PGP. Grutta

P. Grutta

*This is an algorithmically generated author record based on publicly available information.

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Previous Organizations / Institutes

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P. Grutta has a total of 1000 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    Search for long-lived particles decaying into muons in proton-proton collisions at $ \sqrt{s}=13.6 $ TeV using data scouting

    by A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, A. K. Guven, et al.

    A bstract: A search for long-lived particles decaying into muons is performed using proton-proton collisions at $$ \sqrt{s}=13.6 $$ s = 13.6 TeV, collected by the CMS experiment at the LHC in 2022 and 2023, corresponding to an integrated luminosity of 62.4 fb − 1 . The data were collected using dedicated dimuon triggers with low transverse momentum thresholds, recorded with a high-rate data scouting trigger stream. This data stream retains a reduced amount of information at the high-level trigger, to explore otherwise inaccessible phase space at low multimuon invariant mass and nonzero displacement from the primary interaction vertex. No significant excess of events above the standard model prediction is found. Upper limits on branching fractions at 95% confidence level are set for a wide range of mass and lifetime hypotheses in several beyond the standard model frameworks, where the Higgs boson decays into long-lived dark photons or into dark partons that produce showers containing long-lived particles, or where a long-lived scalar resonance is produced from the decay of a b hadron. The resulting constraints improve and extend existing ones in large regions of the parameter space.

  • Open Access

    Observation of Electroweak Production of Pairs of Z Bosons in Proton-Proton Collisions at 13 TeV

    by A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, A. K. Guven, et al.

    The first evidence of electroweak (EW) production of pairs of Z bosons in association with two jets (jj) in the final state Z Z jj → ℓ ℓ ν ν jj , where ℓ = e , μ , is reported by the CMS experiment. The analysis is based on a data sample of proton-proton ( p p ) collisions at s = 13 TeV , corresponding to an integrated luminosity of 138 fb − 1 . Events are selected by requiring exactly two leptons of same flavor and opposite charge, large missing transverse momentum, and two jets with a large rapidity separation and large invariant mass. The EW production cross section in a fiducial volume is σ EW ( p p → Z Z jj → ℓ ℓ ν ν jj ) = 0.3 7 − 0.12 + 0.14 ( stat ) − 0.06 + 0.06 ( syst ) fb , in agreement with the standard model prediction of 0.39 ± 0.06 fb . The observed (expected) significance of the signal is 3.1 (2.8) standard deviations. Limits on anomalous quartic gauge couplings are derived in terms of dimension-8 effective field theory operators. A combination with the previously reported result from the Z Z decay channel with four charged leptons yields an observed (expected) significance of 5.0 (4.5) standard deviations for the EW production of Z boson pairs.

  • Open Access

    Search for pair production of additional neutral scalars within the Inert Doublet Model in a final state with two electrons or two muons in proton-proton collisions at $\sqrt{s}=13$ TeV and 13.6 TeV

    by A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, P. S. Hussain, et al.

    A bstract: A first dedicated search for pair production of new scalars predicted by the Inert Doublet Model is performed using proton-proton collisions. Data were collected with the CMS detector at the CERN LHC at $$\sqrt{s}=13$$ TeV and 13.6 TeV, corresponding to integrated luminosities of 138 fb − 1 and 35 fb − 1 , respectively. Within this model, four additional scalar bosons (H, A, H + , and H − ) are predicted. Through an additional discrete symmetry, the lightest new scalar, H, is stable, rendering it a viable dark matter candidate. These candidates can originate from quark-antiquark annihilation producing an offshell Z boson that decays to a pair of the new scalars. The target final state consists of exactly two opposite-charge same-flavour leptons (electrons or muons), with missing transverse momentum due to the stable neutral scalars, and very little hadronic activity. A parameterised neural network is used to separate the signal from the standard model background. No significant excess of events is observed. Exclusion limits at 95% confidence level are set on the production cross section of the two new neutral scalars, H and A, expressed in terms of their masses, m H and m A , in the m H vs. m A − m H plane. The observed (expected) exclusion region reaches m H = 108 (106) GeV for m A − m H = 78 (76) GeV and at m H = 70 GeV, covers the range of m A − m H = 40–90 (35–90) GeV.

  • Open Access

    First measurements of vector boson scattering in W±W± and WZ production in all-leptonic final states at $ \sqrt{s}=13.6 $ TeV

    by A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, A. K. Guven, et al.

    A bstract: The production cross sections of W ± W ± and WZ boson pairs in association with two jets in proton-proton collisions are measured at $$ \sqrt{s}=13.6 $$ s = 13.6 TeV. The data sample corresponds to an integrated luminosity of 171 fb − 1 , collected with the CMS detector during 2022–2024. The measurements are performed in the leptonic decay modes: W ± Z → ℓ ± νℓ′ ± ℓ′ ∓ and W ± W ± → ℓ ± νℓ′ ± ν , where ℓ , ℓ′ = e or μ . The electroweak productions of W ± W ± and WZ bosons are each observed with a significance greater than five standard deviations from the background-only hypothesis. Differential fiducial cross sections as functions of several observables are also measured.

  • Open Access

    Analysis of the CP structure of the Yukawa coupling between the Higgs boson and tau leptons in proton-proton collisions at $ \sqrt{s}=13.6 $ TeV

    by A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, A. K. Guven, et al.

    A bstract: This paper presents a measurement of the charge-parity ( CP ) structure of the Yukawa coupling between the Higgs boson (H) and tau leptons, using proton-proton collision data at $$ \sqrt{s}=13.6 $$ s = 13.6 TeV recorded with the CMS detector at the LHC, corresponding to an integrated luminosity of 62.4 fb − 1 . Angular correlations between the decay products of tau leptons produced in H → ττ decays are exploited to constrain the effective CP mixing angle α H ττ , which parameterizes the admixture of scalar and pseudoscalar couplings. The mixing angle is measured to be $$ {\alpha}^{\mathrm{H}\tau \tau}={\left({36}_{-30}^{+33}\right)}^{{}^{\circ}} $$ α H ττ = 36 − 30 + 33 ° , compared with an expected value of (0 ± 19) ° under the standard model hypothesis. When combined with the previous CMS measurement using data collected at $$ \sqrt{s}=13 $$ s = 13 TeV, corresponding to an integrated luminosity of 138 fb − 1 , the mixing angle is determined to be (7 ± 16) ° , with an expected value of (0 ± 14) ° . This result represents the most precise measurement by CMS of the CP nature of the Higgs boson coupling to tau leptons, with an expected precision that is the best achieved by any experiment to date.


  • Open Access

    Search for single production of a vectorlike B ′ quark decaying to a top quark and a W boson in the single-lepton final state in proton-proton collisions at s = 13     TeV

    by K. Tauqeer, A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, et al.

    A search is presented for the production of a single narrow-width vectorlike B ′ quark that decays to a t quark and a W boson. This search targets a single-lepton final state, where a muon or electron originates either from the semileptonic decay of the t quark or from the leptonic decay of the W boson, with the other particle decaying hadronically. The (semi)leptonic portion of the event is reconstructed from an electron or muon, missing transverse momentum, and a small-radius jet identified as a b quark jet if the muon or electron originates from the t quark. The hadronic portion of the event is reconstructed as a single large-radius jet. The originating particle of the large-radius jet is identified using a neural-network-based tagger, and the dominant background contributions are modeled from data using a neural autoregressive flow network. The data were collected from 2016 to 2018 by the CMS experiment at the LHC in proton-proton collisions at s = 13 TeV , corresponding to an integrated luminosity of 138 fb − 1 . This search is the most sensitive to date to the production of single narrow-width B ′ quarks. It excludes electroweak-singlet B ′ quarks with Γ / m B ′ = 5 % for masses between 0.8 and 1.23 TeV. Limits are also placed on the production cross section of single B ′ quarks produced in association with t quarks, and on the coupling factor of the B ′ quark to electroweak bosons.

  • Open Access

    Measurement of dijet angular distributions and search for beyond the standard model physics in proton-proton collisions at s=13TeV

    by A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, P.S. Hussain, M. Jeitler, et al.

  • Open Access

    Measurement of the top quark pair production cross section in PbPb collisions at $ \sqrt{s_{\mathrm{NN}}}=5.36 $ TeV

    by A. Belyaev, A. Gevorgyan, A. Hayrapetyan, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, P. S. Hussain, M. Jeitler, et al.

    A bstract: The inclusive cross section for top quark pair ( $$ \mathrm{t}\overline{\mathrm{t}} $$ t t ¯ ) production in lead-lead (PbPb) collisions is reported for the first time at a center-of-mass energy per nucleon pair of 5.36 TeV. The analysis uses data corresponding to an integrated luminosity of 1.58 nb − 1 collected by the CMS experiment at the CERN LHC in 2023. The $$ \mathrm{t}\overline{\mathrm{t}} $$ t t ¯ production cross section, $$ {\sigma}_{\mathrm{t}\overline{\mathrm{t}}}={3.42}_{-0.51}^{+0.54}{\left(\mathrm{stat}\right)}_{-0.43}^{+0.50}\left(\mathrm{syst}\right) $$ σ t t ¯ = 3.42 − 0.51 + 0.54 stat − 0.43 + 0.50 syst μ b, is measured in dilepton final states using a fit to a multivariate discriminator that combines the decay electron and muon kinematic properties with the multiplicity of bottom quark jets. The result is consistent with perturbative quantum chromodynamics calculations at next-to-next-to-leading order (NNLO) accuracy employing several nuclear parton distribution functions. In addition, the Drell–Yan production cross section ( σ DY ) for dilepton masses above 10 GeV and the ratio of $$ \mathrm{t}\overline{\mathrm{t}} $$ t t ¯ to DY cross sections $$ \left({R}_{\mathrm{t}\overline{\mathrm{t}}/\mathrm{DY}}\right) $$ R t t ¯ / DY are found to be compatible with the NNLO predictions. The observables $$ {\sigma}_{\mathrm{t}\overline{\mathrm{t}}} $$ σ t t ¯ , σ DY , and $$ {R}_{\mathrm{t}\overline{\mathrm{t}}/\mathrm{DY}} $$ R t t ¯ / DY are measured separately for central and semicentral PbPb collisions to investigate for the first time the dependence of top quark production on the collision impact parameter.

  • Open Access

    Search for Higgs boson pair production in the $ \mathrm{b}\overline{\mathrm{b}}\mathrm{WW} $ decay channel with two leptons in the final state using proton-proton collision data at $ \sqrt{s}=13.6 $ TeV

    by A. Gevorgyan, A. Hayrapetyan, V. Makarenko, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, A. K. Guven, et al.

    A bstract: A search for Higgs boson pair production is presented, targeting final states where one Higgs boson decays to a bottom quark-antiquark pair and the other Higgs boson decays to two W bosons, both of which decay leptonically, to an electron or a muon, and a neutrino. For the first time, the search is conducted with proton-proton collision data from the LHC at $$ \sqrt{s}=13.6 $$ s = 13.6 TeV, recorded with the CMS detector in 2022 and 2023 and corresponding to an integrated luminosity of 62 fb − 1 . The results are consistent with the standard model predictions. An upper limit of 12 . 0 times the standard model prediction at 95% confidence level is set on the Higgs boson pair production cross section, with an expected limit of 18 . 5. The results are also used to constrain the strength of the trilinear self-coupling of the Higgs boson, as well as of the quartic coupling between two Higgs bosons and two vector bosons.

  • Open Access

    System-size dependence of charged-particle suppression in ultrarelativistic nucleus-nucleus collisions

    by A. Belyaev, A. Gevorgyan, A. Hayrapetyan, A. Tumasyan, W. Adam, L. Benato, T. Bergauer, M. Dragicevic, S. Gundacker, A.K. Guven, et al.