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Combination of inclusive top-quark pair production cross-section measurements using ATLAS and CMS data at $$ \sqrt{s} $$ = 7 and 8 TeV

The ATLAS collaboration ; Aad, G. ; Abbott, B. ; [et al.]

Springer Science and Business Media LLC ; 2023

In: Journal of High Energy Physics Vol. 2023, No. 7 ( 2023-07-27)

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In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 7 ( 2023-07-27)

Abstract: A combination of measurements of the inclusive top-quark pair production cross-section performed by ATLAS and CMS in proton–proton collisions at centre-of-mass energies of 7 and 8 TeV at the LHC is presented. The cross-sections are obtained using top-quark pair decays with an opposite-charge electron–muon pair in the final state and with data corresponding to an integrated luminosity of about 5 fb − 1 at $$ \sqrt{s} $$ s = 7 TeV and about 20 fb − 1 at $$ \sqrt{s} $$ s = 8 TeV for each experiment. The combined cross-sections are determined to be 178 . 5 ± 4 . 7 pb at $$ \sqrt{s} $$ s = 7 TeV and $$ {243.3}_{-5.9}^{+6.0} $$ 243.3 − 5.9 + 6.0 pb at $$ \sqrt{s} $$ s = 8 TeV with a correlation of 0.41, using a reference top-quark mass value of 172.5 GeV. The ratio of the combined cross-sections is determined to be R 8 / 7 = 1 . 363 ± 0 . 032. The combined measured cross-sections and their ratio agree well with theory calculations using several parton distribution function (PDF) sets. The values of the top-quark pole mass (with the strong coupling fixed at 0.118) and the strong coupling (with the top-quark pole mass fixed at 172.5 GeV) are extracted from the combined results by fitting a next-to-next-to-leading-order plus next-to-next-to-leading-log QCD prediction to the measurements. Using a version of the NNPDF3.1 PDF set containing no top-quark measurements, the results obtained are $$ {m}_t^{\textrm{pole}}={173.4}_{-2.0}^{+1.8} $$ m t pole = 173.4 − 2.0 + 1.8 GeV and $$ {\alpha}_{\textrm{s}}\left({m}_Z\right)={0.1170}_{-0.0018}^{+0.0021} $$ α s m Z = 0.1170 − 0.0018 + 0.0021 .

Type of Medium: Online Resource

ISSN: 1029-8479

URL: Article

DOI: 10.1007/JHEP07(2023)213

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2023

detail.hit.zdb_id: 2027350-2

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2

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Search for heavy resonances and quantum black holes in eμ, eτ, and μτ final states in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV

The CMS collaboration ; Tumasyan, A. ; Adam, W. ; [et al.]

Springer Science and Business Media LLC ; 2023

In: Journal of High Energy Physics Vol. 2023, No. 5 ( 2023-05-30)

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In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 5 ( 2023-05-30)

Abstract: A search is reported for heavy resonances and quantum black holes decaying into eμ, eτ, and μτ final states in proton-proton collision data recorded by the CMS experiment at the CERN LHC during 2016–2018 at $$ \sqrt{s} $$ s = 13 TeV, corresponding to an integrated luminosity of 138 fb − 1 . The eμ, eτ, and μτ invariant mass spectra are reconstructed, and no evidence is found for physics beyond the standard model. Upper limits are set at 95% confidence level on the product of the cross section and branching fraction for lepton flavor violating signals. Three benchmark signals are studied: resonant τ sneutrino production in R parity violating supersymmetric models, heavy Z′ gauge bosons with lepton flavor violating decays, and nonresonant quantum black hole production in models with extra spatial dimensions. Resonant τ sneutrinos are excluded for masses up to 4.2TeV in the eμ channel, 3.7TeV in the eτ channel, and 3.6TeV in the μτ channel. A Z′ boson with lepton flavor violating couplings is excluded up to a mass of 5.0TeV in the eμ channel, up to 4.3Te V in the eτ channel, and up to 4.1TeV in the μτ channel. Quantum black holes in the benchmark model are excluded up to the threshold mass of 5.6TeV in the eμ channel, 5.2TeV in the eτ channel, and 5.0TeV in the μτ channel. In addition, model-independent limits are extracted to allow comparisons with other models for the same final states and similar event selection requirements. The results of these searches provide the most stringent limits available from collider experiments for heavy particles that undergo lepton flavor violating decays.

Type of Medium: Online Resource

ISSN: 1029-8479

URL: Article

DOI: 10.1007/JHEP05(2023)227

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2023

detail.hit.zdb_id: 2027350-2

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3

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Search for resonant production of strongly coupled dark matter in proton-proton collisions at 13 TeV

The CMS collaboration ; Tumasyan, A. ; Adam, W. ; [et al.]

Springer Science and Business Media LLC ; 2022

In: Journal of High Energy Physics Vol. 2022, No. 6 ( 2022-06-29)

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In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2022, No. 6 ( 2022-06-29)

Abstract: The first collider search for dark matter arising from a strongly coupled hidden sector is presented and uses a data sample corresponding to 138 fb −1 , collected with the CMS detector at the CERN LHC, at $$ \sqrt{s} $$ s = 13 TeV. The hidden sector is hypothesized to couple to the standard model (SM) via a heavy leptophobic Z′ mediator produced as a resonance in proton-proton collisions. The mediator decay results in two “semivisible” jets, containing both visible matter and invisible dark matter. The final state therefore includes moderate missing energy aligned with one of the jets, a signature ignored by most dark matter searches. No structure in the dijet transverse mass spectra compatible with the signal is observed. Assuming the Z′ boson has a universal coupling of 0.25 to the SM quarks, an inclusive search, relevant to any model that exhibits this kinematic behavior, excludes mediator masses of 1.5–4.0 TeV at 95% confidence level, depending on the other signal model parameters. To enhance the sensitivity of the search for this particular class of hidden sector models, a boosted decision tree (BDT) is trained using jet substructure variables to distinguish between semivisible jets and SM jets from background processes. When the BDT is employed to identify each jet in the dijet system as semivisible, the mediator mass exclusion increases to 5.1 TeV, for wider ranges of the other signal model parameters. These limits exclude a wide range of strongly coupled hidden sector models for the first time.

Type of Medium: Online Resource

ISSN: 1029-8479

URL: Article

DOI: 10.1007/JHEP06(2022)156

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2022

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4

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Observation of electroweak W+W− pair production in association with two jets in proton-proton collisions at s = 13 TeV

Tumasyan, A. ; Adam, W. ; Andrejkovic, J.W. ; [et al.]

Elsevier BV ; 2023

In: Physics Letters B Vol. 841 ( 2023-06), p. 137495-

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In: Physics Letters B, Elsevier BV, Vol. 841 ( 2023-06), p. 137495-

Type of Medium: Online Resource

ISSN: 0370-2693

URL: Article

DOI: 10.1016/j.physletb.2022.137495

RVK:

UA 1000

Language: English

Publisher: Elsevier BV

Publication Date: 2023

detail.hit.zdb_id: 1466612-1

detail.hit.zdb_id: 208866-6

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5

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Observation of B$$^0$$ $$\rightarrow $$ $$\uppsi $$(2S)K$$^0_\mathrm {S}\uppi ^+\uppi ^-$$ and B$$^0_\mathrm {s}$$ $$\rightarrow $$ $$\uppsi $$(2S)K$$^0_\mathrm {S}$$ decays

Tumasyan, A. ; Adam, W. ; Andrejkovic, J. W. ; [et al.]

Springer Science and Business Media LLC ; 2022

In: The European Physical Journal C Vol. 82, No. 5 ( 2022-05)

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In: The European Physical Journal C, Springer Science and Business Media LLC, Vol. 82, No. 5 ( 2022-05)

Abstract: Using a data sample of $$\sqrt{s}=13\,\text {TeV}$$ s = 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of $$103\text {~fb}^{-1}$$ 103 fb - 1 , the $$\text {B}^{0}_{\mathrm{s}} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0}$$ B s 0 → ψ ( 2S ) K S 0 and $$\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0} \uppi ^+\uppi ^-$$ B 0 → ψ ( 2S ) K S 0 π + π - decays are observed with significances exceeding 5 standard deviations. The resulting branching fraction ratios, measured for the first time, correspond to $${\mathcal {B}}(\text {B}^{0}_{\mathrm{s}} \rightarrow \uppsi (\text {2S})K_\mathrm{S}^{0})/{\mathcal {B}}(\text {B}^{0}\rightarrow \uppsi (\text {2S})K_\mathrm{S}^{0}) = (3.33 \pm 0.69 (\text {stat})\, \pm 0.11\,(\text {syst}) \pm 0.34\,(f_{\mathrm{s}}/f_{\mathrm{d}})) \times 10^{-2}$$ B ( B s 0 → ψ ( 2S ) K S 0 ) / B ( B 0 → ψ ( 2S ) K S 0 ) = ( 3.33 ± 0.69 ( stat ) ± 0.11 ( syst ) ± 0.34 ( f s / f d ) ) × 10 - 2 and $${\mathcal {B}}(\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}_\mathrm{S}^{0} \uppi ^{+} \uppi ^{-})/ {\mathcal {B}}(\text {B}^{0} \rightarrow \uppsi (\text {2S})\text {K}^{0}_{\mathrm{S}}) = 0.480 \pm 0.013\,(\text {stat}) \pm 0.032\,(\text {syst})$$ B ( B 0 → ψ ( 2S ) K S 0 π + π - ) / B ( B 0 → ψ ( 2S ) K S 0 ) = 0.480 ± 0.013 ( stat ) ± 0.032 ( syst ) , where the last uncertainty in the first ratio is related to the uncertainty in the ratio of production cross sections of $$\hbox {B}^{0}_{\mathrm{s}}$$ B s 0 and $$\hbox {B}^{0}$$ B 0 mesons, $$f_{\mathrm{s}}/f_{\mathrm{d}}$$ f s / f d .

Type of Medium: Online Resource

ISSN: 1434-6052

URL: Article

DOI: 10.1140/epjc/s10052-022-10315-y

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2022

detail.hit.zdb_id: 1397769-6

detail.hit.zdb_id: 1459069-4

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6

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Search for a massive scalar resonance decaying to a light scalar and a Higgs boson in the four b quarks final state with boosted topology

Tumasyan, A. ; Adam, W. ; Andrejkovic, J.W. ; [et al.]

Elsevier BV ; 2023

In: Physics Letters B Vol. 842 ( 2023-07), p. 137392-

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In: Physics Letters B, Elsevier BV, Vol. 842 ( 2023-07), p. 137392-

Type of Medium: Online Resource

ISSN: 0370-2693

URL: Article

DOI: 10.1016/j.physletb.2022.137392

RVK:

UA 1000

Language: English

Publisher: Elsevier BV

Publication Date: 2023

detail.hit.zdb_id: 1466612-1

detail.hit.zdb_id: 208866-6

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7

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Search for new particles in an extended Higgs sector with four b quarks in the final state at s = 13 TeV

Tumasyan, A. ; Adam, W. ; Andrejkovic, J.W. ; [et al.]

Elsevier BV ; 2022

In: Physics Letters B Vol. 835 ( 2022-12), p. 137566-

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In: Physics Letters B, Elsevier BV, Vol. 835 ( 2022-12), p. 137566-

Type of Medium: Online Resource

ISSN: 0370-2693

URL: Article

DOI: 10.1016/j.physletb.2022.137566

RVK:

UA 1000

Language: English

Publisher: Elsevier BV

Publication Date: 2022

detail.hit.zdb_id: 1466612-1

detail.hit.zdb_id: 208866-6

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8

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Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV

The CMS collaboration ; Tumasyan, A. ; Adam, W. ; [et al.]

Springer Science and Business Media LLC ; 2023

In: Journal of High Energy Physics Vol. 2023, No. 5 ( 2023-05-30)

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In: Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 5 ( 2023-05-30)

Abstract: Results are presented from a search for the Higgs boson decay H → Zγ, where Z → ℓ + ℓ − with ℓ = e or μ. The search is performed using a sample of proton-proton (pp) collision data at a center-of-mass energy of 13 TeV, recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 138 fb − 1 . Events are assigned to mutually exclusive categories, which exploit differences in both event topology and kinematics of distinct Higgs production mechanisms to enhance signal sensitivity. The signal strength μ , defined as the product of the cross section and the branching fraction $$ \left[\sigma \left(\textrm{pp}\to \textrm{H}\right)\mathcal{B}\left(\textrm{H}\to \textrm{Z}\upgamma \right)\right] $$ σ pp → H B H → Zγ relative to the standard model prediction, is extracted from a simultaneous fit to the ℓ + ℓ − γ invariant mass distributions in all categories and is measured to be μ = 2 . 4 ± 0 . 9 for a Higgs boson mass of 125.38 GeV. The statistical significance of the observed excess of events is 2.7 standard deviations. This measurement corresponds to $$ \left[\sigma \left(\textrm{pp}\to \textrm{H}\right)\mathcal{B}\left(\textrm{H}\to \textrm{Z}\upgamma \right)\right]=0.21\pm 0.08 $$ σ pp → H B H → Zγ = 0.21 ± 0.08 pb. The observed (expected) upper limit at 95% confidence level on μ is 4.1 (1.8), where the expected limit is calculated under the background-only hypothesis. The ratio of branching fractions $$ \mathcal{B}\left(\textrm{H}\to \textrm{Z}\upgamma \right)/\mathcal{B}\left(\textrm{H}\to \upgamma \upgamma \right) $$ B H → Zγ / B H → γγ is measured to be $$ {1.5}_{-0.6}^{+0.7} $$ 1.5 − 0.6 + 0.7 , which agrees with the standard model prediction of 0 . 69 ± 0 . 04 at the 1.5 standard deviation level.

Type of Medium: Online Resource

ISSN: 1029-8479

URL: Article

DOI: 10.1007/JHEP05(2023)233

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2023

detail.hit.zdb_id: 2027350-2

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9

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Inclusive nonresonant multilepton probes of new phenomena at s = 13 TeV

Tumasyan, A. ; Adam, W. ; Andrejkovic, J. W. ; [et al.]

American Physical Society (APS) ; 2022

In: Physical Review D Vol. 105, No. 11 ( 2022-6-14)

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In: Physical Review D, American Physical Society (APS), Vol. 105, No. 11 ( 2022-6-14)

Type of Medium: Online Resource

ISSN: 2470-0010 , 2470-0029

URL: Article

DOI: 10.1103/PhysRevD.105.112007

Language: English

Publisher: American Physical Society (APS)

Publication Date: 2022

detail.hit.zdb_id: 2844732-3

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10

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Measurement of the Higgs boson width and evidence of its off-shell contributions to ZZ production

The CMS Collaboration ; Tumasyan, A. ; Adam, W. ; [et al.]

Springer Science and Business Media LLC ; 2022

In: Nature Physics Vol. 18, No. 11 ( 2022-11), p. 1329-1334

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In: Nature Physics, Springer Science and Business Media LLC, Vol. 18, No. 11 ( 2022-11), p. 1329-1334

Abstract: Since the discovery of the Higgs boson in 2012, detailed studies of its properties have been ongoing. Besides its mass, its width—related to its lifetime—is an important parameter. One way to determine this quantity is to measure its off-shell production, where the Higgs boson mass is far away from its nominal value, and relating it to its on-shell production, where the mass is close to the nominal value. Here we report evidence for such off-shell contributions to the production cross-section of two Z bosons with data from the CMS experiment at the CERN Large Hadron Collider. We constrain the total rate of the off-shell Higgs boson contribution beyond the Z boson pair production threshold, relative to its standard model expectation, to the interval [0.0061, 2.0] at the 95% confidence level. The scenario with no off-shell contribution is excluded at a p -value of 0.0003 (3.6 standard deviations). We measure the width of the Higgs boson as $${{{\varGamma }}}_{{{{{{\rm{H}}}}}}}={3.2}_{-1.7}^{+2.4}\,{{{{{\rm{MeV}}}}}}$$ Γ H = 3.2 − 1.7 + 2.4 MeV , in agreement with the standard model expectation of 4.1 MeV. In addition, we set constraints on anomalous Higgs boson couplings to W and Z boson pairs.

Type of Medium: Online Resource

ISSN: 1745-2473 , 1745-2481

URL: Article

DOI: 10.1038/s41567-022-01682-0

Language: English

Publisher: Springer Science and Business Media LLC

Publication Date: 2022

detail.hit.zdb_id: 2206346-8

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