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Jan Steggemann

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Publications associées (207)

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

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

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

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

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

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

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

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

"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

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

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

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

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

Anna Mascellani, Joanna Malgorzata Wanczyk, Jan Steggemann

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

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

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)

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

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

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

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

Study of Wh Production Through Vector Boson Scattering and Extraction of the Relative Sign of the W and Z Couplings to the Higgs Boson in Proton-proton Collisions at √s=13 Te

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

A search for the production of a W boson and a Higgs boson through vector boson scattering (VBS) is presented, using CMS data from proton-proton collisions at root s = 13 TeV collected from 2016 to 2018. The integrated luminosity of the data sample is 138 ...

ELSEVIER2025

Measurement of the T(t)over-barh and Th Production Rates in the H →b(b)over-bar Decay Channel Using Proton-proton Collision Data at √s=13 Tev

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

An analysis of the production of a Higgs boson (H) in association with a top quark-antiquark pair (t (t) over barH) or a single top quark (tH) is presented. The Higgs boson decay into a bottom quark-antiquark pair (H -> b (b) over bar) is targeted, and thr ...

SPRINGER2025

Measurement of the double-differential inclusive jet cross section in proton-proton collisions at s = 5.02 TeV

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

The inclusive jet cross section is measured as a function of jet transverse momentum pT and rapidity y. The measurement is performed using proton-proton collision data at s = 5.02 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrat ...

2025

Measurement of the inclusive WZ production cross section in pp collisions at s = 13.6 TeV

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

The inclusive WZ production cross section is measured in proton-proton collisions at a centre-of-mass energy of 13.6 TeV, using data collected during 2022 with the CMS detector, corresponding to an integrated luminosity of 34.7 fb−1. The measurement uses m ...

2025

Search for bosons of an extended Higgs sector in b quark final states in proton-proton collisions at s = 13 TeV

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

A search for beyond-the-standard-model neutral Higgs bosons decaying to a pair of bottom quarks, and produced in association with at least one additional bottom quark, is performed with the CMS detector. The data were recorded in proton-proton collisions a ...

2025

Higher-order moments of the elliptic flow distribution in PbPb collisions at √sNN=5.02 TeV

Rakesh Chawla, Andrea Rizzi, Matthias Finger, Federica Legger, Matteo Galli, Sun Hee Kim, Jian Zhao, João Miguel das Neves Duarte, Tagir Aushev, Hua Zhang, Alexis Kalogeropoulos, Yixing Chen, Tian Cheng, Ioannis Papadopoulos, Gabriele Grosso, Valérie Scheurer, Meng Xiao, Qian Wang, Michele Bianco, Varun Sharma, Joao Varela, Sourav Sen, Ashish Sharma, Seungkyu Ha, David Vannerom, Csaba Hajdu, Sanjeev Kumar, Sebastiana Gianì, Kun Shi, Abhisek Datta, Miao Hu, Siyuan Wang, Muhammad Waqas, Anton Petrov, Jian Wang, Yi Zhang, Muhammad Ansar Iqbal, Yong Yang, Xin Sun, Muhammad Ahmad, Donghyun Kim, Matthias Wolf, , , , , , , , , , , , , , , , , , , , , , , , , , ,

Search for supersymmetry in final states with disappearing tracks in proton-proton collisions at √s=13 TeV

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

A search is presented for charged, long-lived supersymmetric particles in final states with one or more disappearing tracks. The search is based on data from proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS detector at t ...

American Physical Society2024

Search for the Z Boson Decay to ττμμ in Proton-Proton Collisions at √s=13 TeV

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

The first search for the Z boson decay to tau tau mu mu at the CERN LHC is presented, based on data collected by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of ...

AMER PHYSICAL SOC2024

Combined search for electroweak production of winos, binos, higgsinos, and sleptons in proton-proton collisions at √s=13 TeV

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

A combination of the results of several searches for the electroweak production of the supersymmetric partners of standard model bosons, and of charged leptons, is presented. All searches use proton-proton collision data at root s = 13 TeV recorded with th ...

American Physical Society2024

Observation of double J/ψ meson production in pPb collisions at √sNN=8.16 TeV

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

The first observation of the concurrent production of two J/psi mesons in proton-nucleus collisions is presented. The analysis is based on a proton-lead (pPb) data sample recorded at a nucleon-nucleon center-of-mass energy of 8.16 TeV by the CMS experiment ...

American Physical Society2024

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The hydrodynamic flow-like behavior of charged hadrons in high-energy lead-lead collisions is studied through multiparticle correlations. The elliptic anisotropy values based on different orders of multiparticle cumulants, v(2){2k}, are measured up to the ...

Springer Nature2024