New measurements of kaonic helium-4 L-series X-rays yields in gas with the SIDDHARTINO setup

Sirghi, D.; Shi, H. C.; Guaraldo, C.; Sgaramella, Francesco; Amsler, C.; Bosnar, D.; Bragadireanu, A. M.; Carminati, Marco; Cargnelli, M.; Clozza, A.; Deda, G.; Paolis, L. De; Grande, R. Del; Fabbietti, L.; Fiorini, C.; Iliescu, M.; Iwasaki, M.; Márton, J.; Miliucci, M.; Moskal, P.; Napolitano, F.; Niedźwiecki, Szymon; Ohnìshì, H.; Piscicchia, K.; Sada, Y.; Scordo, A.; Silarski, M.; Sirghi, F.; Skurzok, M.; Spallone, A.; Toho, K.; Tüchler, M.; Doce, O. Vázquez; Zmeskal, J.; Yoshida, Chihiro; Curceanu, C.

doi:10.1016/j.nuclphysa.2022.122567

Cited by 7 publications

(12 citation statements)

References 29 publications

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“…Our measurement of the x-ray yields for several M-series and L-series transitions in kaonic helium-4, provide new fundamental input to cascade models, potentially contributing to a deeper understanding of the de-excitation mechanisms within kaonic atoms. The measurement of the L α yield at the density of 1.37 ± 0.07 g l −1 , combined with the previous results obtained by SIDDHARTA [22] and SIDDHARTINO [19], offers a new opportunity to understand the density dependence of the kaonic helium yield. Moreover, the measurement of the 2p level energy shift and width improves the statistical accuracy by a factor three, compared to the previous results with gaseous helium-4, definitely rejecting the hypothesis of a large energy shift and width.…”

Section: Discussionmentioning

confidence: 80%

“…It is worth to underline that the results shown in table 3 represent the first experimental measurement of the M-series transitions yields, providing new experimental data to optimize the cascade models for kaonic helium and, more generally, kaonic atoms. Furthermore, the measurement of the L α x-ray yield at the density of 1.37 ± 0.07 g l −1 establishes a new experimental record and data point that, combined with the measurements performed by SIDDHARTA [22] and SIDDHARTINO [19], will allow to check and improve kaonic atoms cascade models across the density scale (see figure 5).…”

Section: The L and M-series Transitions X-ray Yieldsmentioning

confidence: 73%

“…The so-called kaonic 'helium puzzle' was solved by the E570 experiment at KEK [14], confirmed also by the SIDDHARTA experiment [15,16]. More recent and precise measurements have been performed at J-PARC by E62 [17], using a liquid helium target, and by the SIDDHARTA-2 collaboration, employing a gaseous one [18,19].…”

Section: Introductionmentioning

confidence: 92%

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First measurement of kaonic helium-4 M-series transitions

Sgaramella,

Sirghi,

Abbene

et al. 2024

J. Phys. G: Nucl. Part. Phys.

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In this paper we present the results of a new kaonic helium-4 measurement with a 1.37 g/l gaseous target by the SIDDHARTA-2 experiment at the DAΦNE collider. We measured, for the first time, the energies and yields of three transitions belonging to the M-series. Moreover, we improved by a factor about three, the statistical precision of the 2p level energy shift and width induced by the strong interaction, obtaining the most precise measurement for gaseous kaonic helium, and measured the yield of the Lα transition at the employed density, providing a new experimental input to investigate the density dependence of kaonic atoms transitions yield.

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Section: Discussionmentioning

confidence: 80%

Section: The L and M-series Transitions X-ray Yieldsmentioning

confidence: 73%

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First measurement of kaonic helium-4 M-series transitions

Sgaramella,

Sirghi,

Abbene

et al. 2024

J. Phys. G: Nucl. Part. Phys.

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“…More detailed information on the elements of the SIDDHARTA-2 apparatus can be found in [3,7]. The SIDDHARTINO experiment, consisting in a reduced SIDDHARTA-2 apparatus with only 64 SDDs installed, performed a precise measurement of gaseous K − -4 He transitions to the 2p level [8,9], thus confirming the expected performances, the excellent background rejection capacity of the SIDDHARTA-2 apparatus, and the validity of the data selection and analysis procedure [10].…”

Section: The Siddharta-2 Apparatusmentioning

confidence: 78%

The SIDDHARTA-2 experiment: preparation for the first kaonic deuterium measurement

Paolis¹,

Bosnar²,

Bragadireanu³

et al. 2022

Proceedings of 41st International Conference on High Energy Physics — PoS(ICHEP2022)

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The SIDDHARTA-2 experiment aims to perform the first measurement of the kaonic deuterium 2p → 1s x-ray transitions. The apparatus is presently installed at the interaction region of the DAΦNE electron-positron collider at the National Laboratories of Frascati (LNF-INFN), in Italy. Kaonic deuterium and kaonic hydrogen 2p → 1s x-ray transitions measurements, the latter one already performed by the SIDDHARTA collaboration, allow the determination of antikaon-nucleon scattering lengths. A description of the SIDDHARTA-2 apparatus in preparation for the kaonic deuterium measurement is provided in this paper.

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“…For a hypothetical reduction of the uncorrelated background by 70%, the Monte Carlo simulation predicts an improvement of the S/B by 43%. The background suppression provided by the Veto-2 system is crucial for the challenging kaonic deuterium measurement: the K 𝛼 X-ray yield in kaonic deuterium is expected to be lower by approximately two orders of magnitude with respect to the L 𝛼 yield in kaonic helium-4 [3][4][5][6]32]. Therefore, conserving the strength of the signal, together with an efficient suppression of correlated background, is vital for the success of the K − d measurement.…”

Section: Outlook: the Veto-2 Background Suppressionmentioning

confidence: 99%

The SIDDHARTA-2 Veto-2 system for X-ray spectroscopy of kaonic atoms at DAΦNE

Tüchler,

Amsler,

Bazzi

et al. 2023

J. Inst.

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The Veto-2 is a fundamental component of a multiple-stage veto system for the SIDDHARTA-2 experiment installed at the DAΦNE collider at INFN-LNF in Italy. It was developed to improve the signal-to-background ratio for the challenging measurement of X-ray transitions to the fundamental level in kaonic deuterium. Its purpose is the suppression of hadronic background in the form of Minimum Ionizing Particles by using the topological correlation between signals in the X-ray and Veto-2 detectors. The Veto-2 system consists of a barrel of plastic scintillators read out by Silicon Photomultipliers. The system performed its first successful test run within the apparatus with a helium-4 target in 2022. The efficiency of the Veto-2 was determined and found to be 0.62 ± 0.01. The Veto-2 improved the signal-to-background ratio for the kaonic helium-4 Lα measurement by ∼ 16%, which is crucial due to the low expected X-ray yield of kaonic deuterium.

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New measurements of kaonic helium-4 L-series X-rays yields in gas with the SIDDHARTINO setup

Cited by 7 publications

References 29 publications

First measurement of kaonic helium-4 M-series transitions

First measurement of kaonic helium-4 M-series transitions

The SIDDHARTA-2 experiment: preparation for the first kaonic deuterium measurement

The SIDDHARTA-2 Veto-2 system for X-ray spectroscopy of kaonic atoms at DAΦNE

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