More Like this

1. A \(\beta \)-decay Study of the Low-spin Structure of \(^{98}\)Zr

   https://doi.org/10.5506/APhysPolBSupp.18.2-A21  

   Mashtakov, KR; Garrett, PE; Olaizola, B; Andreoiu, C; Ball, GC; Bender, P; Bildstein, V; Chester, A; Cross, DS; Dawkins, H; et al (February 2025, Acta Physica Polonica B Proceedings Supplement)

   A high-statistics \(\beta \)-decay experiment was conducted at the TRIUMF-ISAC facility using the \(8\pi \) \(\gamma \)-ray spectrometer and its ancillary detectors to study the low-spin structure of \(^{98}\)Zr. The analysis of \(\gamma \)–\(\gamma \) and \(e^-\)–\(\gamma \) coincidence data is presented. New measurements of \(\gamma \)-ray branching ratios and mixing ratios are reported for four \(J^{\pi } = 2^+\) states located above 2 MeV excitation energy in \(^{98}\)Zr. Based on these measurements, ratios of \(B\)(E2) values for transitions to lower-lying levels are determined, highlighting the preferential decay paths of these \(2^+\) states. AbstractPublished by the Jagiellonian University2025authors 

   more » « less
2. Do \({\mit \Lambda }_{\mathrm {CC}}\) and \(G\) Run?

   https://doi.org/10.5506/APhysPolB.55.12-A1  

   Donoghue, JF (December 2024, Acta Physica Polonica B)

   No AbstractPublished by the Jagiellonian University2024authors 

   more » « less
3. Probing Low-energy States in \(^{110}\)Cd Using Coulomb Excitation

   https://doi.org/10.5506/APhysPolBSupp.18.2-A26  

   Piętka, IZ; Wrzosek-Lipska, K; Garrett, PE; Zielińska, M; Próchniak, L; Nannini, A; Rocchini, M; Abraham, T; Aguilera, P; Ahmed, ZT; et al (February 2025, Acta Physica Polonica B Proceedings Supplement)

   A campaign of Coulomb-excitation experiments to study the electromagnetic structure of \(^{110}\)Cd was performed using beams of \(^{14}\)N, \(^{32}\)S, and \(^{60}\)Ni. The use of various reaction partners enables disentangling the contributions of individual electromagnetic matrix elements involved in the excitation process, yielding, among others, a precise determination of the lifetime of the 2\(^+_2\) state in \(^{110}\)Cd. AbstractPublished by the Jagiellonian University2025authors 

   more » « less
4. Search for pair production of scalar and vector leptoquarks decaying to muons and bottom quarks in proton-proton collisions at $\sqrt{s}=13\mathrm{TeV}$

   https://doi.org/10.1103/PhysRevD.109.112003  

   Hayrapetyan, A; Tumasyan, A; Adam, W; Andrejkovic, J W; Bergauer, T; Chatterjee, S; Damanakis, K; Dragicevic, M; Hussain, P S; Jeitler, M; et al (June 2024, Physical Review D)

   A search for pair production of scalar and vector leptoquarks (LQs) each decaying to a muon and a bottom quark is performed using proton-proton collision data collected at $\sqrt{s}=13\mathrm{TeV}$ with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of $138{\mathrm{fb}}^{-1}$ . No excess above standard model expectation is observed. Scalar (vector) LQs with masses less than 1810 (2120) GeV are excluded at 95% confidence level, assuming a 100% branching fraction of the LQ decaying to a muon and a bottom quark. These limits represent the most stringent to date. © 2024 CERN, for the CMS Collaboration2024CERN 

   more » « less
5. Low-lying Baryon Resonances from Lattice QCD

   https://doi.org/10.5506/APhysPolB.57.2-A10  

   Morningstar, C (February 2026, Acta Physica Polonica B)

   Calculating the properties of baryon resonances from quantum chromodynamics requires evaluating the temporal correlations between hadronic operators using integrations over field configurations weighted by a phase associated with the action. By formulating quantum chromodynamics on a space-time lattice in imaginary time, such integrations can be carried out non-perturbatively using a Markov-chain Monte Carlo method with importance sampling. The energies of stationary states in the finite volume of the lattice can be extracted from the temporal correlations. A quantization condition involving the scattering \(K\)-matrix and a complicated “box matrix” also yields a finite-volume energy spectrum. By appropriately parametrizing the scattering \(K\)-matrix, the best-fit values of the \(K\)-matrix parameters are those that produce a finite-volume spectrum which most closely matches that obtained from the Monte Carlo computations. Results for the \({\mit \Delta }\) resonance are presented, and a study of scattering for energies near the \({\mit \Lambda }(1405)\) resonance is outlined, showing a two-pole structure. The prospects for applying this methodology to the Roper resonance are discussed. AbstractPublished by the Jagiellonian University2026authors 

   more » « less