Adelaide Research & Scholarship
Adelaide Research & Scholarship (AR&S) is the University of Adelaide’s digital repository. AR&S provides a platform for the collection, organisation, access and preservation of the research and scholarly outputs of the University community in digital formats, as well as digital management of information in physical formats.
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Recent Submissions
Search for Magnetic Monopole Pair Production in Ultraperipheral Pb+Pb Collisions at √𝑠NN=5.36 TeV with the ATLAS Detector at the LHC
(American Physical Society, 2025) Aad, G.; Aakvaag, E.; Abbott, B.; Abdelhameed, S.; Abeling, K.; Abicht, N.J.; Abidi, S.H.; Aboelela, M.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B.S.; Ackermann, A.; Adam Bourdarios, C.; Adamczyk, L.; Addepalli, S.V.; Addison, M.J.; Adelman, J.; Adiguzel, A.; et al.
This Letter presents a search for highly ionizing magnetic monopoles in 262 μb⁻¹ of ultraperipheral Pb + Pb collision data at √sNN = 5.36 TeV collected by the ATLAS detector at the LHC. A new methodology that exploits the properties of clusters of hits reconstructed in the innermost silicon detector layers is introduced to study highly ionizing particles in heavy-ion data. No significant excess above the background, which is estimated using a data-driven technique, is observed. Using a nonperturbative semiclassical model, upper limits at 95% confidence level are set on the cross section for pair production of monopoles with a single Dirac magnetic charge in the mass range of 20–150 GeV. Depending on the model, monopoles with a single Dirac magnetic charge and mass below 80–120 GeV are excluded.
Selective attention and working memory in young adults born very preterm
(Public Library of Science (PLoS), 2025) Mills, T.; Pascoe, L.; Spencer-Smith, M.; Nguyen, T.N.N.; Anderson, P.J.; Treviño Villegas, M.
Introduction: Research has consistently reported that individuals born very preterm (VP; < 32 weeks’ gestation) are at increased risk for reduced working memory (WM) performance compared with their term born peers. However, performance on working memory tasks are reliant on several cognitive skills, including selective attention, and the underlying mechanism for poorer working memory following VP birth remains unclear. The current study aimed to assess the impact of selective attention on working memory performance in young adults born VP compared with those born at term, using an experimental task (i.e., visuospatial change detection task). Method: Participants were 111 young adults born VP (mean age: 20.1 years) and 43 young adults born at term (mean age: 19.9 years). They completed an adapted visuospatial change detection task which assessed working memory maintenance with increasing levels of selective attention demands. Results: The VP group demonstrated slightly poorer performance in working memory compared with the term born group when selective attention demands were minimal. The working memory group difference did not increase with the introduction of greater selective attention demands. Conclusion Based on these findings, reductions in working memory performance in those born VP compared with term born controls are unlikely to be explained by selective attention challenges. This study has important clinical implications such that it provides important insights and evidence into the cognitive development of those born VP as they begin to reach adulthood. Further, this research study further the cognitive phenotype of this population, which, in turn, may aid in the development of efficacious cognitive interventions for this high-risk group
Search for 𝑃𝑐𝑐‾𝑠(4459)⁰ and 𝑃𝑐𝑐‾𝑠(4338)⁰ in ϒ(1𝑆,2𝑆) Inclusive Decays at Belle
(American Physical Society, 2025) Adachi, I.; Aggarwal, L.; Ahmed, H.; Ahn, J.K.; Aihara, H.; Akopov, N.; Alhakami, M.; Aloisio, A.; Althubiti, N.; Asner, D.M.; Atmacan, H.; Aushev, V.; Aversano, M.; Ayad, R.; Babu, V.; Bae, H.; Baghel, N.K.; Bahinipati, S.; Bambade, P.; Banerjee, S.; et al.
Using data samples of 102 million ϒ(1S) events and 158 million ϒ(2S) events collected by the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider, we search for [udsc¯c] pentaquark states decaying to J/ψΛ. Using the first observations of ϒ(1S; 2S) inclusive decays to J/ψΛ, we find evidence of the Pc¯cs(4459)⁰ state with a local significance of 3.3 standard deviations, including statistical and systematic uncertainties. We measure the mass and width of the Pc¯cs(4459)⁰ to be (4471.7 ± 4.8 ± 0.6) MeV/c² and (22 ± 13 ± 3) MeV, respectively. The branching fractions for Pc¯cs(4459)⁰ production are measured to be B[ϒ(1S)→Pcc¯s(4459)⁰/P¯cc¯s(4459)⁰ + anything] = (3.5 ± 2.0 ± 0.2) ×10⁻⁶ and B[ϒ(2S) → Pc¯cs(4459)⁰/ P¯c¯cs(4459)⁰ + anything] = (2.9 ± 1.7 ± 0.4) × 10⁻⁶. The inclusive branching fractions of ϒ(1S; 2S) → J/ψΛ/Λ¯ are measured to be B[ϒ(1S) → J/ψΛ/Λ¯ + anything] = (36.9 ± 5.3 ± 2.4) × 10⁻⁶ and B[ϒ(2S) → J/ψΛ/Λ¯ + anything] = (22.3 ± 5.7 ± 3.1) × 10⁻⁶. We measure the visible cross section σ(e⁺e⁻ → J/ψΛ/Λ¯ + anything) = (90 ± 14 ± 6) fb for the continuum production at √s = 10.52 GeV. In all cases, the first uncertainties are statistical and the second are systematic.
Splanchnic and Pelvic Spinal Afferent Pathways Relay Sensory Information From the Mouse Colorectum Into Distinct Brainstem Circuits
(Wiley, 2025) Wang, Q.; McGovern, A.E.; Kyloh, M.; Rychkov, G.; Spencer, N.J.; Mazzone, S.B.; Brierley, S.M.; Harrington, A.M.
The distal colon and rectum (colorectum) are innervated by two distinct spinal (splanchnic and pelvic) afferent nerve pathways. This study aimed to identify where the sensory information relayed by splanchnic and pelvic afferents integrates within the brainstem. Microinjection of transneuronal viral tracer (herpes simplex virus-1 H129 strain expressing EGFP, H129-EGFP) into the distal colon was used to assess the brainstem structures receiving ascending input from the colorectum. H129-EGFP+ cells were distributed in structures involved in ascending sensory relay, descending pain modulation, and autonomic regulation in the medulla from 96 h and in the pontine and caudal midbrain at 120 h after inoculation. In a separate cohort of mice, in vivo noxious colorectal distension (CRD) followed by brainstem immunolabeling for phosphorylated MAP kinase ERK 1/2 (pERK) determined neurons activated by CRD. Many of the structures containing H129-EGFP+ labeling also contained pERK-labeled neurons, indicating H129-EGFP+ labeling in colorectal signaling pathways. Surgical removal of dorsal root ganglia (DRG) containing the cell bodies of splanchnic colorectal afferent neurons significantly reduced CRD-evoked pERK neuronal activation within the caudal ventrolateral medulla, rostral ventromedial medulla, and the lateral parabrachial nuclei. Surgical removal of the DRG containing the cell bodies of pelvic colorectal afferent neurons significantly reduced CRD-evoked pERK neuronal activation within the rostral ventromedial medulla, lateral parabrachial nuclei, the locus coeruleus, Barrington's nucleus, and periaqueductal gray. Collectively, this study showed that the two spinal afferent pathways innervating the colorectum relay information into different brainstem structures and provide new insight into their unique roles in relaying information into the gut-brain axis controlling colorectal sensory-motor function.
State estimation with unknown measurement losses: A detector-based approach
(Elsevier, 2024) Lin, H.; Cai, C.; Lu, S.; Xie, X.; Shi, P.
In this paper, we are devoted to solving the problems of designing an estimator, and determining its estimator stability and estimation performance for a system with unknown measurement losses (UML). The solutions to these problems include three steps: first, we design two measurementloss detectors to detect the measurement losses; Then, we design a detector-based estimator for UML systems. Finally, by analyzing the upper and lower bounds of the covariances of the proposed estimator, we establish a stability condition and determine the estimation performance. Detailed findings and main contributions of this paper are summarized as follows: (i) from the estimator stability perspective, we obtain a necessary and sufficient stability condition. Specifically, the estimator is stable almost surely if and only if the measurement-loss rate is less than a critical value. (ii) From the estimation performance perspective, we prove that under some conditions, the performance of the proposed estimator is almost surely the same as that of the optimal estimator for the system with known measurement losses.