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A study in scarlet -- II. Spectroscopic properties of a sample of Intermediate Luminosity Red Transients

(2024)

Authors:

G Valerin, A Pastorello, E Mason, A Reguitti, S Benetti, Y-Z Cai, T-W Chen, D Eappachen, N Elias-Rosa, M Fraser, A Gangopadhyay, EY Hsiao, DA Howell, C Inserra, L Izzo, J Jencson, E Kankare, R Kotak, P Lundqvist, PA Mazzali, K Misra, G Pignata, SJ Prentice, DJ Sand, SJ Smartt, MD Stritzinger, L Tartaglia, S Valenti, JP Anderson, JE Andrews, RC Amaro, C Barbarino, S Brennan, F Bufano, E Callis, E Cappellaro, R Dastidar, M Della Valle, A Fiore, MD Fulton, L Galbany, M Gromadzki, T Heikkilä, D Hiramatsu, E Karamehmetoglu, H Kuncarayakti, G Leloudas, M Limongi, M Lundquist, C McCully, TE Müller-Bravo, M Nicholl, P Ochner, E Padilla Gonzalez, E Paraskeva, C Pellegrino, A Rau, DE Reichart, TM Reynolds, R Roy, I Salmaso, M Shahbandeh, M Singh, J Sollerman, M Turatto, L Tomasella, S Wyatt, DR Young
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A study in scarlet -- I. Photometric properties of a sample of Intermediate Luminosity Red Transients

(2024)

Authors:

G Valerin, A Pastorello, A Reguitti, S Benetti, Y-Z Cai, T-W Chen, D Eappachen, N Elias-Rosa, M Fraser, A Gangopadhyay, EY Hsiao, DA Howell, C Inserra, L Izzo, J Jencson, E Kankare, R Kotak, PA Mazzali, K Misra, G Pignata, SJ Prentice, DJ Sand, SJ Smartt, MD Stritzinger, L Tartaglia, S Valenti, JP Anderson, JE Andrews, RC Amaro, S Brennan, F Bufano, E Callis, E Cappellaro, R Dastidar, M Della Valle, A Fiore, MD Fulton, L Galbany, T Heikkilä, D Hiramatsu, E Karamehmetoglu, H Kuncarayakti, G Leloudas, M Lundquist, C McCully, TE Müller-Bravo, M Nicholl, P Ochner, E Padilla Gonzalez, E Paraskeva, C Pellegrino, DE Reichart, TM Reynolds, R Roy, I Salmaso, M Singh, M Turatto, L Tomasella, S Wyatt, DR Young
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Radio observations of the 2022 outburst of the transitional Z-Atoll source XTE J1701-462

(2024)

Authors:

KVS Gasealahwe, IM Monageng, RP Fender, PA Woudt, AK Hughes, SE Motta, J van den Eijnden, P Saikia, E Tremou
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Catalog-based pseudo-$C_\ell$s

(2024)

Authors:

Kevin Wolz, David Alonso, Andrina Nicola
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Search for flavour-changing neutral-current couplings between the top quark and the Higgs boson in multi-lepton final states in 13 TeV pp collisions with the ATLAS detector

The European Physical Journal C SpringerOpen 84:7 (2024) 757

Authors:

G Aad, E Aakvaag, B Abbott, K Abeling, NJ Abicht, SH Abidi, M Aboelela, A Aboulhorma, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, A Ackermann, C Adam Bourdarios, L Adamczyk, SV Addepalli, MJ Addison, J Adelman, A Adiguzel, T Adye, AA Affolder, Y Afik, MN Agaras, J Agarwala

Abstract:

A search is presented for flavour-changing neutral-current interactions involving the top quark, the Higgs boson and an up-type quark (q=u, c) with the ATLAS detector at the Large Hadron Collider. The analysis considers leptonic decays of the top quark along with Higgs boson decays into two W bosons, two Z bosons or a τ+τ- pair. It focuses on final states containing either two leptons (electrons or muons) of the same charge or three leptons. The considered processes are tt¯ and Ht production. For the tt¯ production, one top quark decays via t→Hq. The proton–proton collision data set analysed amounts to (140fb-1) at (s=13TeV). No significant excess beyond Standard Model expectations is observed and upper limits are set on the t→Hq branching ratios at 95 % confidence level, amounting to observed (expected) limits of B(t→Hu)<2.8(3.0)×10-4 and B(t→Hc)<3.3(3.8)×10-4. Combining this search with other searches for tHq flavour-changing neutral-current interactions previously conducted by ATLAS, considering H→bb¯ and H→γγ decays, as well as H→τ+τ- decays with one or two hadronically decaying τ-leptons, yields observed (expected) upper limits on the branching ratios of B(t→Hu)<2.6(1.8)×10-4 and B(t→Hc)<3.4(2.3)×10-4.
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