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Standard Model at the LHC 2022

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500/1-001 - Main Auditorium (CERN)

500/1-001 - Main Auditorium

CERN

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Alexander Yohei Huss (CERN), Tancredi Carli (CERN)
Description

The SM@LHC workshop deals with the latest developments as well as future prospects in Standard Model phenomenology at the LHC. The emphasis lies in bringing together experimentalists and theorists to stimulate discussions on the most interesting and topical aspects across the various fields. The main topics include Electroweak, Higgs, QCD, Top, Flavour Physics and EFT.

Given the present COVID-19 situation with most restrictions lifted, the meeting is planned in hybrid-mode (in person and on-line attendance).

Young Scientist Presentation award:

Mattermost:  mattermost.web.cern.ch/smlhc2022

Wi-Fi at CERN:  network connection

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Previous editions:  Online (SM@LHC 2021), Zurich (SM@LHC 2019), Berlin (SM@LHC 2018), Amsterdam (SM@LHC 2017), Pittsburgh (SM@LHC 2016), Florence (SM@LHC 2015), Madrid (SM@LHC 2014), Freiburg (SM@LHC 2013), Copenhagen (SM@LHC 2012), Durham (SM@LHC 2011) and London (SM@LHC 2009).

International Organizing Committee: Juan Alcaraz Maestre, Jeppe Andersen, Mario Campanelli, Tancredi Carli, Vitaliano Ciulli, Ayres Freitas, Stefan Höche, Eric Laenen, Katharina Müller, Aleandro Nisati
 

 

1Booking form SM LHCC 04.22.docx
smlhc2022_poster.pdf
Registration
ONLINE Registration form
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Participants
319 View full list
  • Monday 11 April
  • Tuesday 12 April
    • Higgs
      Conveners: Karsten Koeneke (Albert Ludwigs Universitaet Freiburg (DE)), Maria Cepeda (CIEMAT)
    • 13:45
      Coffee break
    • Top
      Conveners: Jose Enrique Palencia Cortezon (Universidad de Oviedo (ES)), Malgorzata Maria Worek (Rheinisch Westfaelische Tech. Hoch. (DE)), Maria Moreno Llacer (Univ. of Valencia and CSIC (ES))
    • 15:30
      Coffee break
    • Heavy Flavour
      Conveners: Alexis Pompili (Universita e INFN, Bari (IT)), Marzia Bordone (CERN)
    • 17:15
      break
    • YSF
      Conveners: Ayres Freitas, Juan Alcaraz Maestre (Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT, Madrid))
      • 26
        Mixed QCD-electroweak corrections to Higgs plus jet production at the LHC

        The detailed study of the Higgs boson is one of the main tasks of contemporary particle physics. Gluon fusion, the main production channel of Higgs bosons at the LHC, has been successfully modelled in QCD up to $\text{N}^3\text{LO}$. To fully exploit this unprecedent theoretical effort, sub-leading contributions, such as electroweak corrections, must be investigated. I will present the analytic calculations of the gluon- and quark-induced Higgs plus jet amplitudes in mixed QCD-electroweak corrections mediated by light quarks up to order $v \alpha^2 \alpha_S^{3/2}$.

        Speaker: Mr Marco Bonetti (RWTH University)
        main_4.pdf
        Recording
        Video preview
      • 27
        Search for non-resonant Higgs bosons pairs production in the bbtautau final state at CMS

        The most recent results on non-resonant Higgs bosons pairs production in the final state with two bottom quarks and two tau leptons will be presented. This final state has a sizeable branching fraction (7.3%) and the analysis benefit also from precise tau identification algorithms developed within the CMS collaboration. The analysis targets the gluon-gluon fusion and vector boson fusion production modes. 95% CL limits are set on SM production cross section, Higgs boson trilinear self-coupling and coupling of two Higgs bosons to two vector bosons. The sensitivity achieved by this search, performed with the full Run2 data set, is five times better than the one published using the LHC 2016 data set only. The improvement is determined by the larger statistics, the improved trigger strategy and by the use of Deep Neural Networks to perform objects selection and signal discrimination.

        Speaker: Jaime Leon Holgado (Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))
        CMS_HHbbtt_SMLHC22_JLH.pdf
        Recording
        Video preview
      • 28
        Observation of VBS production in opposite-sign WW events at CMS

        The observation of the electroweak production of a W+W− pair in association with two jets, with both W bosons decaying leptonically, is reported. The data sample corresponds to an integrated luminosity of 138fb−1 of proton-proton collisions at s = 13 TeV, collected by the CMS detector at the CERN LHC. A signal is observed (expected) with a significance of 5.6 (5.2) standard deviations with respect to the background-only hypothesis.

        Speaker: Bianca Sofia Pinolini
        Observation of VBS production in opposite-sign WW events @ CMS.pdf
        Recording
        Video preview
      • 29
        Flavour Tagging with Jet Substructure

        Jets are collimated bunches of hadrons ubiquitous in the detectors at the LHC. Studying the internal structure of these objects is essential to identify the original objects that originate the jet and to understand the underlying physical process. An important category of Jet Substructure (JSS) observables are Jet Angularities which have been recently calculated in resummed perturbation theory [1, 2] and measured in the Z+Jet and dijet processes at the LHC.

        In this talk I will discuss how Jet Angularities can be exploited to define an infrared and collinear safe jet flavour tagger considering a recently proposed [3] application in the context of the Z+Jet process. In particular, by tagging the final state jet as quark-initiated we have been able to enhance the initial-state gluon contribution. I discuss new resummed theoretical predictions for the transverse momentum distributions of events selected by the tagger which would be potentially interesting to probe the gluonic degrees of freedom of the colliding protons.

        Speaker: Simone Caletti
        Caletti_SMatLHC2022_YSF.pdf
        Recording
        Video preview
      • 30
        Differential cross-sections for $t\bar{t}j + X$ production at the LHC

        The fundamental SM parameter of the top quark mass can be measured with unprecedented accuracy at LHC due to the large production cross section for top quark pairs, and top quark pairs in association with at least one hard jet. The extraction of this quantity can be achieved using the $\rho_s$ distribution, an observable related to the invariant mass of the t-tbar + jet system. Thereby, the top-quark mass extraction can be performed using different mass renormalisation schemes. We present theory predictions useful for this extraction in the on-shell, the MSbar and, for the first time,the MSR scheme.
        In view of the high experimental accuracy, which is reached in measuring
        the relevant production cross sections at the LHC, the control over the associated
        theory uncertainties becomes increasingly important. To this end we present a study of the effect of varying theoretical input parameters in the calculation of t-tbar + jet + X NLO differential cross sections. We investigate the effect of static and dynamical renormalization and factorization scale definitions and different PDF sets as well as the influence of the $R$ parameter in the jet reconstruction procedure. We make public a set of reference fiducial cross-sections for different cuts, that we expect to be very useful for the forthcoming LHC experimental analyses at $\sqrt{s}$ = 13 TeV and higher center-of-mass energies.

        Speaker: Katharina Voss (University of Siegen (DE))
        Recording
        Video preview
        YSF_SMatLHC_ttj_KVoss.pdf
      • 31
        The Drell-Yan $q_T$ Spectrum and Its Uncertainty at N$^3$LL$'$

        We present state-of-the-art SCETlib predictions for the $W$ and $Z/\gamma^*$ transverse-momentum ($q_T$) distributions at the LHC at complete three-loop order in resummed perturbation theory (N$^3$LL$'$) and matched to available fixed order. We pay particular attention to the estimation of theory uncertainties via profile scale variations in such a way that perturbative uncertainties due to PDF evolution, perturbative resummation uncertainties, and nonperturbative uncertainties for $q_T \to 0$ are cleanly disentangled, and compare our predictions to high-precision measurements by the ATLAS and CMS experiments. The speed and versatility of our resummed calculation also allow us to study the dependence on the strong coupling, the PDFs, and their parametric uncertainties at this order. We find intriguing evidence that the normalized ATLAS and CMS $Z$ $q_T$ spectra may prefer a lower strong coupling than the PDG value.

        Speaker: Johannes Michel (MIT CTP)
        Michel_SM_at_LHC_2022-04-12.pdf
        Recording
        Video preview
      • 32
        A search for the dimuon decay of the Standard Model Higgs boson in pp collisions at 13 TeV with the ATLAS Detector

        A search for the dimuon decay of the Standard Model (SM) Higgs boson is performed using data corresponding to an integrated luminosity of 139/fb collected with the ATLAS detector in Run2 pp collisions at 13 TeV at the Large Hadron Collider. The observed (expected) significance over the background-only hypothesis for a Higgs boson with a mass of 125.09 GeV is 2.0σ (1.7σ). The observed upper limit on the cross section times branching ratio is 2.2 times the SM prediction at 95% confidence level, while the expected limit on a H → μμ signal assuming the absence (presence) of a SM signal is 1.1 (2.0). The best-fit value of the signal strength parameter, defined as the ratio of the observed signal yield to the one expected in the SM, is μ=1.2 ± 0.6.

        Speakers: Ye Chen (University of Science and Technology of China (CN)), Ye Chen (Hefei University of Science and Technology of China)
        SMLHC_Talk_2022.pdf
  • Wednesday 13 April
  • Thursday 14 April
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