopy., 11 pages, 3 figures, submitted to PTEP

Published
2016

10. Structure near $K^-$+$p$+$p$ threshold in the in-flight $^3$He$(K^-,\Lambda p)n$ reaction

Author

Collaboration, J-PARC E15, Sada, Y., Ajimura, S., Bazzi, M., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Faso, D., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Vidal, A. Romero, Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Wuenschek, B. K., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
High Energy Physics::Experiment, Nuclear Experiment
Abstract

To search for an S= -1 di-baryonic state which decays to $\Lambda p$, the $ {\rm{}^3He}(K^-,\Lambda p)n_{missing}$ reaction was studied at 1.0 GeV/$c$. Unobserved neutrons were kinematically identified from the missing mass $M_X$ of the $ {\rm{}^3He}(K^-,\Lambda p)X$ reaction in order to have a large acceptance for the $\Lambda pn$ final state. The observed $\Lambda p n$ events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the $\Lambda p$. To account for the observed peak structure, the simplest S-wave pole was assumed to exist in the reaction channel, having Breit-Wigner form in energy and with a Gaussian form-factor. A minimum $\chi^2$ method was applied to deduce its mass $M_X\ =$ 2355 $ ^{+ 6}_{ - 8}$ (stat.) $ \pm 12$ (syst.) MeV/c$^2$, and decay-width $\Gamma_X\ = $ 110 $ ^{+ 19}_{ - 17}$ (stat.) $ \pm 27$ (syst.) MeV/c$^2$, respectively. The form factor parameter $Q_X \sim$ 400 MeV/$c$ implies that the range of interaction is about 0.5, Comment: 12pages, 8 figures

Published
2016

11. Structure near $K^-$+$p$+$p$ threshold in the in-flight $^3$He$(K^-,��p)n$ reaction

Author

PARC E15 Collaboration, Sada, Y., Ajimura, S., Bazzi, M., Beer, G., Bhang, H., Bragadireanu, M., Buehler, P., Busso, L., Cargnelli, M., Choi, S., Curceanu, C., Enomoto, S., Faso, D., Fujioka, H., Fujiwara, Y., Fukuda, T., Guaraldo, C., Hashimoto, T., Hayano, R. S., Hiraiwa, T., Iio, M., Iliescu, M., Inoue, K., Ishiguro, Y., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Kato, Y., Kawasaki, S., Kienle, P., Kou, H., Ma, Y., Marton, J., Matsuda, Y., Mizoi, Y., Morra, O., Nagae, T., Noumi, H., Ohnishi, H., Okada, S., Outa, H., Piscicchia, K., Vidal, A. Romero, Sakaguchi, A., Sakuma, F., Sato, M., Scordo, A., Sekimoto, M., Shi, H., Sirghi, D., Sirghi, F., Suzuki, K., Suzuki, S., Suzuki, T., Tanida, K., Tatsuno, H., Tokuda, M., Tomono, D., Toyoda, A., Tsukada, K., Doce, O. Vazquez, Widmann, E., Wuenschek, B. K., Yamaga, T., Yamazaki, T., Yim, H., Zhang, Q., and Zmeskal, J.

Subjects
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

To search for an S= -1 di-baryonic state which decays to $��p$, the $ {\rm{}^3He}(K^-,��p)n_{missing}$ reaction was studied at 1.0 GeV/$c$. Unobserved neutrons were kinematically identified from the missing mass $M_X$ of the $ {\rm{}^3He}(K^-,��p)X$ reaction in order to have a large acceptance for the $��pn$ final state. The observed $��p n$ events, distributed widely over the kinematically allowed region of the Dalitz plot, establish that the major component comes from a three nucleon absorption process. A concentration of events at a specific neutron kinetic energy was observed in a region of low momentum transfer to the $��p$. To account for the observed peak structure, the simplest S-wave pole was assumed to exist in the reaction channel, having Breit-Wigner form in energy and with a Gaussian form-factor. A minimum $��^2$ method was applied to deduce its mass $M_X\ =$ 2355 $ ^{+ 6}_{ - 8}$ (stat.) $ \pm 12$ (syst.) MeV/c$^2$, and decay-width $��_X\ = $ 110 $ ^{+ 19}_{ - 17}$ (stat.) $ \pm 27$ (syst.) MeV/c$^2$, respectively. The form factor parameter $Q_X \sim$ 400 MeV/$c$ implies that the range of interaction is about 0.5, 12pages, 8 figures

Published
2016
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12. Measurements of the strong-interaction widths of the kaonic 3He and 4He 2p levels

Author

The SIDDHARTA Collaboration, Bazzi, M., Beer, G., Bombelli, L., Bragadireanu, A. M., Cargnelli, M., Curceanu, C., d'Uffizi, A., Fiorini, C., Frizzi, T., Ghio, F., Guaraldo, C., Hayano, R. S., Iliescu, M., Ishiwatari, T., Iwasaki, M., Kienle, P., Sandri, P. Levi, Longoni, A., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Rizzo, A., Vidal, A. Romero, Sbardella, E., Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Doce, O. Vazquez, Wunschek, B., Widmann, E., and Zmeskal, J.

Subjects
Physics, Nuclear and High Energy Physics, X-ray spectroscopy, sezele, 010308 nuclear & particles physics, Strong interaction, Low-energy QCD, FOS: Physical sciences, Kaonic atoms, Antikaon–nucleon physics, 01 natural sciences, Article, Nuclear physics, 0103 physical sciences, Nuclear Experiment (nucl-ex), Atomic physics, 010306 general physics, Nuclear Experiment, Value (mathematics)
Abstract

The kaonic 3He and 4He X-rays emitted in the 3d-2p transitions were measured in the SIDDHARTA experiment. The widths of the kaonic 3He and 4He 2p states were determined to be Gamma_2p(3He) = 6 \pm 6 (stat.) \pm 7 (syst.) eV, and Gamma_2p(4He) = 14 \pm 8 (stat.) \pm 5 (syst.) eV, respectively. Both results are consistent with the theoretical predictions. The width of kaonic 4He is much smaller than the value of 55 \pm 34 eV determined by the experiments performed in the 70's and 80's, while the width of kaonic 3He was determined for the first time., Comment: Accepted in Phys. Lett. B

Published
2012

13. Precision measurement of the 3d→2p x-ray energy in kaonic 4He

Author

Okada, S., Beer, G., Bhang, H., Cargnelli, M., Chiba, J., Choi, Seonho, Curceanu, C., Fukuda, Y., Hanaki, T., Hayano, R.S., Iio, M., Ishikawa, T., Ishimoto, S., Ishiwatari, T., Itahashi, K., Iwai, M., Iwasaki, M., Juhász, B., Kienle, P., Marton, J., Matsuda, Y., Ohnishi, H., Outa, H., Sato, M., Schmid, P., Suzuki, S., Suzuki, T., Tatsuno, H., Tomono, D., Widmann, E., Yamazaki, T., Yim, H., and Zmeskal, J.

Subjects
Nuclear and High Energy Physics
Published
2007
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14. Low-energy kaon-nucleon/nuclei interaction studies at DAΦNE by AMADEUS

Author

Tucaković, I., Bazzi, M., Berucci, C., Bosnar, D., Bragadireanu, A. M., Cargnelli, M., Clozza, A., Curceanu, C., D'Uffizi, A., Fabbietti, L., Fiorini, CARLO ETTORE, Ghio, F., Guaraldo, C., Iliescu, M., Ishiwatari, T., Levi Sandri, P., Marton, J., Ietreanu, D., Piscicchia, K., Poli Lener, M., Quaglia, Riccardo, Sbardella, E., Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Doce, O., Vazquez, Widmann, E., and Zmeskal, J.

Subjects
Particle physics, QC1-999, Hadron, Nuclear Theory, Physics and Astronomy (all), sezele, Strangeness, 01 natural sciences, law.invention, Nuclear physics, Physics and Astronomy (all), Low energy, law, 0103 physical sciences, Cluster (physics), 010306 general physics, Collider, Nuclear Experiment, Physics, Quantum chromodynamics, sezele, 010308 nuclear & particles physics, kaon-nuclei hadronic interaction, non-perturbative QCD, kaonic clusters, Interaction studies, High Energy Physics::Experiment, Nucleon
Abstract

The AMADEUS experiment deals with the investigation of the low-energy kaon-nuclei hadronic interaction at the DAΦNE collider at LNF-INFN, fundamental to respond to longstanding open questions in the non-perturbative QCD in the strangeness sector. One of the most interesting aspects is to understand how hadron masses and interactions change in the nuclear environment. The antikaon-nucleon potential is investigated searching for signals from possible bound kaonic clusters, which would imply a strongly attractive antikaon-nucleon potential. AMADEUS step 0 consists in the analysis of 2004/2005 KLOE data, exploring K − absorptions in H , 4 He , 9 Be and 12 C present in setup materials. The status of the various preliminary analyses is presented, together with future perspectives.

Published
2015

15. Strangeness in the Universe? Advances and perspectives in the low-energy kaon-nucleon/nuclei interaction studies at the DA${\Phi}$NE collider

Author

Curceanu, C., Bazzi, M., Ghio, F., Guaraldo, C., Hayano, R. S., Iliescu, M., Ishiwatari, T., Iwasaki, M., Levi Sandri, P., Marton, J., Okada, S., Pietreanu, D., Beer, G., Piscicchia, K., Poli Lener, M., Ponta, T., Quaglia, R., Romero Vidal, A., Sbardella, E., Schembari, F., Scordo, A., Shi, H., Sirghi, D. L., Berucci, C., Tatsuno, H., Tucakovic, I., Vazquez Doce, O., Widmann, E., Zmeskal, J., Bosnar, D., Bragadireanu, A. M., Cargnelli, M., d'Uffizi, A., Fabietti, L., and Fiorini, C.

Subjects
electron positron, Lambda(1405), Physics, atom, Nuclear Theory, formation, interaction [nucleus], K nucleon, beam [K], Frascati Stor, strangeness, nuclear physics, quality, low [energy], Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Contribution to Proceedings, Proc. of PANIC 2014, 269 - 272; DESY-PROC-2014-02; ISSN 1435-8077

Published
2014

16. Investigation of the low energy kaons hadronic interactions in light nuclei by AMADEUS

Author

Piscicchia K., Bazzi M., Berucci C., Bosnar D., Bragadireanu A.M., Cargnelli M., Clozza A., D’Uffizi A., Fabietti L., Fiorini C., Ghio F., Guaraldo C., Iliescu M., Ishiwatari T., Levi Sandri P., Marton J., Pietreanu D., Poli Lener M., Quaglia R., Sbardella E., Scordo A., Shi H., Sirghi D.L., Sirghi F., Tatsuno H., Tucaković I., Vazquez Doce O., Widmann E., and Zmeskal J.

Subjects
Physics and Astronomy (all), sezele, Physics, QC1-999, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, lcsh:Physics, lcsh:QC1-999
Abstract

The AMADEUS experiment has the aim to perform studies of the low energy hadronic interactions of negatively charged kaons with nucleons and nuclei, which are fundamental to solve longstanding open questions in the non-perturbative QCD in the strangeness sector. The DAΦNE collider provides a unique source of monochromatic low-momentum kaons, whose nuclear interaction with the materials of the KLOE detector (used as an active target) provide us excellent acceptance and resolution data for K− capture on H, 4He, 9Be and 12C, both at-rest and in-flight. AMADEUS step 0 consisted in the analysis of the 2004-2005 KLOE data. A second step consisted in the implementation in the central region of the KLOE detector of a pure graphite target, providing a high statistic sample of K− 12C nuclear captures at rest. For the future, new setups for various dedicated targets are under preparation. The aim of such investigations is to face the major open questions in hadron nuclear physics in the strangeness sector, such as the nature of the Λ(1405) state and the resonant versus non-resonant yield in nuclear K− capture, the possible existence of kaonic nuclear clusters, strongly related to a quantitative understanding of single versus multi-nucleon K− absorption.

Published
2014

17. Studies of the K¯N interaction at DAΦNE

Author

Vázquez Doce, O., Bazzi, M., Berucci, C., Bombelli, Luca, Bragadireanu, A. M., Cargnelli, M., Clozza, A., Curceanu, C., D’Uffizi, A., Fiorini, CARLO ETTORE, Ghio, F., Guaraldo, C., Iliescu, M., Ishiwatari, T., Levi Sandri, P., Longoni, ANTONIO FRANCESCO, Marton, J., Okada, S., Pietreanu, D., Piscicchia, K., Poli Lener, M., Ponta, T., Rizzo, A., Romero Vidal, A., Sbardella, E., Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Widmann, E., and Zmeskal, J.

Subjects
sezele
Published
2012

18. Precision spectroscopy of light kaonic atom X-rays in the SIDDHARTA experiment

Author

Cargnelli, M., Bazzi, M., Beer, G., Bombelli, Luca, Bragadireanu, A. M., Curceanu, C., Fiorini, CARLO ETTORE, Frizzi, Tommaso, Ghio, F., Girolami, B., Guaraldo, C., Hayano, R., Iliescu, M., Ishiwatari, T., Iwasaki, M., Kienle, P., Lechner, P., Levi Sandri, P., Longoni, ANTONIO FRANCESCO, Lucherini, V., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Romero Vidal, A., Scordo, A., Shi, H. X., Sirghi, D. L., Sirghi, F., Soltau, H., Strüder, L., Tatsuno, H., Vazquez Doce, O., Widmann, E., and Zmeskal, J.

Subjects
sezele
Published
2011

19. First measurement of kaonic helium-3 X-rays

Author

SIDDHARTA Collaboration, Bazzi, M., Beer, G., Bombelli, L., Bragadireanu, A. M., Cargnelli, M., Corradi, G., Curceanu, C., d'Uffzi, A., Fiorini, C., Frizzi, T., Ghio, F., Girolami, B., Guaraldo, C., Hayano, R. S., Iliescu, M., Ishiwatari, T., Iwasaki, M., Kienle, P., Sandri, P. Levi, Longoni, A., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Rizzo, A., Vidal, A. Romero, Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Doce, O. Vazquez, Widmann, E., Wuenschek, B., and Zmeskal, J.

Subjects
Nuclear and High Energy Physics, Meson, Silicon, Kaonic hydrogen, Physics::Instrumentation and Detectors, Strong interaction, Nuclear Theory, chemistry.chemical_element, FOS: Physical sciences, 01 natural sciences, Article, law.invention, Nuclear physics, Silicon drift detectors, law, Helium-3, 0103 physical sciences, Atom, Physics::Atomic Physics, Nuclear Experiment (nucl-ex), 010306 general physics, Collider, Nuclear Experiment, Exotic atom, Physics, sezele, 010308 nuclear & particles physics, Kaonic helium, chemistry, Exotic atoms, High Energy Physics::Experiment, Atomic physics
Abstract

The first observation of the kaonic 3He 3d - 2p transition was made using slow K- mesons stopped in a gaseous 3He target. The kaonic atom X-rays were detected with large-area silicon drift detectors using the timing information of the K+K- pairs of phi-meson decays produced by the DAFNE e+e- collider. The strong interaction shift of the kaonic 3He 2p state was determined to be -2+-2 (stat)+-4 (syst) eV., Comment: Accepted for publication in Phys. Lett. B

Published
2010
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20. Kaonic helium X-ray measurement in SIDDHARTA

Author

Bazzi, M., Beer, G., Bombelli, Luca, Bragadireanu, A. M., Cargnelli, M., Corradi, G., Curceanu, C., D'Uffizi, A., Fiorini, CARLO ETTORE, Frizzi, Tommaso, Ghio, F., Girolami, B., Guaraldo, C., Hayano, R. S., Iliescu, M., Ishiwatari, T., Iwasaki, M., Kienle, P., Levi Sandri, P., Longoni, ANTONIO FRANCESCO, Lucherini, V., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Rizzo, A., Romero Vidal, A., Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Vazquez Doce, O., Widmann, E., and Zmeskal, J.

Subjects
sezele
Published
2009

21. Strong-interaction shifts and widths of kaonic helium isotopes

Author

Ishiwatari, T., Bazzi, M., Beer, G., Bombelli, L., Bragadireanu, A.M., Cargnelli, M., Curceanu (Petrascu), C., dʼUffizi, A., Fiorini, C., Frizzi, T., Ghio, F., Guaraldo, C., Hayano, R.S., Iliescu, M., Iwasaki, M., Kienle, P., Levi Sandri, P., Longoni, A., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Rizzo, A., Romero Vidal, A., Sbardella, E., Scordo, A., Shi, H., Sirghi, D.L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Vazquez Doce, O., Widmann, E., Wünschek, B., and Zmeskal, J.

Subjects
Nuclear and High Energy Physics, sezele, Exotic atoms, Silicon-drift detectors, Strong interaction, Physics::Atomic Physics, Kaonic helium, Article
Abstract

The kaonic 3He and 4He 3d→2p transitions in gaseous targets were observed by the SIDDHARTA experiment. The X-ray energies of these transitions were measured with large-area silicon-drift detectors using the timing information of the K+K− pairs produced by the DAΦNE e+e− collider. The strong-interaction shifts and widths both of the kaonic 3He and 4He 2p states were determined, which are much smaller than the results obtained by the previous experiments. The “kaonic helium puzzle” (a discrepancy between theory and experiment) was now resolved.

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22. Kaonic helium (3 and 4) precision X-ray transitions measurements by SIDDHARTA at DAΦNE

Author

Scordo, A., Bazzi, M., Beer, G., Bombelli, L., Bragadireanu, A. M., Cargnelli, M., Clozza, A., Corradi, G., Curceanu Petrascu, C., D Uffizi, A., Fiorini, C., Frizzi, T., Ghio, F., Girolami, B., Guaraldo, C., Hayano, R. S., Iliescu, M., Ishiwatari, T., Iwasaki, M., Kienle, P., Levi Sandri, P., Longoni, A., Marton, J., Okada, S., Pietreanu, D., Pischicchia, K., Ponta, T., Rizzo, A., Romero Vidal, A., Sbardella, E., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Vazquez Doce, O., Widmann, E., Wünschek, B., and Zmeskal Johann

23. Precision spectroscopy of light kaonic atom X-rays in the SIDDHARTA experiment

Author

Ishiwatari, T., 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. S., Iliescu, M., Iwasaki, M., Kienle, P., Sandri, P. Levi, Longoni, A., Lucherini, V., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Rizzo, A., Vidal, A. Romero, Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Doce, O. Vazquez, Widmann, E., Zmeskal, J., Nieves, Jm, Oset, E., and Vacas, Mjv

Subjects
sezele

24. Kaonic atoms at DAΦNE

Author

Okada, S., Bazzi, M., Beer, G., Berucci, C., Bombelli, L., Bragadireanu, A. M., Cargnelli, M., Clozza, A., Corradi, G., Curceanu, C., D Uffizi, A., Fiorini, C., Ghio, F., Girolami, B., Guaraldo, C., Hayano, R. S., Mihail Antoniu Iliescu, Ishiwatari, T., Iwasaki, M., Kienle, P., Sandri, P. L., Lucherini, V., Marton, J., Pietreanu, D., Piscicchia, K., Lener, M. P., Ponta, T., Quaglia, R., Rizzo, A., Vidal, A. R., Sbardella, E., Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Doce, O. V., Widmann, E., and Zmeskal, J.

25. Investigating low energy QCD with kaonic atoms: The SIDDHARTA experiment at DAΦNE

Author

Scordo, A., Bazzi, M., Beer, G., Bombelli, L., Bragadireanu, A. M., Cargnelli, M., Clozza, A., Curceanu, C., D’uffizi, A., Fiorini, C., Frizzi, T., Ghio, F., Girolami, B., Guaraldo, C., Hayano, R. S., Iliescu, M., Ishiwatari, T., Masahiko Iwasaki, Kienle, P., Levi Sandri, P., Longoni, A., Marton, J., Okada, S., Pietreanu, D., Pischicchia, K., Ponta, T., Rizzo, A., Romero Vidal, A., Sbardella, E., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Vazquez Doce, O., Widmann, E., Wünschek, B., and Zmeskal, J.

26. Kaonic atoms measurements at DAΦNE by SIDDHARTA

Author

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. S., Mihail Antoniu Iliescu, Ishiwatari, T., Iwasaki, M., Kienle, P., Levi Sandri, P., Longoni, A., Lucherini, V., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Rizzo, A., Romero Vidal, A., Scordo, A., Shi, H., Sirghi, D. L., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Vázquez Doce, O., Widmann, E., and Zmeskal, J.

27. Kaonic Helium 3 and 4 measurements by the SIDDHARTA experiment at DAΦNE

Author

Sirghi, D. L., Bazzi, M., Beer, G., Bombelli, L., Bragadireanu, A. M., Cargnelli, M., Corradi, G., Curceanu, C., D Uffizi, A., Fiorini, C., Frizzi, T., Ghio, F., Guaraldo, C., Hayano, R. S., Mihail Antoniu Iliescu, Ishiwatari, T., Iwasaki, M., Kienle, P., Levi Sandri, P., Longoni, A., Lucherini, V., Marton, J., Okada, S., Pietreanu, D., Ponta, T., Rizzo, A., Romero Vidal, A., Scordo, A., Shi, H., Sirghi, F., Tatsuno, H., Tudorache, A., Tudorache, V., Vazquez Doce, O., Widmann, E., and Zmeskal, J.

28. KAONIC ATOMS AT DA Phi NE - THE SIDDHARTA EXPERIMENT

Author

Zmeskal, J., Bazzi, M., Beer, G., Bombelli, L., Bragadireanu, A. M., Buehler, P., Cargnelli, M., Curceanu, C., Fiorini, C., Guaraldo, C., Hayano, R. S., Iliescu, M., Ishiwatari, T., Iwasaki, M., Kienle, P., Longoni, A., Lucherini, V., Marton, J., Nikolics, K., Okada, S., Pietreanu, D., Ponta, T., Vidal, A. Romero, Sandri, P. L., Scordo, A., Sirghi, D. L., Sirghi, F., Suzuki, K., Tatsuno, H., Doce, O. Vazquez, and Eberhard Widmann

Subjects
sezele

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