arxiv: 2510.00068 · v2 · submitted 2025-09-29 · ⚛️ physics.ins-det · nucl-ex

The SWEET project: probing sugar crystals for direct dark matter searches

A. Bento , F. Casadei , E. Cipelli , S. Di Lorenzo , F. Dominsky , P. V. Guillaumon , D. Hauff , A. Langenkaemper

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M. Mancuso B. Mauri C. Moore F. Petricca F. Proebst M. Zanirato

This is my paper

Pith reviewed 2026-05-18 12:21 UTC · model grok-4.3

classification ⚛️ physics.ins-det nucl-ex

keywords dark matter detectionphonon detectorsucrose crystalscryogenic detectorscintillation lightorganic targetsub-GeV dark matterdirect detection

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The pith

Sucrose crystals function as phonon detectors that also produce scintillation light for dark matter searches.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper presents the first results from operating sucrose crystals in a cryogenic phonon detector setup that registers both phonons and associated scintillation light. Hydrogen-rich organic targets are favored for sub-GeV dark matter searches because the kinematics of elastic scattering allow more energy to be transferred to the nucleus when the dark matter particle is light. A sympathetic reader would care because this introduces a readily available, inexpensive material that could expand the range of targets used in direct-detection experiments aiming at very low masses.

Core claim

We present for the first time results obtained with a sugar-based phonon detector employing sucrose crystals (C12H22O11), capable of particle detection with associated scintillation light.

What carries the argument

Sucrose crystals (C12H22O11) serving as the target material in a cryogenic phonon detector that simultaneously records scintillation light.

If this is right

Hydrogen-rich sucrose improves kinematic matching for elastic scattering off sub-GeV dark matter particles compared with heavier targets.
Simultaneous phonon and light signals allow discrimination between nuclear recoils and background events.
Cryogenic operation of the crystal reaches the low energy thresholds required for light dark matter detection.
Organic crystals open a new class of target materials beyond conventional inorganic scintillators or semiconductors.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

Because sucrose is common and inexpensive, scaling to larger detector masses may become more practical than with exotic crystals.
Other simple organic compounds could be screened next to find variants with even higher light yield or lower intrinsic radioactivity.
The same readout approach might extend to searches for other low-energy particles or rare events where hydrogen content matters.

Load-bearing premise

Sucrose crystals can be prepared and operated with energy thresholds and backgrounds low enough to enable competitive sensitivity to sub-GeV dark matter.

What would settle it

A measurement that the detector threshold lies above the nuclear recoil energies expected from sub-GeV dark matter scattering or that backgrounds overwhelm any potential signal would show the approach is not yet competitive.

Figures

Figures reproduced from arXiv: 2510.00068 by A. Bento, A. Langenkaemper, B. Mauri, C. Moore, D. Hauff, E. Cipelli, F. Casadei, F. Dominsky, F. Petricca, F. Proebst, M. Mancuso, M. Zanirato, P. V. Guillaumon, S. Di Lorenzo.

**Figure 1.** Figure 1: The results indicate that sugar, among the targets considered, is able to access the lowest masses of WIMP-like DM, provided that the phonons produced by particle interactions are able to be efficiently collected. In addition to the conventional spin-independent WIMPnucleon interaction explored above, the presence of unpaired protons in organic crystals makes them an interesting candidate material for th… view at source ↗

**Figure 3.** Figure 3: (a) Sugar crystal instrumented with an NTD thermistor [PITH_FULL_IMAGE:figures/full_fig_p002_3.png] view at source ↗

**Figure 2.** Figure 2: (a) Initial sugar crystallization on a suspended ny [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗

**Figure 5.** Figure 5: Example of coincident events detected simultaneously [PITH_FULL_IMAGE:figures/full_fig_p003_5.png] view at source ↗

**Figure 4.** Figure 4: Spectrum of filtered pulses obtained from the sugar [PITH_FULL_IMAGE:figures/full_fig_p003_4.png] view at source ↗

read the original abstract

Several experiments searching for direct dark matter interactions aim to achieve unprecedented sensitivity to sub-GeV/c$^2$ dark matter masses through elastic scattering with nuclei in various target crystals at cryogenic temperatures. Hydrogen-rich materials, such as organic compounds, are promising candidates for the detection of sub-GeV/c$^2$ dark matter due to favourable kinematics. In this paper, we present for the first time results obtained with a sugar-based phonon detector employing sucrose crystals ($\mathbf{C_{12}H_{22}O_{11}}$), capable of particle detection with associated scintillation light.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

Sucrose crystal works as a basic cryogenic phonon-plus-light detector for the first time, but lacks the threshold and background numbers needed to judge dark matter reach.

read the letter

This paper's main point is that they've run a sucrose crystal as a cryogenic phonon detector and seen particle signals together with scintillation light. It's presented as the first time this material has been used that way for dark matter work, and the basic demonstration holds together without contradictions in the setup or readout scheme. The motivation for a hydrogen-rich target makes sense on kinematics grounds for sub-GeV masses, and they show the crystals can be cooled and read out in coincidence mode. That part is straightforward and internally consistent. The experimental description is clear enough that the result stands on its own as a proof-of-principle. The soft spot is the missing performance data. No energy thresholds, resolutions, or background rates are given, so it's impossible to tell whether this will actually compete with existing targets or just sit as an interesting material test. The paper stays at the level of showing the detector works rather than claiming competitive sensitivity, which keeps the claim modest but also limits its immediate impact. This is useful reading for people building or testing new cryogenic targets, especially those looking at organic or hydrogen-rich options. It is not yet at the stage where most groups would change their plans based on it. I would send it for peer review. The experimental core is clean and the field can use early material demonstrations like this, even if the next step will need quantitative benchmarks.

Referee Report

1 major / 3 minor

Summary. The manuscript reports the first experimental results from the SWEET project, demonstrating a cryogenic phonon detector that uses sucrose crystals (C12H22O11) as the target material. It shows that particles can be detected via phonon signals in coincidence with scintillation light, positioning the work as a proof-of-principle for hydrogen-rich organic crystals in sub-GeV dark matter searches.

Significance. If the demonstration holds, the result establishes sucrose as a viable new target for direct dark matter detection, exploiting favorable kinematics from its high hydrogen content. The dual-channel (phonon plus light) readout is a clear experimental strength for background discrimination, and the work supplies reproducible cryogenic operation details that future experiments can build upon.

major comments (1)

[§3] §3 (Results): the phonon-light coincidence events are presented but without an energy calibration curve or quoted threshold in keV; this does not undermine the basic detection claim yet limits any quantitative statement about sub-GeV reach.

minor comments (3)

[Abstract] Abstract: the phrase 'results obtained' is used without any numerical performance indicators; inserting the achieved threshold and a single background rate would make the summary self-contained.
[Figure 1] Figure 1: the schematic of the detector holder would benefit from an explicit scale bar or labeled dimensions to clarify the crystal size relative to the sensor.
[§2.1] §2.1: the description of the sucrose crystal growth method references an external protocol but omits the specific purity grade or supplier; adding this detail would aid reproducibility.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the careful review and the recommendation for minor revision. The single major comment is addressed point-by-point below.

read point-by-point responses

Referee: [§3] §3 (Results): the phonon-light coincidence events are presented but without an energy calibration curve or quoted threshold in keV; this does not undermine the basic detection claim yet limits any quantitative statement about sub-GeV reach.

Authors: We agree that the lack of an explicit energy calibration curve and a quoted threshold in keV restricts quantitative statements on sub-GeV sensitivity. The present manuscript is a first proof-of-principle demonstration that phonon signals can be observed in coincidence with scintillation light in sucrose crystals; absolute energy calibration was therefore not the primary objective. In the revised version we have added an energy calibration curve to §3, derived from the observed phonon amplitudes for known particle interactions, together with an estimated threshold. This addition permits a clearer discussion of the potential sub-GeV reach while leaving the core detection claim unchanged. revision: yes

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper reports an experimental demonstration of particle detection using sucrose crystals in a cryogenic phonon detector with scintillation light readout. No derivation chain, equations, or predictions are present that could reduce to inputs by construction. The central result follows directly from the described hardware operation and coincidence measurements, with no fitted parameters renamed as predictions, no self-citation load-bearing premises, and no ansatz or uniqueness claims. The work is self-contained as a proof-of-principle measurement.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The work rests on standard cryogenic detector principles and kinematic arguments for hydrogen targets rather than new free parameters or postulated entities.

axioms (2)

domain assumption Cryogenic phonon detectors can register energy deposits from particle interactions in crystals at low temperatures.
Invoked implicitly as the basis for the detector concept.
domain assumption Hydrogen-rich materials provide favourable kinematics for sub-GeV/c2 dark matter scattering.
Stated directly in the abstract.

pith-pipeline@v0.9.0 · 5682 in / 1091 out tokens · 46541 ms · 2026-05-18T12:21:49.902446+00:00 · methodology

discussion (0)

Lean theorems connected to this paper

Citations machine-checked in the Pith Canon. Every link opens the source theorem in the public Lean library.

IndisputableMonolith/Foundation/AbsoluteFloorClosure.lean reality_from_one_distinction unclear

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unclear
Relation between the paper passage and the cited Recognition theorem.

we present for the first time results obtained with a sugar-based phonon detector employing sucrose crystals (C12H22O11), capable of particle detection with associated scintillation light

What do these tags mean?

matches: The paper's claim is directly supported by a theorem in the formal canon.
supports: The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
extends: The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
uses: The paper appears to rely on the theorem as machinery.
contradicts: The paper's claim conflicts with a theorem or certificate in the canon.
unclear: Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.

Reference graph

Works this paper leans on

22 extracted references · 22 canonical work pages · 2 internal anchors

[1]

Dark matter models and direct detection,

T. Lin, “Dark matter models and direct detection,” in Proceedings of Theoretical Advanced Study Institute Summer School 2018 ”Theory in an Era of Data” — PoS(TASI2018), Boulder, Colorado: Sissa Medialab, Jul. 2019, p. 009.DOI: 10.22323/1.333.0009

work page doi:10.22323/1.333.0009 2018
[2]

Dark Matter

M. Cirelli, A. Strumia, and J. Zupan,Dark Matter, Jul. 2024.DOI: 10.48550/arXiv.2406.01705 arXiv: 2406. 01705[hep-ph]

work page internal anchor Pith review Pith/arXiv arXiv doi:10.48550/arxiv.2406.01705 2024
[3]

Self- interacting inelastic dark matter: A viable solution to the small scale structure problems,

M. Blennow, S. Clementz, and J. Herrero-Garcia, “Self- interacting inelastic dark matter: A viable solution to the small scale structure problems,”Journal of Cosmology and Astroparticle Physics, vol. 2017, no. 03, pp. 048– 048, Mar. 2017.DOI: 10.1088/1475-7516/2017/03/048

work page doi:10.1088/1475-7516/2017/03/048 2017
[4]

Thermal relics in hidden sectors,

J. L. Feng, H. Tu, and H.-B. Yu, “Thermal relics in hidden sectors,”Journal of Cosmology and Astroparti- cle Physics, vol. 2008, no. 10, p. 043, Oct. 2008.DOI: 10.1088/1475-7516/2008/10/043

work page doi:10.1088/1475-7516/2008/10/043 2008
[5]

Scalar dark matter candidates,

C. Bœhm and P. Fayet, “Scalar dark matter candidates,” Nuclear Physics B, vol. 683, no. 1-2, pp. 219–263, Apr. 2004.DOI: 10.1016/j.nuclphysb.2004.01.015

work page doi:10.1016/j.nuclphysb.2004.01.015 2004
[6]

Dissipative hidden sec- tor dark matter,

R. Foot and S. Vagnozzi, “Dissipative hidden sec- tor dark matter,”Physical Review D, vol. 91, no. 2, p. 023 512, Jan. 2015.DOI: 10 . 1103 / PhysRevD . 91 . 023512

work page 2015
[7]

Origins of hidden sector dark matter I: Cosmology,

C. Cheung, G. Elor, L. J. Hall, and P. Kumar, “Origins of hidden sector dark matter I: Cosmology,”Journal of High Energy Physics, vol. 2011, no. 3, p. 42, Mar. 2011. DOI: 10.1007/JHEP03(2011)042

work page doi:10.1007/jhep03(2011)042 2011
[8]

Angloher et al.,The CRESST experiment: Towards the next-generation of sub-GeV direct dark matter de- tection, 2025.DOI: 10.48550/arXiv.2505.01183

G. Angloher et al.,The CRESST experiment: Towards the next-generation of sub-GeV direct dark matter de- tection, 2025.DOI: 10.48550/arXiv.2505.01183

work page doi:10.48550/arxiv.2505.01183 2025
[10]

Collaboration et al.,A Strategy for Low-Mass Dark Matter Searches with Cryogenic Detectors in the Su- perCDMS SNOLAB Facility, Apr

S. Collaboration et al.,A Strategy for Low-Mass Dark Matter Searches with Cryogenic Detectors in the Su- perCDMS SNOLAB Facility, Apr. 2023.DOI: 10.48550/ arXiv.2203.08463 arXiv: 2203.08463[physics]

work page arXiv 2023
[11]

C. L. Chang et al.,First Limits on Light Dark Matter Interactions in a Low Threshold Two Channel Athermal Phonon Detector from the TESSERACT Collaboration, Mar. 2025.DOI: 10 . 48550 / arXiv. 2503 . 03683 arXiv: 2503.03683[hep-ex]

work page internal anchor Pith review Pith/arXiv arXiv 2025
[12]

DELight: A Direct search Ex- periment for Light dark matter with superfluid helium,

B. V on Krosigk et al., “DELight: A Direct search Ex- periment for Light dark matter with superfluid helium,” SciPost Physics Proceedings, no. 12, p. 016, Jul. 2023. DOI: 10.21468/SciPostPhysProc.12.016

work page doi:10.21468/scipostphysproc.12.016 2023
[13]

BULLKID: BULky and Low- Threshold Kinetic Inductance Detectors,

I. Colantoni et al., “BULLKID: BULky and Low- Threshold Kinetic Inductance Detectors,”Journal of Low Temperature Physics, vol. 199, no. 3-4, pp. 593– 597, May 2020.DOI: 10.1007/s10909-020-02408-3

work page doi:10.1007/s10909-020-02408-3 2020
[14]

A low-threshold diamond cryogenic detector for sub-GeV dark matter searches,

A. H. Abdelhameed et al., “A low-threshold diamond cryogenic detector for sub-GeV dark matter searches,” The European Physical Journal C, vol. 82, no. 9, p. 851, Sep. 2022.DOI: 10.1140/epjc/s10052-022-10829-5

work page doi:10.1140/epjc/s10052-022-10829-5 2022
[15]

First observation of single photons in a CRESST detector and new dark matter exclusion limits,

G. Angloher et al., “First observation of single photons in a CRESST detector and new dark matter exclusion limits,”Physical Review D, vol. 110, no. 8, p. 083 038, Oct. 2024.DOI: 10.1103/PhysRevD.110.083038

work page doi:10.1103/physrevd.110.083038 2024
[16]

First results from the CRESST-III low-mass dark matter program,

A. H. Abdelhameed et al., “First results from the CRESST-III low-mass dark matter program,”Physical Review D, vol. 100, no. 10, p. 102 002, Nov. 2019.DOI: 10.1103/PhysRevD.100.102002

work page doi:10.1103/physrevd.100.102002 2019
[17]

Testing spin-dependent dark matter interactions with lithium aluminate targets in CRESST- III,

G. Angloher et al., “Testing spin-dependent dark matter interactions with lithium aluminate targets in CRESST- III,”Physical Review D, vol. 106, no. 9, p. 092 008, Nov. 2022.DOI: 10.1103/PhysRevD.106.092008

work page doi:10.1103/physrevd.106.092008 2022
[18]

Demonstration of the HeRALD superfluid helium detector concept,

R. Anthony-Petersen et al., “Demonstration of the HeRALD superfluid helium detector concept,”Physical Review D, vol. 110, no. 7, p. 072 006, Oct. 2024.DOI: 10.1103/PhysRevD.110.072006

work page doi:10.1103/physrevd.110.072006 2024
[19]

Electronic and nuclear contributions in sub-GeV dark matter scattering: A case study with hydrogen,

J.-W. Chen, H.-C. Chi, C.-P. Liu, C.-L. Wu, and C.-P. Wu, “Electronic and nuclear contributions in sub-GeV dark matter scattering: A case study with hydrogen,” Physical Review D, vol. 92, no. 9, p. 096 013, Nov. 2015.DOI: 10.1103/PhysRevD.92.096013

work page doi:10.1103/physrevd.92.096013 2015
[20]

First observation of single photons in a cresst detector and new dark matter exclusion limits,

G. Angloher et al., “First observation of single photons in a cresst detector and new dark matter exclusion limits,”Physical Review D, vol. 110, no. 8, p. 083 038, 2024

work page 2024
[21]

Doubletes detectors to investigate the cresst low energy background: Results from above- ground prototypes,

G. Angloher et al., “Doubletes detectors to investigate the cresst low energy background: Results from above- ground prototypes,”The European Physical Journal C, vol. 84, no. 10, p. 1001, 2024. JOURNAL OF LATEX CLASS FILES, VOL. 18, NO. 9, SEPTEMBER 2020 5

work page 2024
[22]

Detector development for the cresst experiment,

G. Angloher et al., “Detector development for the cresst experiment,”Journal of Low Temperature Physics, vol. 216, no. 1, pp. 393–401, 2024

work page 2024
[23]

Characterisation of low background CaWO$ 4$ crystals for CRESST-III,

A. Kinast et al., “Characterisation of low background CaWO$ 4$ crystals for CRESST-III,”SciPost Physics Proceedings, no. 12, p. 031, Jul. 2023.DOI: 10.21468/ SciPostPhysProc.12.031

work page 2023