Jan Steggemann

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Search for New Resonances Decaying to Pairs of Merged Diphotons in Proton-Proton Collisions at (Formula presented)

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

A search is presented for an extended Higgs sector with two new particles, (Formula presented) and (Formula presented), in the process (Formula presented). Novel neural networks classify events with diphotons that are merged and determine the diphoton mass ...

2025

Measurement of Inclusive and Differential Cross Sections of Single Top Quark Production in Association with a W Boson in Proton-proton Collisions at √s=13.6 Tev

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

The first measurement of the inclusive and normalised differential cross sections of single top quark production in association with a W boson in proton-proton collisions at a centre-of-mass energy of 13.6 TeV is presented. The data were recorded with the ...

SPRINGER2025

Measurement of the inclusive tt¯ cross section in final states with at least one lepton and additional jets with 302 pb−1 of pp collisions at s = 5.02 TeV

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

A measurement of the top quark pair (tt¯) production cross section in proton-proton collisions at a centre-of-mass energy of 5.02 TeV is presented. The data were collected at the LHC in autumn 2017, in dedicated runs with low-energy and low-intensity condi ...

2025

Identification of low-momentum muons in the CMS detector using multivariate techniques in proton-proton collisions at √s = 13.6 TeV

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

"Soft"muons with a transverse momentum below 10 GeV are featured in many processes studied by the CMS experiment, such as decays of heavy-flavor hadrons or rare tau lepton decays. Maximizing the selection efficiency for these muons, while simultaneously su ...

2025

Search for long-lived heavy neutral leptons in proton-proton collision events with a lepton-jet pair associated with a secondary vertex at s = 13 TeV

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

A search for long-lived heavy neutral leptons (HNLs) using proton-proton collision data corresponding to an integrated luminosity of 138 fb−1 collected at s = 13 TeV with the CMS detector at the CERN LHC is presented. Events are selected with a charged lep ...

2025

Overview of High-density Qcd Studies with the Cms Experiment at the Lhc

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

We review key measurements performed by CMS in the context of its heavy ion physics program, using event samples collected in 2010-2018 with several collision systems and energies. These studies provide detailed macroscopic and microscopic probes of the qu ...

ELSEVIER2025

Search for the Higgs Boson Decays to a Ρ0, K, or K*0 Meson and a Photon in √proton-proton Collisions at √s=13 Tev

Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

Three rare decay processes of the Higgs boson to a rho(770)(0), phi(1020), or K-* (892)(0) meson and a photon are searched for using root s = 13 TeV proton-proton collision data collected by the CMS experiment at the LHC. Events are selected assuming the m ...

ELSEVIER2025

Measurement of the Higgs Boson Mass and Width Using the Four-lepton Final State in Proton-proton Collisions at √s=13 Tev

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

A measurement of the Higgs boson mass and width via its decay to two Z bosons is presented. Proton-proton collision data collected by the CMS experiment, corresponding to an integrated luminosity of 138 fb(-1) at a center-of-mass energy of 13 TeV, is used. ...

AMER PHYSICAL SOC2025

Test of lepton flavor universality in semileptonic (Formula presented) meson decays in proton-proton collisions at (Formula presented)

Konstantin Androsov, Jan Steggemann, Anna Mascellani, Joanna Malgorzata Wanczyk

A measurement of the ratio of branching fractions (Formula presented) in the (Formula presented), (Formula presented) decay channel is presented. This measurement uses a sample of proton-proton collision data collected at a center-of-mass energy of (Formul ...

2025

Observation of Collider Neutrinos without Final State Muons with the SND@LHC Experiment

Lesya Shchutska, Olivier Schneider, Aurelio Bay, Konstantin Androsov, Jan Steggemann, Elena Graverini, Ettore Zaffaroni, Mikhail Chapochnikov, Zhenyu Yang, Anna Mascellani

We report the observation of neutrino interactions without final state muons at the LHC, with a significance of 6.4σ. A dataset of proton-proton collisions at s=13.6 TeV collected by SND@LHC in 2022 and 2023 is used, corresponding to an integrated luminosi ...

American Physical Society (APS)2025

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