Abstract Azimuthal correlations between the two jets with the largest transverse momenta $$p_{\mathrm {T}}$$ pT in inclusive 2-, 3-, and 4-jet events are presented for several regions of the leading ...jet $$p_{\mathrm {T}}$$ pT up to 4$$\,\text {Te}\text {V}$$ Te . For 3- and 4-jet scenarios, measurements of the minimum azimuthal angles between any two of the three or four leading $$p_{\mathrm {T}}$$ pT jets are also presented. The analysis is based on data from proton–proton collisions collected by the CMS Collaboration at a centre-of-mass energy of 13$$\,\text {Te}\text {V}$$ Te , corresponding to an integrated luminosity of 35.9$$\,\text {fb}^{-1}$$ fb-1 . Calculations based on leading-order matrix elements supplemented with parton showering and hadronization do not fully describe the data, so next-to-leading-order calculations matched with parton shower and hadronization models are needed to better describe the measured distributions. Furthermore, we show that azimuthal jet correlations are sensitive to details of the parton showering, hadronization, and multiparton interactions. A next-to-leading-order calculation matched with parton showers in the MC@NLO method, as implemented in herwig 7, gives a better overall description of the measurements than the powheg method.
Abstract The nuclear modification factors of $${\mathrm {J}/\psi }$$ J/ψ and $$\psi \text {(2S)}$$ ψ(2S) mesons are measured in $$\text {PbPb}$$ PbPb collisions at a centre-of-mass energy per nucleon ...pair of $$\sqrt{\smash b{s_{_{\text {NN}}} = 5.02\,\text {Te}\text {V} $$ sNN=5.02TeV . The analysis is based on $$\text {PbPb}$$ PbPb and $$\mathrm {p}\mathrm {p}$$ pp data samples collected by CMS at the LHC in 2015, corresponding to integrated luminosities of 464$$\,\mu \mathrm {b}^{-1}$$ μb-1 and 28$$\,\text {pb}^\text {-1}$$ pb-1 , respectively. The measurements are performed in the dimuon rapidity range of $$|y | < 2.4$$ |y|<2.4 as a function of centrality, rapidity, and transverse momentum ($$p_{\mathrm {T}}$$ pT ) from $$p_{\mathrm {T}} =3$$ pT=3 $${\,\text {Ge}\text {V}/}\text {c}$$ GeV/c in the most forward region and up to 50$${\,\text {Ge}\text {V}/}\text {c}$$ GeV/c . Both prompt and nonprompt (coming from b hadron decays) $${\mathrm {J}/\psi }$$ J/ψ mesons are observed to be increasingly suppressed with centrality, with a magnitude similar to the one observed at $$\sqrt{\smash b{s_{_{\text {NN}}} = 2.76\,\text {Te}\text {V} $$ sNN=2.76TeV for the two $${\mathrm {J}/\psi }$$ J/ψ meson components. No dependence on rapidity is observed for either prompt or nonprompt $${\mathrm {J}/\psi }$$ J/ψ mesons. An indication of a lower prompt $${\mathrm {J}/\psi }$$ J/ψ meson suppression at $$p_{\mathrm {T}} > 25$$ pT>25 $${\,\text {Ge}\text {V}/}\text {c}$$ GeV/c is seen with respect to that observed at intermediate $$p_{\mathrm {T}}$$ pT . The prompt $$\psi \text {(2S)}$$ ψ(2S) meson yield is found to be more suppressed than that of the prompt $${\mathrm {J}/\psi }$$ J/ψ mesons in the entire $$p_{\mathrm {T}}$$ pT range.
Abstract Events with no charged particles produced between the two leading jets are studied in proton-proton collisions at $$\sqrt{s}=7$$ s=7 $$\,\text {TeV}$$ TeV . The jets were required to have ...transverse momentum $$p_{\mathrm {T}} ^{\text {jet}}>40$$ pTjet>40 $$\,\text {GeV}$$ GeV and pseudorapidity $$1.5<|\eta ^{\text {jet}} |<4.7$$ 1.5<|ηjet|<4.7 , and to have values of $$\eta ^{\text {jet}}$$ ηjet with opposite signs. The data used for this study were collected with the CMS detector during low-luminosity running at the LHC, and correspond to an integrated luminosity of 8$$\,\text {pb}^{-1}$$ pb-1 . Events with no charged particles with $$p_{\mathrm {T}} >0.2$$ pT>0.2 $$\,\text {GeV}$$ GeV in the interval $$-1<\eta < 1$$ -1<η<1 between the jets are observed in excess of calculations that assume no color-singlet exchange. The fraction of events with such a rapidity gap, amounting to 0.5–1% of the selected dijet sample, is measured as a function of the $$p_{\mathrm {T}}$$ pT of the second-leading jet and of the rapidity separation between the jets. The data are compared to previous measurements at the Tevatron, and to perturbative quantum chromodynamics calculations based on the Balitsky–Fadin–Kuraev–Lipatov evolution equations, including different models of the non-perturbative gap survival probability.
Abstract A search for standard model production of four top quarks ($$\mathrm {t}\overline{\mathrm {t}} \mathrm {t}\overline{\mathrm {t}} $$ tt¯tt¯ ) is reported using events containing at least ...three leptons ($$\mathrm {e}, \mathrm {\mu }$$ e,μ ) or a same-sign lepton pair. The events are produced in proton–proton collisions at a center-of-mass energy of 13$$\,\text {TeV}$$ TeV at the LHC, and the data sample, recorded in 2016, corresponds to an integrated luminosity of 35.9$$\,\text {fb}^{-1}$$ fb-1 . Jet multiplicity and flavor are used to enhance signal sensitivity, and dedicated control regions are used to constrain the dominant backgrounds. The observed and expected signal significances are, respectively, 1.6 and 1.0 standard deviations, and the $$\mathrm {t}\overline{\mathrm {t}} \mathrm {t}\overline{\mathrm {t}} $$ tt¯tt¯ cross section is measured to be $$16.9^{+13.8}_{-11.4}$$ 16.9-11.4+13.8 $$\,\text {fb}$$ fb , in agreement with next-to-leading-order standard model predictions. These results are also used to constrain the Yukawa coupling between the top quark and the Higgs boson to be less than 2.1 times its expected standard model value at 95% confidence level.
Abstract Four-lepton production in proton-proton collisions, $$\mathrm {p}\mathrm {p}\rightarrow (\mathrm{Z}/ \gamma ^*)(\mathrm{Z}/\gamma ^*) \rightarrow 4\ell $$ pp→(Z/γ∗)(Z/γ∗)→4ℓ , where $$\ell = ...\mathrm {e}$$ ℓ=e or $$\mu $$ μ , is studied at a center-of-mass energy of 13$$\,\text {TeV}$$ TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 35.9$$\,\text {fb}^{-1}$$ fb-1 . The ZZ production cross section, $$\sigma (\mathrm {p}\mathrm {p}\rightarrow \mathrm{Z}\mathrm{Z}) = 17.2 \pm 0.5\,\text {(stat)} \pm 0.7\,\text {(syst)} \pm 0.4\,\text {(theo)} \pm 0.4\,\text {(lumi)} \text { pb} $$ σ(pp→ZZ)=17.2±0.5(stat)±0.7(syst)±0.4(theo)±0.4(lumi) pb , measured using events with two opposite-sign, same-flavor lepton pairs produced in the mass region $$60< m_{\ell ^+\ell ^-} < 120\,\text {GeV} $$ 60<mℓ+ℓ-<120GeV , is consistent with standard model predictions. Differential cross sections are measured and are well described by the theoretical predictions. The Z boson branching fraction to four leptons is measured to be $$\mathcal {B}(\mathrm{Z}\rightarrow 4\ell ) = 4.83 _{-0.22}^{+0.23} (stat)_{-0.29}^{+0.32} (syst) \pm 0.08 (theo) \pm 0.12 (lumi) \times 10^{-6}$$ B(Z→4ℓ)=4.83-0.22+0.23(stat)-0.29+0.32(syst)±0.08(theo)±0.12(lumi)×10-6 for events with a four-lepton invariant mass in the range $$80< m_{4\ell } < 100\,\text {GeV} $$ 80<m4ℓ<100GeV and a dilepton mass $$m_{\ell \ell } > 4\,\text {GeV} $$ mℓℓ>4GeV for all opposite-sign, same-flavor lepton pairs. The results agree with standard model predictions. The invariant mass distribution of the four-lepton system is used to set limits on anomalous ZZZ and ZZ$$\gamma $$ γ couplings at 95% confidence level: $$-0.0012<f_4^\mathrm{Z}<0.0010$$ -0.0012<f4Z<0.0010 , $$-0.0010<f_5^\mathrm{Z}<0.0013$$ -0.0010<f5Z<0.0013 , $$-0.0012<f_4^{\gamma }<0.0013$$ -0.0012<f4γ<0.0013 , $$-0.0012<f_5^{\gamma }< 0.0013$$ -0.0012<f5γ<0.0013 .
Abstract A search for new phenomena is performed using events with jets and significant transverse momentum imbalance, as inferred through the $$M_{\mathrm {T2}}$$ MT2 variable. The results are based ...on a sample of proton–proton collisions collected in 2016 at a center-of-mass energy of 13$$\,\text {TeV}$$ TeV with the CMS detector and corresponding to an integrated luminosity of 35.9$$\,\text {fb}^\text {-1}$$ fb-1 . No excess event yield is observed above the predicted standard model background, and the results are interpreted as exclusion limits at 95% confidence level on the masses of predicted particles in a variety of simplified models of R-parity conserving supersymmetry. Depending on the details of the model, 95% confidence level lower limits on the gluino (light-flavor squark) masses are placed up to 2025 (1550)$$\,\text {GeV}$$ GeV . Mass limits as high as 1070 (1175)$$\,\text {GeV}$$ GeV are set on the masses of top (bottom) squarks. Information is provided to enable re-interpretation of these results, including model-independent limits on the number of non-standard model events for a set of simplified, inclusive search regions.
Abstract A data sample of events from proton–proton collisions with two isolated same-sign leptons, missing transverse momentum, and jets is studied in a search for signatures of new physics ...phenomena by the CMS Collaboration at the LHC. The data correspond to an integrated luminosity of 35.9 $$\,\text {fb}^{-\text {1}}$$ fb - 1 , and a center-of-mass energy of 13 $$\,\text {TeV}$$ TeV . The properties of the events are consistent with expectations from standard model processes, and no excess yield is observed. Exclusion limits at 95% confidence level are set on cross sections for the pair production of gluinos, squarks, and same-sign top quarks, as well as top-quark associated production of a heavy scalar or pseudoscalar boson decaying to top quarks, and on the standard model production of events with four top quarks. The observed lower mass limits are as high as 1500 $$\,\text {GeV}$$ GeV for gluinos, 830 $$\,\text {GeV}$$ GeV for bottom squarks. The excluded mass range for heavy (pseudo)scalar bosons is 350–360 (350–410) $$\,\text {GeV}$$ GeV . Additionally, model-independent limits in several topological regions are provided, allowing for further interpretations of the results.
Abstract The first measurement of the jet mass $$m_{\text {jet}}$$ m jet of top quark jets produced in $${\mathrm{t}}\overline{\mathrm{t}} $$ t t ¯ events from pp collisions at $$\sqrt{s}=8$$ s = 8 ...$$\,\text {TeV}$$ TeV is reported for the jet with the largest transverse momentum $$p_{\mathrm{T}}$$ p T in highly boosted hadronic top quark decays. The data sample, collected with the CMS detector, corresponds to an integrated luminosity of 19.7 $$\,\text {fb}^{-1}$$ fb - 1 . The measurement is performed in the lepton+jets channel in which the products of the semileptonic decay $${\mathrm{t}} \rightarrow \mathrm{b} \mathrm {W}$$ t → b W with $$\mathrm {W}\rightarrow \ell \nu $$ W → ℓ ν where $$\ell $$ ℓ is an electron or muon, are used to select $${\mathrm{t}}\overline{\mathrm{t}} $$ t t ¯ events with large Lorentz boosts. The products of the fully hadronic decay $${\mathrm{t}} \rightarrow \mathrm{b} \mathrm {W}$$ t → b W with $$\mathrm {W}\rightarrow \mathrm{q} \overline{\mathrm{q}} '$$ W → q q ¯ ′ are reconstructed using a single Cambridge–Aachen jet with distance parameter $$R=1.2$$ R = 1.2 , and $$p_{\mathrm{T}} >400$$ p T > 400 $$\,\text {GeV}$$ GeV . The $${\mathrm{t}}\overline{\mathrm{t}} $$ t t ¯ cross section as a function of $$m_{\text {jet}}$$ m jet is unfolded at the particle level and is used to test the modelling of highly boosted top quark production. The peak position of the $$m_{\text {jet}}$$ m jet distribution is sensitive to the top quark mass $$m_{{\mathrm{t}}}$$ m t , and the data are used to extract a value of $$m_{{\mathrm{t}}}$$ m t to assess this sensitivity.
Coexistence of microinvasive squamous cell carcinoma (MISCC) and microinvasive adenocarcinoma (MIAC) of the cervix is a rare phenomenon with very few clinically significant cases described in the ...literature. While a conservative approach has been studied, and may be effective in MISCC, a lower number of studies that recommend conservative treatment are available for MIAC. We report two cases of synchronous cervix lesions in two separate foci, MISCC and MIAC, who underwent fertility-sparing treatment with long-term follow-up. We describe clinical, histological, and immunohistochemical features of the two cases. The first case is a 41-year-old female with a diagnosis of MIAC of endocervical type, grade 1 differentiation, with a stromal invasion, associated with a separate area of squamous cell carcinoma (International Federation of Gynecology and Obstetrics/TNM stage: pT1a1G1). The second case is a 45-year-old female with a diagnosis of plurifocal MISCC, associated with an MIAC of endocervical type with a stromal invasion (International Federation of Gynecology and Obstetrics/TNM stage: pT1a1G1). After multidisciplinary counseling, both patients accepted conization as definitive treatment. Eleven years after the conization, all tests (Papanicolaou smear, colposcopy, cervical curettage, and hybrid capture 2-human papillomavirus test) planned quarterly in the first year and every 6 months in the subsequent years were negative in both patients. In women affected by stage IA1 squamous cervical cancer coexisting with stage IA1 adenocarcinoma endocervical type, with clear margins, and without lymphovascular space invasion, cervical conization may be considered a fertility-preserving, safe, and definitive therapeutic option.
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