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Recent spectroscopy highlights from COMPASS / Pekeler, Henri Clemens (Bonn U., HISKP) /COMPASS Collaboration
The COMPASS experiment took data at the M2 beam line at CERN with a rich hadron physics program for the last two decades. This talk focuses on the spectroscopy program, where a 190 GeV negatively charged hadron beam was shot on a fixed proton target.We investigate diffractive dissociation events in various final states using both the $\pi^-$ and $K^-$ component of the beam. [...]
2024 - 10 p. - Published in : PoS HQL2023 (2024) 10 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.041

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Measurement of the $CP$ properties of Higgs boson interactions with $\tau$ leptons at the LHC / Nayak, Aruna Kumar (Bhubaneswar, Inst. Phys.) /ATLAS Collaboration ; CMS Collaboration
The ATLAS and CMS experiments have performed measurements of the $CP$ structure of the interaction between the Higgs boson and $\tau$ leptons using proton-proton collisions at $\sqrt{s}~=~13~{\rm TeV}$, delivered by LHC during 2016-2018. The measurements are based on the angular correlation between the decay planes of $\tau$ leptons produced in Higgs boson decays. [...]
2024 - 10 p. - Published in : PoS HQL2023 (2024) 10 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.062

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Heavy Neutrino Searches at LHC / Vizan Garcia, Jesus (Cantabria U., Santander) /ATLAS Collaboration ; CMS Collaboration
A wide variety of searches for Heavy neutral leptons (HNLs) is carried out at the Large Hadron Collider, featuring a variety of signatures and theoretical models. In this note, several recent searches carried out by the CMS and ATLAS experiments for a HNL mass range from 1 GeV to several TeVs are reviewed..
2024 - 8 p. - Published in : PoS HQL2023 (2024) 8 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.021

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Precision Measurements and Prospects with Kaons at CERN / Hives, Zdenko (Charles U.) /NA62 Collaboration
The NA62 experiment at the CERN SPS collected the world’s largest dataset of charged kaon decays during 2016-2018.The dataset was used for the most precise measurement of the branching fraction of the ultra-rare decay $K^+ \rightarrow \pi^+\nu\bar{\nu}$.In this proceedings, the NA62 experiment reports recent results from analyses of decays $K^+ \rightarrow \pi^0e^+\nu\gamma$ $(K_{e3\gamma})$, $K^+ \rightarrow \pi^+\mu^+\mu^-$ $(K_{\pi\mu\mu})$ and $K^+ \rightarrow \pi^+\gamma\gamma$ $(K_{\pi\gamma\gamma})$.The radiative $K_{e3\gamma}$ decay has a data sample of $\mathcal{O}(100k)$ candidates with sub-percent background contamination.Published results with the most precise measurement of the branching fraction and T-asymmetry are presented.The $K_{\pi\mu\mu}$ sample comprises about 27k signal events with negligible background contamination, and the results include the most precise determination of the branching ratio and the form factor.The $K_{\pi\gamma\gamma}$ sample contains about 4k signal events with \qty{10}{\percent} background contamination, and the analysis improves the precision of the branching ratio measurement by a factor of 3 with respect to the previous measurements.Recent results from the NA48/2 experiment from the analysis of the decay $K^{\pm} \rightarrow \pi^0\pi^0\mu^{\pm}\nu$ $(K_{\mu4}^{00})$ are also reported in this proceedings.The sample consists of 2437 events with \qty{15}{\percent} background contamination.The result is compared with a newly calculated theoretical prediction to 1-loop level, including previously neglected $R_1$ form factor.The NA62 experiment is approved to take data until the CERN Long Shutdown 3.A proposal for next-generation kaon experiments at CERN, called HIKE, was submitted to the SPSC in November 2023 and is also presented in this proceedings.In its first phase, HIKE will continue to study decays of charged kaons at significantly higher beam intensities than NA62 using a new detector system.Neutral kaon decays will be then studied in the second phase of HIKE..
2024 - 10 p. - Published in : PoS HQL2023 (2024) 10 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.003

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Study of charged current decays at LHCb / Mathad, Abhijit (CERN) /LHCb Collaboration
Semileptonic charged current decays, particularly $b \rightarrow c \ell^- \bar{\nu}_{\ell}$ and $b \rightarrow u \ell^- \bar{\nu}_{\ell}$ processes, have played a pivotal role in testing the foundations of the Standard Model of particle physics. This report presents recent findings from the LHCb experiment, where these decays have been explored to investigate three critical fronts: lepton flavor universality, the pursuit of new physics phenomena beyond the Standard Model, and the precision constraints imposed on the Cabibbo-Kobayashi-Maskawa matrix elements $|V_{cb}|$ and $|V_{ub}|$..
2024 - 10 p. - Published in : PoS HQL2023 (2024) 10 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.10

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Studying the internal structure of exotic hadrons and bound states using spectroscopy and complementary techniques with ALICE / Padhan, Sonali (Indian Inst. Tech., Mumbai) /ALICE Collaboration
The internal structure of hadrons, bound states, and the existence of $\mbox{ excited}$ states can be studied using hadron spectroscopy. Complementary information can be obtained using the multi-particle correlation technique, from which it is $\mbox{possible}$ to infer the existence and properties of bound states, and by $\mbox{measuring}$ the hadron yields and comparing them with predictions of the statistical $\mbox{hadronization}$ model. [...]
2024 - 7 p. - Published in : PoS HQL2023 (2024) 7 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.7

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Flavour prospects at the FCC-ee / Wiederhold, Aidan Richard (Warwick U.) /FCC PED Flavour Group Collaboration
In recent years the attention of the particle physics community with respect to future experiments has become increasingly focused on the prospects of a circular electron-positron collider based at CERN, the FCC-ee. Much progress has recently been made to evaluate the potential of flavour physics measurements at this facility. [...]
2024 - 8 p. - Published in : PoS HQL2023 (2024) 8 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.057

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Determination of $\gamma$ including BESIII inputs / Resmi, P K (Oxford U.) /LHCb Collaboration
A precise measurement of Cabibbo-Kobayashi-Maskawa unitarity triangle angle $\gamma$ is crucial for testing the Standard Model description of $CP$ violation and probing for new physics effects. The precision can be improved by exploring new $B$ and $D$ decay modes. [...]
2024 - 10 p. - Published in : PoS HQL2023 (2024) 10 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.063

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Goals and performance of LHCb Upgrade II / Jashal, Brij Kishor (Valencia U., IFIC ; Tata Inst.) /LHCb Collaboration
The proposed major upgrade of the LHCb detector for LHC Runs 5 and 6 aims to enhance the precision of flavor-physics observables significantly. Known as Upgrade II, this initiative is scheduled for implementation during the long shutdown 4 of the LHC. [...]
2024 - 10 p. - Published in : PoS HQL2023 (2024) 10 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.054

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10.

Measurements and prospects for $K_S^0$ decays at LHCb / Garcia Martin, Luis Miguel (Ecole Polytechnique, Lausanne) /LHCb Collaboration
Rare decays are fundamental probes for physics beyond the Standard Model, and the expanding LHCb programme on strange physics provides unique and complementary information with respect to the beauty and charm sectors. Recent results of rare kaon decays at LHCb are summarized as well as prospects for strange physics with the LHCb Upgrade..
2024 - 5 p. - Published in : PoS HQL2023 (2024) 005 Fulltext: PDF;
In : 16th International Conference on Heavy Quarks and leptons, Mumbai, India, 28 Nov - 2 Dec 2023, pp.005

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