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2,105 results on '"De Wolf, EA"'

1. Search for light Higgs bosons from supersymmetric cascade decays in pp collisions at s=13TeV.

Author: Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Mechelen, P Van, Putte, S Van, Remortel, N Van, Bols, ES, D'Hondt, J, De Moor, A, Delcourt, M, Faham, H El, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Vannerom, D, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Paredes, S, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Rendón, C, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, Hensel, C, Moraes, A, Teles, P Rebello, and Júnior, WL Aldá
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: A search is reported for pairs of light Higgs bosons (H1) produced in supersymmetric cascade decays in final states with small missing transverse momentum. A data set of LHC pp collisions collected with the CMS detector at s=13TeV and corresponding to an integrated luminosity of 138fb-1 is used. The search targets events where both H1 bosons decay into pairs that are reconstructed as large-radius jets using substructure techniques. No evidence is found for an excess of events beyond the background expectations of the standard model (SM). Results from the search are interpreted in the next-to-minimal supersymmetric extension of the SM, where a "singlino" of small mass leads to squark and gluino cascade decays that can predominantly end in a highly Lorentz-boosted singlet-like H1 and a singlino-like neutralino of small transverse momentum. Upper limits are set on the product of the squark or gluino pair production cross section and the square of the branching fraction of the H1 in a benchmark model containing almost mass-degenerate gluinos and light-flavour squarks. Under the assumption of an SM-like branching fraction, H1 bosons with masses in the range 40-120GeV arising from the decays of squarks or gluinos with a mass of 1200-2500GeV are excluded at 95% confidence level.
Published: 2023

2. CMS pythia 8 colour reconnection tunes based on underlying-event data.

Author: Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Mechelen, P Van, Putte, S Van, Remortel, N Van, Bols, ES, D'Hondt, J, Delcourt, M, Faham, H El, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Vannerom, D, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Paredes, S, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Rendón, C, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, Hensel, C, Moraes, A, Teles, P Rebello, Júnior, WL Aldá, and Pereira, M Alves Gallo
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: New sets of parameter tunes for two of the colour reconnection models, quantum chromodynamics-inspired and gluon-move, implemented in the pythia 8 event generator, are obtained based on the default CMS pythia 8 underlying-event tune, CP5. Measurements sensitive to the underlying event performed by the CMS experiment at centre-of-mass energies s=7 and 13TeV, and by the CDF experiment at 1.96TeV are used to constrain the parameters of colour reconnection models and multiple-parton interactions simultaneously. The new colour reconnection tunes are compared with various measurements at 1.96, 7, 8, and 13TeV including measurements of the underlying-event, strange-particle multiplicities, jet substructure observables, jet shapes, and colour flow in top quark pair (tt¯) events. The new tunes are also used to estimate the uncertainty related to colour reconnection modelling in the top quark mass measurement using the decay products of tt¯ events in the semileptonic channel at 13TeV.
Published: 2023

3. Observation of B0→ψ(2S)KS0π+π- and Bs0→ψ(2S)KS0 decays

Author: Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Mechelen, P Van, Putte, S Van, Remortel, N Van, Bols, ES, D’Hondt, J, De Moor, A, Delcourt, M, Faham, H El, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Vannerom, D, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Paredes, S, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Rendón, C, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, and Hensel, C
Subjects: Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Using a data sample of s = 13 TeV proton-proton collisions collected by the CMS experiment at the LHC in 2017 and 2018 with an integrated luminosity of 103 fb - 1 , the B s 0 → ψ ( 2S ) K S 0 and 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 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 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 B s 0 and B 0 mesons, f s / f d .
Published: 2022

4. Search for low-mass dilepton resonances in Higgs boson decays to four-lepton final states in proton–proton collisions at s=13TeV

Author: Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, and Hensel, C
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: A search for low-mass dilepton resonances in Higgs boson decays is conducted in the four-lepton final state. The decay is assumed to proceed via a pair of beyond the standard model particles, or one such particle and a Z boson. The search uses proton-proton collision data collected with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 137 fb - 1 , at a center-of-mass energy s = 13 TeV . No significant deviation from the standard model expectation is observed. Upper limits at 95% confidence level are set on model-independent Higgs boson decay branching fractions. Additionally, limits on dark photon and axion-like particle production, based on two specific models, are reported.
Published: 2022

5. Search for strongly interacting massive particles generating trackless jets in proton–proton collisions at s=13TeV

Author: Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, Hensel, C, and Moraes, A
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: A search for dark matter in the form of strongly interacting massive particles (SIMPs) using the CMS detector at the LHC is presented. The SIMPs would be produced in pairs that manifest themselves as pairs of jets without tracks. The energy fraction of jets carried by charged particles is used as a key discriminator to suppress efficiently the large multijet background, and the remaining background is estimated directly from data. The search is performed using proton-proton collision data corresponding to an integrated luminosity of 16.1 fb - 1 , collected with the CMS detector in 2016. No significant excess of events is observed above the expected background. For the simplified dark matter model under consideration, SIMPs with masses up to 100 GeV are excluded and further sensitivity is explored towards higher masses.
Published: 2022

6. Search for long-lived particles decaying to leptons with large impact parameter in proton–proton collisions at s=13Te

Author: Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Damanakis, K, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Schwarz, D, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, T, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Remortel, N Van, Blekman, F, Bols, ES, D’Hondt, J, Delcourt, M, El Faham, H, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Van Doninck, W, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Vermassen, B, Wezenbeek, L, Benecke, A, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, Alves, GA, Hensel, C, Moraes, A, and Júnior, WL Aldá
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: A search for new long-lived particles decaying to leptons using proton-proton collision data produced by the CERN LHC at s=13Te is presented. Events are selected with two leptons (an electron and a muon, two electrons, or two muons) that both have transverse impact parameter values between 0.01 and 10 cm and are not required to form a common vertex. Data used for the analysis were collected with the CMS detector in 2016, 2017, and 2018, and correspond to an integrated luminosity of 118 (113) fb-1 in the ee channel ( eμ and μμ channels). The search is designed to be sensitive to a wide range of models with displaced eμ , ee , and μμ final states. The results constrain several well-motivated models involving new long-lived particles that decay to displaced leptons. For some areas of the available phase space, these are the most stringent constraints to date.
Published: 2022

7. Measurements of the associated production of a W boson and a charm quark in proton-proton collisions at s=8TeV.

Author: Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, T, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Haevermaet, H Van, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, Zobec, J, Alves, GA, and Hensel, C
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: Measurements of the associated production of a W boson and a charm ( c ) quark in proton-proton collisions at a centre-of-mass energy of 8 TeV are reported. The analysis uses a data sample corresponding to a total integrated luminosity of 19.7 fb-1 collected by the CMS detector at the LHC. The W bosons are identified through their leptonic decays to an electron or a muon, and a neutrino. Charm quark jets are selected using distinctive signatures of charm hadron decays. The product of the cross section and branching fraction σ(pp→W+c+X)B(W→ℓν) , where ℓ=e or μ , and the cross section ratio σ(pp→W++c¯+X)/σ(pp→W-+c+X) are measured in a fiducial volume and differentially as functions of the pseudorapidity and of the transverse momentum of the lepton from the W boson decay. The results are compared with theoretical predictions. The impact of these measurements on the determination of the strange quark distribution is assessed.
Published: 2022

8. Precision luminosity measurement in proton–proton collisions at s=13TeV in 2015 and 2016 at CMS

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, D’Hondt, J, De Clercq, J, Delcourt, M, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Mestdach, G, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, Hensel, C, Moraes, A, Júnior, WL Aldá, Filho, M Barroso Ferreira, and Malbouisson, H Brandao
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: The measurement of the luminosity recorded by the CMS detector installed at LHC interaction point 5, using proton-proton collisions at s=13TeV in 2015 and 2016, is reported. The absolute luminosity scale is measured for individual bunch crossings using beam-separation scans (the van der Meer method), with a relative precision of 1.3 and 1.0% in 2015 and 2016, respectively. The dominant sources of uncertainty are related to residual differences between the measured beam positions and the ones provided by the operational settings of the LHC magnets, the factorizability of the proton bunch spatial density functions in the coordinates transverse to the beam direction, and the modeling of the effect of electromagnetic interactions among protons in the colliding bunches. When applying the van der Meer calibration to the entire run periods, the integrated luminosities when CMS was fully operational are 2.27 and 36.3 fb-1 in 2015 and 2016, with a relative precision of 1.6 and 1.2%, respectively. These are among the most precise luminosity measurements at bunched-beam hadron colliders.
Published: 2021

9. Search for a heavy vector resonance decaying to a Z boson and a Higgs boson in proton-proton collisions at s=13Te

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Müller, D, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, and Alves, GA
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: A search is presented for a heavy vector resonance decaying into a Z boson and the standard model Higgs boson, where the Z boson is identified through its leptonic decays to electrons, muons, or neutrinos, and the Higgs boson is identified through its hadronic decays. The search is performed in a Lorentz-boosted regime and is based on data collected from 2016 to 2018 at the CERN LHC, corresponding to an integrated luminosity of 137 fb-1 . Upper limits are derived on the production of a narrow heavy resonance Z' , and a mass below 3.5 and 3.7 Te is excluded at 95% confidence level in models where the heavy vector boson couples predominantly to fermions and to bosons, respectively. These are the most stringent limits placed on the Heavy Vector Triplet Z' model to date. If the heavy vector boson couples exclusively to standard model bosons, upper limits on the product of the cross section and branching fraction are set between 23 and 0.3 fb for a Z' mass between 0.8 and 4.6 Te , respectively. This is the first limit set on a heavy vector boson coupling exclusively to standard model bosons in its production and decay.
Published: 2021

10. Measurement of the Wγ Production Cross Section in Proton-Proton Collisions at s=13 TeV and Constraints on Effective Field Theory Coefficients

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Dragicevic, M, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, D’Hondt, J, De Clercq, J, Delcourt, M, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Mestdach, G, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, Hensel, C, Moraes, A, Júnior, WL Aldá, Filho, M Barroso Ferreira, Malbouisson, H Brandao, Carvalho, W, and Chinellato, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, hep-ex, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract: A fiducial cross section for Wγ production in proton-proton collisions is measured at a center-of-mass energy of 13 TeV in 137 fb^{-1} of data collected using the CMS detector at the LHC. The W→eν and μν decay modes are used in a maximum-likelihood fit to the lepton-photon invariant mass distribution to extract the combined cross section. The measured cross section is compared with theoretical expectations at next-to-leading order in quantum chromodynamics. In addition, 95% confidence level intervals are reported for anomalous triple-gauge couplings within the framework of effective field theory.
Published: 2021

11. Angular analysis of the decay B+ → K∗(892)+ μ + μ − in proton-proton collisions at √s = 8 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Escalante Del Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, CE, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Müller, D, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Mestdach, G, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, and Hensel, C
Subjects: B physics, Hadron-Hadron scattering, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract: Angular distributions of the decay B+→ K∗(892)+μ+μ− are studied using events collected with the CMS detector in s = 8 TeV proton-proton collisions at the LHC, corresponding to an integrated luminosity of 20.0 fb−1. The forward-backward asymmetry of the muons and the longitudinal polarization of the K∗(892)+ meson are determined as a function of the square of the dimuon invariant mass. These are the first results from this exclusive decay mode and are in agreement with a standard model prediction. [Figure not available: see fulltext.]
Published: 2021

12. Angular analysis of the decay B+→ K∗(892)+μ+μ− in proton-proton collisions at s = 8 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Escalante Del Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Müller, D, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Mestdach, G, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, and Hensel, C
Subjects: B physics, Hadron-Hadron scattering, hep-ex, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: Angular distributions of the decay B+→ K∗(892)+μ+μ− are studied using events collected with the CMS detector in s = 8 TeV proton-proton collisions at the LHC, corresponding to an integrated luminosity of 20.0 fb−1. The forward-backward asymmetry of the muons and the longitudinal polarization of the K∗(892)+ meson are determined as a function of the square of the dimuon invariant mass. These are the first results from this exclusive decay mode and are in agreement with a standard model prediction. [Figure not available: see fulltext.]
Published: 2021

13. Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s = 13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, CE, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, and Alves, GA
Subjects: Hadron-Hadron scattering, QCD, hep-ex, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: Measurements are presented of differential cross sections for the production of Z bosons in association with at least one jet initiated by a charm quark in pp collisions at s = 13 TeV. The data recorded by the CMS experiment at the LHC correspond to an integrated luminosity of 35.9 fb−1. The final states contain a pair of electrons or muons that are the decay products of a Z boson, and a jet consistent with being initiated by a charm quark produced in the hard interaction. Differential cross sections as a function of the transverse momentum pT of the Z boson and pT of the charm jet are compared with predictions from Monte Carlo event generators. The inclusive production cross section 405.4 ± 5.6 (stat) ± 24.3 (exp) ± 3.7 (theo) pb, is measured in a fiducial region requiring both leptons to have pseudorapidity |η| < 2.4 and pT> 10 GeV, at least one lepton with pT> 26 GeV, and a mass of the pair in the range 71–111 GeV, while the charm jet is required to have pT> 30 GeV and |η| < 2.4. These are the first measurements of these cross sections in proton-proton collisions at 13 TeV. [Figure not available: see fulltext.]
Published: 2021

14. Measurements of pp→ZZ production cross sections and constraints on anomalous triple gauge couplings at s=13TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, and Zobec, J
Subjects: CMS Collaboration, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: The production of Z boson pairs in proton-proton ( pp ) collisions, pp→(Z/γ∗)(Z/γ∗)→2ℓ2ℓ' , where ℓ,ℓ'=e or μ , is studied at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The data sample corresponds to an integrated luminosity of 137 fb-1 , collected during 2016-2018. The ZZ production cross section, σtot(pp→ZZ)=17.4±0.3(stat)±0.5(syst)±0.4(theo)±0.3(lumi) pb , measured for events with two pairs of opposite-sign, same-flavor leptons produced in the mass region 60
Published: 2021

15. Search for dark matter produced in association with a leptonically decaying Z boson in proton-proton collisions at s=13Te.

Author: Sirunyan, AM, CMS Collaboration, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Haevermaet, H Van, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, and Zobec, J
Subjects: CMS Collaboration, hep-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract: A search for dark matter particles is performed using events with a Z boson candidate and large missing transverse momentum. The analysis is based on proton-proton collision data at a center-of-mass energy of 13 Te , collected by the CMS experiment at the LHC in 2016-2018, corresponding to an integrated luminosity of 137 fb-1 . The search uses the decay channels Z→ee and Z→μμ . No significant excess of events is observed over the background expected from the standard model. Limits are set on dark matter particle production in the context of simplified models with vector, axial-vector, scalar, and pseudoscalar mediators, as well as on a two-Higgs-doublet model with an additional pseudoscalar mediator. In addition, limits are provided for spin-dependent and spin-independent scattering cross sections and are compared to those from direct-detection experiments. The results are also interpreted in the context of models of invisible Higgs boson decays, unparticles, and large extra dimensions.
Published: 2021

16. Search for top squark pair production using dilepton final states in pp collision data collected at s=13TeV.

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Haevermaet, H Van, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, and Zobec, J
Subjects: CMS Collaboration, hep-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract: A search is presented for supersymmetric partners of the top quark (top squarks) in final states with two oppositely charged leptons (electrons or muons), jets identified as originating from b quarks, and missing transverse momentum. The search uses data from proton-proton collisions at s=13TeV collected with the CMS detector, corresponding to an integrated luminosity of 137 fb-1 . Hypothetical signal events are efficiently separated from the dominant top quark pair production background with requirements on the significance of the missing transverse momentum and on transverse mass variables. No significant deviation is observed from the expected background. Exclusion limits are set in the context of simplified supersymmetric models with pair-produced lightest top squarks. For top squarks decaying exclusively to a top quark and a lightest neutralino, lower limits are placed at 95% confidence level on the masses of the top squark and the neutralino up to 925 and 450 GeV , respectively. If the decay proceeds via an intermediate chargino, the corresponding lower limits on the mass of the lightest top squark are set up to 850 GeV for neutralino masses below 420 GeV . For top squarks undergoing a cascade decay through charginos and sleptons, the mass limits reach up to 1.4 TeV and 900 GeV respectively for the top squark and the lightest neutralino.
Published: 2021

17. Measurement of differential cross sections for Z bosons produced in association with charm jets in pp collisions at √s=13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Eroe, J, Del Valle, A Escalante, Flechl, M, Fruehwirth, R, Ghete, VM, Hrubec, J, Jeitler, M, Krammer, N, Kraetschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Rohringer, H, Schieck, J, Schoefbeck, R, Spanring, M, Spitzbart, D, Taurok, A, Waltenberger, W, Wittmann, J, Wulz, C-E, Zarucki, M, Chekhovsky, V, Mossolov, V, Gonzalez, J Suarez, De Wolf, EA, Di Croce, D, Janssen, X, Lauwers, J, Pieters, M, Van de Klundert, M, Van Haevermaet, H, Van Mechelen, P, Van Remortel, N, Abu Zeid, S, Blekman, F, D'Hondt, J, De Bruyn, I, De Clercq, J, Deroover, K, Flouris, G, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Fasanella, G, Favart, L, Goldouzian, R, Grebenyuk, A, Kalsi, AK, Lenzi, T, Luetic, J, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Fagot, A, Gul, M, Khvastunov, I, Poyraz, D, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, and Bakhshiansohi, H
Subjects: Hadron-Hadron scattering, QCD, hep-ex, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: Measurements are presented of differential cross sections for the production of Z bosons in association with at least one jet initiated by a charm quark in pp collisions at s = 13 TeV. The data recorded by the CMS experiment at the LHC correspond to an integrated luminosity of 35.9 fb−1. The final states contain a pair of electrons or muons that are the decay products of a Z boson, and a jet consistent with being initiated by a charm quark produced in the hard interaction. Differential cross sections as a function of the transverse momentum pT of the Z boson and pT of the charm jet are compared with predictions from Monte Carlo event generators. The inclusive production cross section 405.4 ± 5.6 (stat) ± 24.3 (exp) ± 3.7 (theo) pb, is measured in a fiducial region requiring both leptons to have pseudorapidity |η| < 2.4 and pT> 10 GeV, at least one lepton with pT> 26 GeV, and a mass of the pair in the range 71–111 GeV, while the charm jet is required to have pT> 30 GeV and |η| < 2.4. These are the first measurements of these cross sections in proton-proton collisions at 13 TeV. [Figure not available: see fulltext.]
Published: 2021

18. Measurements of production cross sections of the Higgs boson in the four-lepton final state in proton-proton collisions at s=13TeV.

Author: CMS Collaboration, Sirunyan, AM, Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Dragicevic, M, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, D'Hondt, J, De Clercq, J, Delcourt, M, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Mestdach, G, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Alves, GA, Hensel, C, Moraes, A, Júnior, WL Aldá, Filho, M Barroso Ferreira, Malbouisson, H Brandao, and Carvalho, W
Subjects: CMS Collaboration, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: Production cross sections of the Higgs boson are measured in the H→ZZ→4ℓ ( ℓ=e,μ ) decay channel. A data sample of proton-proton collisions at a center-of-mass energy of 13 TeV , collected by the CMS detector at the LHC and corresponding to an integrated luminosity of 137 fb-1 is used. The signal strength modifier μ , defined as the ratio of the Higgs boson production rate in the 4ℓ channel to the standard model (SM) expectation, is measured to be μ=0.94±0.07(stat)-0.08+0.09(syst) at a fixed value of mH=125.38GeV . The signal strength modifiers for the individual Higgs boson production modes are also reported. The inclusive fiducial cross section for the H→4ℓ process is measured to be 2.84-0.22+0.23(stat)-0.21+0.26(syst)fb , which is compatible with the SM prediction of 2.84±0.15fb for the same fiducial region. Differential cross sections as a function of the transverse momentum and rapidity of the Higgs boson, the number of associated jets, and the transverse momentum of the leading associated jet are measured. A new set of cross section measurements in mutually exclusive categories targeted to identify production mechanisms and kinematical features of the events is presented. The results are in agreement with the SM predictions.
Published: 2021

19. MUSiC: a model-unspecific search for new physics in proton-proton collisions at s=13TeV.

Author: CMS Collaboration, Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Haevermaet, H Van, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, and Wuyckens, S
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: Results of the Model Unspecific Search in CMS (MUSiC), using proton-proton collision data recorded at the LHC at a centre-of-mass energy of 13 TeV , corresponding to an integrated luminosity of 35.9 fb-1 , are presented. The MUSiC analysis searches for anomalies that could be signatures of physics beyond the standard model. The analysis is based on the comparison of observed data with the standard model prediction, as determined from simulation, in several hundred final states and multiple kinematic distributions. Events containing at least one electron or muon are classified based on their final state topology, and an automated search algorithm surveys the observed data for deviations from the prediction. The sensitivity of the search is validated using multiple methods. No significant deviations from the predictions have been observed. For a wide range of final state topologies, agreement is found between the data and the standard model simulation. This analysis complements dedicated search analyses by significantly expanding the range of final states covered using a model independent approach with the largest data set to date to probe phase space regions beyond the reach of previous general searches.
Published: 2021

20. Search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector boson pairs in proton-proton collisions at s=13TeV.

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Dragicevic, M, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Sfar, H Rejeb, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, D'Hondt, J, De Clercq, J, Delcourt, M, El Faham, H, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vanden Bemden, M, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, and Wertz, S
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: A search for charged Higgs bosons produced in vector boson fusion processes and decaying into vector bosons, using proton-proton collisions at s=13TeV at the LHC, is reported. The data sample corresponds to an integrated luminosity of 137 fb-1 collected with the CMS detector. Events are selected by requiring two or three electrons or muons, moderate missing transverse momentum, and two jets with a large rapidity separation and a large dijet mass. No excess of events with respect to the standard model background predictions is observed. Model independent upper limits at 95% confidence level are reported on the product of the cross section and branching fraction for vector boson fusion production of charged Higgs bosons as a function of mass, from 200 to 3000 GeV . The results are interpreted in the context of the Georgi-Machacek model.
Published: 2021

21. Development and validation of HERWIG 7 tunes from CMS underlying-event measurements.

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, and Wuyckens, S
Subjects: CMS Collaboration, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: This paper presents new sets of parameters ("tunes") for the underlying-event model of the HERWIG7 event generator. These parameters control the description of multiple-parton interactions (MPI) and colour reconnection in HERWIG7 , and are obtained from a fit to minimum-bias data collected by the CMS experiment at s=0.9 , 7, and 13Te . The tunes are based on the NNPDF 3.1 next-to-next-to-leading-order parton distribution function (PDF) set for the parton shower, and either a leading-order or next-to-next-to-leading-order PDF set for the simulation of MPI and the beam remnants. Predictions utilizing the tunes are produced for event shape observables in electron-positron collisions, and for minimum-bias, inclusive jet, top quark pair, and Z and W boson events in proton-proton collisions, and are compared with data. Each of the new tunes describes the data at a reasonable level, and the tunes using a leading-order PDF for the simulation of MPI provide the best description of the data.
Published: 2021

22. Measurement of the Higgs boson production rate in association with top quarks in final states with electrons, muons, and hadronically decaying tau leptons at s=13TeV.

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Haevermaet, H Van, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Müller, D, Python, Q, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Faham, H El, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, and Wuyckens, S
Subjects: CMS Collaboration, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: The rate for Higgs ( H ) bosons production in association with either one ( tH ) or two ( tt¯H ) top quarks is measured in final states containing multiple electrons, muons, or tau leptons decaying to hadrons and a neutrino, using proton-proton collisions recorded at a center-of-mass energy of 13TeV by the CMS experiment. The analyzed data correspond to an integrated luminosity of 137 fb-1 . The analysis is aimed at events that contain H→WW , H→ττ , or H→ZZ decays and each of the top quark(s) decays either to lepton+jets or all-jet channels. Sensitivity to signal is maximized by including ten signatures in the analysis, depending on the lepton multiplicity. The separation among tH , tt¯H , and the backgrounds is enhanced through machine-learning techniques and matrix-element methods. The measured production rates for the tt¯H and tH signals correspond to 0.92±0.19(stat)-0.13+0.17(syst) and 5.7±2.7(stat)±3.0(syst) of their respective standard model (SM) expectations. The corresponding observed (expected) significance amounts to 4.7 (5.2) standard deviations for tt¯H , and to 1.4 (0.3) for tH production. Assuming that the Higgs boson coupling to the tau lepton is equal in strength to its expectation in the SM, the coupling yt of the Higgs boson to the top quark divided by its SM expectation, κt=yt/ytSM , is constrained to be within -0.9
Published: 2021

23. Combined searches for the production of supersymmetric top quark partners in proton-proton collisions at s=13Te.

Author: Tumasyan, A, Adam, W, Andrejkovic, JW, Bergauer, T, Chatterjee, S, Dragicevic, M, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Mikulec, I, Paulitsch, P, Pitters, FM, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Janssen, X, Kello, T, Lelek, A, Sfar, H Rejeb, Mechelen, P Van, Putte, S Van, Van Remortel, N, Blekman, F, Bols, ES, D'Hondt, J, De Clercq, J, Delcourt, M, El Faham, H, Lowette, S, Moortgat, S, Morton, A, Müller, D, Sahasransu, AR, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lee, K, Mahdavikhorrami, M, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Bemden, M Vanden, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Knolle, J, Lambrecht, L, Mestdach, G, Niedziela, M, Roskas, C, Samalan, A, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bethani, A, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Donertas, IS, Giammanco, A, Jaffel, K, Jain, Sa, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Tran, TT, Vischia, P, Wertz, S, and Alves, GA
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: A combination of searches for top squark pair production using proton-proton collision data at a center-of-mass energy of 13 Te at the CERN LHC, corresponding to an integrated luminosity of 137 fb-1 collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented. Depending on the model, the combined result excludes a top squark mass up to 1325 Ge for a massless neutralino, and a neutralino mass up to 700 Ge for a top squark mass of 1150 Ge . Top squarks with masses from 145 to 295 Ge , for neutralino masses from 0 to 100 Ge , with a mass difference between the top squark and the neutralino in a window of 30 Ge around the mass of the top quark, are excluded for the first time with CMS data. The results of theses searches are also interpreted in an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair. Upper limits are set on the cross section for mediator particle masses of up to 420 Ge .
Published: 2021

24. Measurements of angular distance and momentum ratio distributions in three-jet and Z + two-jet final states in pp collisions.

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulecc, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wertz, S, Wuyckens, S, Zobec, J, and Alves, GA
Subjects: CMS Collaboration, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: Collinear (small-angle) and large-angle, as well as soft and hard radiations are investigated in three-jet and Z + two-jet events collected in proton-proton collisions at the LHC. The normalized production cross sections are measured as a function of the ratio of transverse momenta of two jets and their angular separation. The measurements in the three-jet and Z + two-jet events are based on data collected at a center-of-mass energy of 8 TeV , corresponding to an integrated luminosity of 19.8 fb-1 . The Z + two-jet events are reconstructed in the dimuon decay channel of the Z boson. The three-jet measurement is extended to include s=13TeV data corresponding to an integrated luminosity of 2.3 fb-1 . The results are compared to predictions from event generators that include parton showers, multiple parton interactions, and hadronization. The collinear and soft regions are in general well described by parton showers, whereas the regions of large angular separation are often best described by calculations using higher-order matrix elements.
Published: 2021

25. A Deep Neural Network for Simultaneous Estimation of b Jet Energy and Resolution

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Valle, A Escalante Del, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, C-E, Zarucki, M, Drugakov, V, Mossolov, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Croce, D Di, Janssen, X, Lelek, A, Pieters, M, Sfar, H Rejeb, Haevermaet, H Van, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Marono, M Vidal, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Silva, G Correia, Hensel, C, Moraes, A, Teles, P Rebello, Chagas, E Belchior Batista Das, Carvalho, W, Chinellato, J, and Coelho, E
Subjects: CMS Collaboration, CMS, Deep learning, Higgs boson, Jet energy, Jet resolution, b jets, physics.data-an, hep-ex
Abstract: We describe a method to obtain point and dispersion estimates for the energies of jets arising from b quarks produced in proton-proton collisions at an energy of s=13TeV at the CERN LHC. The algorithm is trained on a large sample of simulated b jets and validated on data recorded by the CMS detector in 2017 corresponding to an integrated luminosity of 41 fb-1 . A multivariate regression algorithm based on a deep feed-forward neural network employs jet composition and shape information, and the properties of reconstructed secondary vertices associated with the jet. The results of the algorithm are used to improve the sensitivity of analyses that make use of b jets in the final state, such as the observation of Higgs boson decay to bb¯ .
Published: 2020

26. Measurement of single-diffractive dijet production in proton–proton collisions at s=8Te with the CMS and TOTEM experiments

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Valle, A Escalante Del, Flechl, M, Frühwirth, R, Ghete, VM, Hrubec, J, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Rohringer, H, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wittmann, J, Wulz, C-E, Zarucki, M, Chekhovsky, V, Mossolov, V, Gonzalez, J Suarez, De Wolf, EA, Croce, D Di, Janssen, X, Lauwers, J, Lelek, A, Pieters, M, Haevermaet, H Van, Mechelen, P Van, Remortel, N Van, Zeid, S Abu, Blekman, F, D’Hondt, J, De Clercq, J, Deroover, K, Flouris, G, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Doninck, W Van, Mulders, P Van, Parijs, I Van, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Fasanella, G, Favart, L, Grebenyuk, A, Kalsi, AK, Lenzi, T, Luetic, J, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Fagot, A, Gul, M, Khvastunov, I, Poyraz, D, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bakhshiansohi, H, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, and Giammanco, A
Subjects: CMS and TOTEM Collaborations, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: Measurements are presented of the single-diffractive dijet cross section and the diffractive cross section as a function of the proton fractional momentum loss ξ and the four-momentum transfer squared t. Both processes pp→pX and pp→Xp , i.e. with the proton scattering to either side of the interaction point, are measured, where X includes at least two jets; the results of the two processes are averaged. The analyses are based on data collected simultaneously with the CMS and TOTEM detectors at the LHC in proton-proton collisions at s=8Te during a dedicated run with β∗=90m at low instantaneous luminosity and correspond to an integrated luminosity of 37.5nb-1 . The single-diffractive dijet cross section σjjpX , in the kinematic region ξ40Ge , and pseudorapidity |η|
Published: 2020

27. Evidence for Top Quark Production in Nucleus-Nucleus Collisions

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, Zobec, J, Alves, GA, and Silva, G Correia
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS Collaboration, hep-ex, nucl-ex, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract: Ultrarelativistic heavy ion collisions recreate in the laboratory the thermodynamical conditions prevailing in the early universe up to 10^{-6} sec, thereby allowing the study of the quark-gluon plasma (QGP), a state of quantum chromodynamics (QCD) matter with deconfined partons. The top quark, the heaviest elementary particle known, is accessible in nucleus-nucleus collisions at the CERN LHC, and constitutes a novel probe of the QGP. Here, we report the first evidence for the production of top quarks in nucleus-nucleus collisions, using lead-lead collision data at a nucleon-nucleon center-of-mass energy of 5.02 TeV recorded by the CMS experiment. Two methods are used to measure the cross section for top quark pair production (σ_{tt[over ¯]}) via the selection of charged leptons (electrons or muons) and bottom quarks. One method relies on the leptonic information alone, and the second one exploits, in addition, the presence of bottom quarks. The measured cross sections, σ_{tt[over ¯]}=2.54_{-0.74}^{+0.84} and 2.03_{-0.64}^{+0.71} μb, respectively, are compatible with expectations from scaled proton-proton data and QCD predictions.
Published: 2020

28. Measurements of production cross sections of WZ and same-sign WW boson pairs in association with two jets in proton-proton collisions at s=13TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, CE, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, and Zobec, J
Subjects: CMS, Physics, Diboson, Electroweak, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: Measurements of production cross sections of WZ and same-sign WW boson pairs in association with two jets in proton-proton collisions at s=13TeV at the LHC are reported. The data sample corresponds to an integrated luminosity of 137fb−1, collected with the CMS detector during 2016–2018. The measurements are performed in the leptonic decay modes [Formula presented] and [Formula presented], where ℓ,ℓ′=e, [Formula presented]. Differential fiducial cross sections as functions of the invariant masses of the jet and charged lepton pairs, as well as of the leading-lepton transverse momentum, are measured for W±W± production and are consistent with the standard model predictions. The dependence of differential cross sections on the invariant mass of the jet pair is also measured for WZ production. An observation of electroweak production of WZ boson pairs is reported with an observed (expected) significance of 6.8 (5.3) standard deviations. Constraints are obtained on the structure of quartic vector boson interactions in the framework of effective field theory.
Published: 2020

29. Measurements of production cross sections of WZ and same-sign WW boson pairs in association with two jets in proton-proton collisions at s = 13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Del Valle, A Escalante, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, and Zobec, J
Subjects: CMS, Physics, Diboson, Electroweak, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: Measurements of production cross sections of WZ and same-sign WW boson pairs in association with two jets in proton-proton collisions at s=13TeV at the LHC are reported. The data sample corresponds to an integrated luminosity of 137fb−1, collected with the CMS detector during 2016–2018. The measurements are performed in the leptonic decay modes [Formula presented] and [Formula presented], where ℓ,ℓ′=e, [Formula presented]. Differential fiducial cross sections as functions of the invariant masses of the jet and charged lepton pairs, as well as of the leading-lepton transverse momentum, are measured for W±W± production and are consistent with the standard model predictions. The dependence of differential cross sections on the invariant mass of the jet pair is also measured for WZ production. An observation of electroweak production of WZ boson pairs is reported with an observed (expected) significance of 6.8 (5.3) standard deviations. Constraints are obtained on the structure of quartic vector boson interactions in the framework of effective field theory.
Published: 2020

30. Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at s=13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Moureaux, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vischia, P, Zobec, J, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Belchior Batista Das Chagas, E, Carvalho, W, Chinellato, J, Coelho, E, Da Costa, EM, Da Silveira, GG, and De Jesus Damiao, D
Subjects: CMS, Physics, CKM matrix, Top quark, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: The first direct, model-independent measurement is presented of the modulus of the Cabibbo–Kobayashi–Maskawa (CKM) matrix elements |η|Vtb, |η|Vtd, and |η|Vts, in final states enriched in single top quark t-channel events. The analysis uses proton-proton collision data from the LHC, collected during 2016 by the CMS experiment, at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. Processes directly sensitive to these matrix elements are considered at both the production and decay vertices of the top quark. In the standard model hypothesis of CKM unitarity, a lower limit of |η|Vtb>0.970 is measured at the 95% confidence level. Several theories beyond the standard model are considered, and by releasing all constraints among the involved parameters, the values |η|Vtb=0.988±0.024, and |η|Vtd2+|η|Vts2=0.06±0.06, where the uncertainties include both statistical and systematic components, are measured.
Published: 2020

31. Measurement of the Y(1S) pair production cross section and search for resonances decaying to Y(1S)μ+μ− in proton-proton collisions at s=13TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Moureaux, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Belchior Batista Das Chagas, E, Carvalho, W, Chinellato, J, Coelho, E, Da Costa, EM, and Da Silveira, GG
Subjects: CMS, Upsilon, Clinical Research, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: The fiducial cross section for Y(1S) pair production in proton-proton collisions at a center-of-mass energy of 13 TeV in the region where both Y(1S) mesons have an absolute rapidity below 2.0 is measured to be 79±11(stat)±6(syst)±3(B) pb assuming the mesons are produced unpolarized. The last uncertainty corresponds to the uncertainty in the Y(1S) meson dimuon branching fraction. The measurement is performed in the final state with four muons using proton-proton collision data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9fb−1. This process serves as a standard model reference in a search for narrow resonances decaying to Y(1S)μ+μ− in the same final state. Such a resonance could indicate the existence of a tetraquark that is a bound state of two b quarks and two b¯ antiquarks. The tetraquark search is performed for masses in the vicinity of four times the bottom quark mass, between 17.5 and 19.5 GeV, while a generic search for other resonances is performed for masses between 16.5 and 27 GeV. No significant excess of events compatible with a narrow resonance is observed in the data. Limits on the production cross section times branching fraction to four muons via an intermediate Y(1S) resonance are set as a function of the resonance mass.
Published: 2020

32. Search for supersymmetry in proton-proton collisions at s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, C-E, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, and Zobec, J
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, Hadron-Hadron scattering, Supersymmetry, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Mathematical physics, Nuclear and plasma physics, Particle and high energy physics
Abstract: A search for new physics in events with two highly Lorentz-boosted Z bosons and large missing transverse momentum is presented. The analyzed proton-proton collision data, corresponding to an integrated luminosity of 137 fb−1, were recorded at s = 13 TeV by the CMS experiment at the CERN LHC. The search utilizes the substructure of jets with large radius to identify quark pairs from Z boson decays. Backgrounds from standard model processes are suppressed by requirements on the jet mass and the missing transverse momentum. No significant excess in the event yield is observed beyond the number of background events expected from the standard model. For a simplified supersymmetric model in which the Z bosons arise from the decay of gluinos, an exclusion limit of 1920 GeV on the gluino mass is set at 95% confidence level. This is the first search for beyond-standard-model production of pairs of boosted Z bosons plus large missing transverse momentum. [Figure not available: see fulltext.]
Published: 2020

33. Measurement of the Y(1S) pair production cross section and search for resonances decaying to Y(1S)μ+μ− in proton-proton collisions at s = 13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Del Valle, A Escalante, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Waltenberger, W, Wulz, C-E, Zarucki, M, Drugakov, V, Mossolov, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Moureaux, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Marono, M Vidal, Vischia, P, Zobec, J, Alves, GA, Silva, G Correia, Hensel, C, Moraes, A, Chagas, E Belchior Batista Das, Carvalho, W, Chinellato, J, Coelho, E, Da Costa, EM, and Da Silveira, GG
Subjects: Clinical Research, CMS, Upsilon, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: The fiducial cross section for Y(1S) pair production in proton-proton collisions at a center-of-mass energy of 13 TeV in the region where both Y(1S) mesons have an absolute rapidity below 2.0 is measured to be 79±11(stat)±6(syst)±3(B) pb assuming the mesons are produced unpolarized. The last uncertainty corresponds to the uncertainty in the Y(1S) meson dimuon branching fraction. The measurement is performed in the final state with four muons using proton-proton collision data collected in 2016 by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9fb−1. This process serves as a standard model reference in a search for narrow resonances decaying to Y(1S)μ+μ− in the same final state. Such a resonance could indicate the existence of a tetraquark that is a bound state of two b quarks and two b¯ antiquarks. The tetraquark search is performed for masses in the vicinity of four times the bottom quark mass, between 17.5 and 19.5 GeV, while a generic search for other resonances is performed for masses between 16.5 and 27 GeV. No significant excess of events compatible with a narrow resonance is observed in the data. Limits on the production cross section times branching fraction to four muons via an intermediate Y(1S) resonance are set as a function of the resonance mass.
Published: 2020

34. Measurement of CKM matrix elements in single top quark t-channel production in proton-proton collisions at s = 13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Del Valle, A Escalante, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Waltenberger, W, Wulz, C-E, Zarucki, M, Drugakov, V, Mossolov, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Moureaux, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vischia, P, Zobec, J, Alves, GA, Silva, G Correia, Hensel, C, Moraes, A, Chagas, E Belchior Batista Das, Carvalho, W, Chinellato, J, Coelho, E, Da Costa, EM, Da Silveira, GG, and De Jesus Damiao, D
Subjects: CMS, Physics, CKM matrix, Top quark, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: The first direct, model-independent measurement is presented of the modulus of the Cabibbo–Kobayashi–Maskawa (CKM) matrix elements |η|Vtb, |η|Vtd, and |η|Vts, in final states enriched in single top quark t-channel events. The analysis uses proton-proton collision data from the LHC, collected during 2016 by the CMS experiment, at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb−1. Processes directly sensitive to these matrix elements are considered at both the production and decay vertices of the top quark. In the standard model hypothesis of CKM unitarity, a lower limit of |η|Vtb>0.970 is measured at the 95% confidence level. Several theories beyond the standard model are considered, and by releasing all constraints among the involved parameters, the values |η|Vtb=0.988±0.024, and |η|Vtd2+|η|Vts2=0.06±0.06, where the uncertainties include both statistical and systematic components, are measured.
Published: 2020

35. Search for supersymmetry in proton-proton collisions at √s = 13 TeV in events with high-momentum Z bosons and missing transverse momentum

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Frühwirth, R, Jeitler, M, Krammer, N, Lechner, L, Liko, D, Madlener, T, Mikulec, I, Pitters, FM, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Templ, S, Waltenberger, W, Wulz, CE, Zarucki, M, Chekhovsky, V, Litomin, A, Makarenko, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Kello, T, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Morton, A, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Makarenko, I, Moureaux, L, Pétré, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wezenbeek, L, Cornelis, T, Dobur, D, Gruchala, M, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bruno, G, Bury, F, Caputo, C, David, P, Delaere, C, Delcourt, M, Donertas, IS, Giammanco, A, Lemaitre, V, Mondal, K, Prisciandaro, J, Taliercio, A, Teklishyn, M, Vischia, P, Wuyckens, S, and Zobec, J
Subjects: Hadron-Hadron scattering, Supersymmetry, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics
Abstract: A search for new physics in events with two highly Lorentz-boosted Z bosons and large missing transverse momentum is presented. The analyzed proton-proton collision data, corresponding to an integrated luminosity of 137 fb−1, were recorded at s = 13 TeV by the CMS experiment at the CERN LHC. The search utilizes the substructure of jets with large radius to identify quark pairs from Z boson decays. Backgrounds from standard model processes are suppressed by requirements on the jet mass and the missing transverse momentum. No significant excess in the event yield is observed beyond the number of background events expected from the standard model. For a simplified supersymmetric model in which the Z bosons arise from the decay of gluinos, an exclusion limit of 1920 GeV on the gluino mass is set at 95% confidence level. This is the first search for beyond-standard-model production of pairs of boosted Z bosons plus large missing transverse momentum. [Figure not available: see fulltext.]
Published: 2020

36. Study of central exclusive [InlineEquation not available: see fulltext.] production in proton-proton collisions at √s=5.02 and 13TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Del Valle, AE, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wittmann, J, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Gonzalez, JS, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lauwers, J, Lelek, A, Pieters, M, Sfar, HR, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Luetic, J, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, CV, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Khvastunov, I, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Krintiras, G, Lemaitre, V, Magitteri, A, Piotrzkowski, K, Prisciandaro, J, Saggio, A, and Marono, MV
Subjects: Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: Central exclusive and semiexclusive production of [InlineEquation not available: see fulltext.] pairs is measured with the CMS detector in proton-proton collisions at the LHC at center-of-mass energies of 5.02 and 13TeV. The theoretical description of these nonperturbative processes, which have not yet been measured in detail at the LHC, poses a significant challenge to models. The two pions are measured and identified in the CMS silicon tracker based on specific energy loss, whereas the absence of other particles is ensured by calorimeter information. The total and differential cross sections of exclusive and semiexclusive central [InlineEquation not available: see fulltext.] production are measured as functions of invariant mass, transverse momentum, and rapidity of the [InlineEquation not available: see fulltext.] system in the fiducial region defined as transverse momentum [InlineEquation not available: see fulltext.] and pseudorapidity [InlineEquation not available: see fulltext.]. The production cross sections for the four resonant channels [InlineMediaObject not available: see fulltext.], [InlineEquation not available: see fulltext.], [InlineMediaObject not available: see fulltext.], and [InlineMediaObject not available: see fulltext.]are extracted using a simple model. These results represent the first measurement of this process at the LHC collision energies of 5.02 and 13TeV.
Published: 2020

37. Search for physics beyond the standard model in events with jets and two same-sign or at least three charged leptons in proton-proton collisions at s=13TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Waltenberger, W, Wulz, C-E, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Mechelen, P Van, Putte, S Van, Remortel, N Van, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Doninck, W Van, Mulders, P Van, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Moureaux, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Das Chagas, E Belchior Batista, Carvalho, W, Chinellato, J, Coelho, E, Da Costa, EM, and Da Silveira, GG
Subjects: CMS Collaboration, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics
Abstract: A data sample of events from proton-proton collisions with at least two jets, and two isolated same-sign or three or more charged leptons, is studied in a search for signatures of new physics phenomena. The data correspond to an integrated luminosity of 137fb-1 at a center-of-mass energy of 13TeV , collected in 2016-2018 by the CMS experiment at the LHC. The search is performed using a total of 168 signal regions defined using several kinematic variables. The properties of the events are found to be consistent with the expectations from standard model processes. Exclusion limits at 95% confidence level are set on cross sections for the pair production of gluinos or squarks for various decay scenarios in the context of supersymmetric models conserving or violating R parity. The observed lower mass limits are as large as 2.1TeV for gluinos and 0.9TeV for top and bottom squarks. To facilitate reinterpretations, model-independent limits are provided in a set of simplified signal regions.
Published: 2020

38. Measurement of tt¯ normalised multi-differential cross sections in pp collisions at s=13TeV, and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Del Valle, A Escalante, Flechl, M, Frühwirth, R, Ghete, VM, Hrubec, J, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Rohringer, H, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wittmann, J, Wulz, C-E, Zarucki, M, Chekhovsky, V, Mossolov, V, Gonzalez, J Suarez, De Wolf, EA, Di Croce, D, Janssen, X, Lauwers, J, Lelek, A, Pieters, M, Van Haevermaet, H, Van Mechelen, P, Van Remortel, N, Blekman, F, D’Hondt, J, De Clercq, J, Deroover, K, Flouris, G, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Fasanella, G, Favart, L, Grebenyuk, A, Kalsi, AK, Luetic, J, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Fagot, A, Gul, M, Khvastunov, I, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Krintiras, G, Lemaitre, V, and Magitteri, A
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, hep-ex, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Atomic, molecular and optical physics, Particle and high energy physics
Abstract: Normalised multi-differential cross sections for top quark pair (t t ¯) production are measured in proton-proton collisions at a centre-of-mass energy of 13TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9fb-1. The double-differential t t ¯ cross section is measured as a function of the kinematic properties of the top quark and of the t t ¯ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the t t ¯ system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength αS and the top quark pole mass (mtpole) using several sets of parton distribution functions (PDFs). The measurement of mtpole exploits the sensitivity of the t t ¯ invariant mass distribution to mtpole near the production threshold. Furthermore, a simultaneous fit of the PDFs, αS, and mtpole is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of αS and mtpole. The values αS(mZ)=0.1135-0.0017+0.0021 and mtpole=170.5±0.8GeV are extracted, which account for experimental and theoretical uncertainties, the latter being estimated from NLO scale variations. Possible effects from Coulomb and soft-gluon resummation near the t t ¯ production threshold are neglected in these parameter extractions. A rough estimate of these effects indicates an expected correction of mtpole of the order of +1GeV, which can be regarded as additional theoretical uncertainty in the current mtpole extraction.
Published: 2020

39. Measurement of t t ¯ normalised multi-differential cross sections in pp collisions at √s=13TeV , and simultaneous determination of the strong coupling strength, top quark pole mass, and parton distribution functions

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Del Valle, AE, Flechl, M, Frühwirth, R, Ghete, VM, Hrubec, J, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Rohringer, H, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wittmann, J, Wulz, CE, Zarucki, M, Chekhovsky, V, Mossolov, V, Gonzalez, JS, De Wolf, EA, Di Croce, D, Janssen, X, Lauwers, J, Lelek, A, Pieters, M, Van Haevermaet, H, Van Mechelen, P, Van Remortel, N, Blekman, F, D’Hondt, J, De Clercq, J, Deroover, K, Flouris, G, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Fasanella, G, Favart, L, Grebenyuk, A, Kalsi, AK, Luetic, J, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, CV, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Fagot, A, Gul, M, Khvastunov, I, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Krintiras, G, Lemaitre, V, and Magitteri, A
Subjects: hep-ex, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: Normalised multi-differential cross sections for top quark pair (t t ¯) production are measured in proton-proton collisions at a centre-of-mass energy of 13TeV using events containing two oppositely charged leptons. The analysed data were recorded with the CMS detector in 2016 and correspond to an integrated luminosity of 35.9fb-1. The double-differential t t ¯ cross section is measured as a function of the kinematic properties of the top quark and of the t t ¯ system at parton level in the full phase space. A triple-differential measurement is performed as a function of the invariant mass and rapidity of the t t ¯ system and the multiplicity of additional jets at particle level. The data are compared to predictions of Monte Carlo event generators that complement next-to-leading-order (NLO) quantum chromodynamics (QCD) calculations with parton showers. Together with a fixed-order NLO QCD calculation, the triple-differential measurement is used to extract values of the strong coupling strength αS and the top quark pole mass (mtpole) using several sets of parton distribution functions (PDFs). The measurement of mtpole exploits the sensitivity of the t t ¯ invariant mass distribution to mtpole near the production threshold. Furthermore, a simultaneous fit of the PDFs, αS, and mtpole is performed at NLO, demonstrating that the new data have significant impact on the gluon PDF, and at the same time allow an accurate determination of αS and mtpole. The values αS(mZ)=0.1135-0.0017+0.0021 and mtpole=170.5±0.8GeV are extracted, which account for experimental and theoretical uncertainties, the latter being estimated from NLO scale variations. Possible effects from Coulomb and soft-gluon resummation near the t t ¯ production threshold are neglected in these parameter extractions. A rough estimate of these effects indicates an expected correction of mtpole of the order of +1GeV, which can be regarded as additional theoretical uncertainty in the current mtpole extraction.
Published: 2020

40. A measurement of the Higgs boson mass in the diphoton decay channel

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Moureaux, L, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Skovpen, K, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Belchior Batista Das Chagas, E, Carvalho, W, Chinellato, J, Coelho, E, Da Costa, EM, and Da Silveira, GG
Subjects: CMS, Higgs, diphoton, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: A measurement of the mass of the Higgs boson in the diphoton decay channel is presented. This analysis is based on 35.9fb−1 of proton-proton collision data collected during the 2016 LHC running period, with the CMS detector at a centre-of-mass energy of 13 TeV. A refined detector calibration and new analysis techniques have been used to improve the precision of this measurement. The Higgs boson mass is measured to be mH=125.78±0.26GeV. This is combined with a measurement of mH already performed in the H→ZZ→4ℓ decay channel using the same data set, giving mH=125.46±0.16GeV. This result, when further combined with an earlier measurement of mH using data collected in 2011 and 2012 with the CMS detector, gives a value for the Higgs boson mass of mH=125.38±0.14GeV. This is currently the most precise measurement of the mass of the Higgs boson.
Published: 2020

41. Study of J/ψ meson production inside jets in pp collisions at s=8TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Magitteri, A, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Correia Silva, G, Hensel, C, and Moraes, A
Subjects: CMS, J/psi Mesons, Jets, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: A study of the production of prompt J/ψ mesons contained in jets in proton-proton collisions at s=8TeV is presented. The analysis is based on data corresponding to an integrated luminosity of 19.1 fb−1 collected with the CMS detector at the LHC. For events with at least one observed jet, the angular separation between the J/ψ meson and the jet is used to test whether the J/ψ meson is part of the jet. The analysis shows that most prompt J/ψ mesons having energy above 15 GeV and rapidity |y|
Published: 2020

42. Study of J / ψ meson production inside jets in pp collisions at s = 8 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Del Valle, A Escalante, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, C-E, Zarucki, M, Drugakov, V, Mossolov, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Velde, C Vander, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Magitteri, A, Prisciandaro, J, Saggio, A, Marono, M Vidal, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Silva, G Correia, Hensel, C, and Moraes, A
Subjects: CMS, J/psi Mesons, Jets, hep-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract: A study of the production of prompt J/ψ mesons contained in jets in proton-proton collisions at s=8TeV is presented. The analysis is based on data corresponding to an integrated luminosity of 19.1 fb−1 collected with the CMS detector at the LHC. For events with at least one observed jet, the angular separation between the J/ψ meson and the jet is used to test whether the J/ψ meson is part of the jet. The analysis shows that most prompt J/ψ mesons having energy above 15 GeV and rapidity |y|
Published: 2020

43. Production of Λc+ baryons in proton-proton and lead-lead collisions at sNN=5.02TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wittmann, J, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lauwers, J, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Luetic, J, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Khvastunov, I, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Krintiras, G, Lemaitre, V, Magitteri, A, Piotrzkowski, K, Prisciandaro, J, Saggio, A, and Vidal Marono, M
Subjects: CMS, Physics, Lambda(c) baryons, Nuclear modification factor, Heavy flavor, hep-ex, nucl-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: The transverse momentum (pT) spectra of inclusively produced Λc+ baryons are measured via the exclusive decay channel Λc+→pK−π+ using the CMS detector at the LHC. Spectra are measured as a function of transverse momentum in proton-proton (pp) and lead-lead (PbPb) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measurement is performed within the Λc+ rapidity interval |y|
Published: 2020

44. Running of the top quark mass from proton-proton collisions at s=13TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Rebello Teles, P, Belchior Batista Das Chagas, E, and Carvalho, W
Subjects: CMS, Physics, Top quark mass, QCD, Renormalization, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: The running of the top quark mass is experimentally investigated for the first time. The mass of the top quark in the modified minimal subtraction (MS‾) renormalization scheme is extracted from a comparison of the differential top quark-antiquark (tt¯) cross section as a function of the invariant mass of the tt¯ system to next-to-leading-order theoretical predictions. The differential cross section is determined at the parton level by means of a maximum-likelihood fit to distributions of final-state observables. The analysis is performed using tt¯ candidate events in the e± μ∓ channel in proton-proton collision data at a centre-of-mass energy of 13 TeV recorded by the CMS detector at the CERN LHC in 2016, corresponding to an integrated luminosity of 35.9fb−1. The extracted running is found to be compatible with the scale dependence predicted by the corresponding renormalization group equation. In this analysis, the running is probed up to a scale of the order of 1 TeV.
Published: 2020

45. Production of Λ c + baryons in proton-proton and lead-lead collisions at s NN = 5.02 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Del Valle, A Escalante, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wittmann, J, Wulz, C-E, Zarucki, M, Drugakov, V, Mossolov, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lauwers, J, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Moreels, L, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Van Parijs, I, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Luetic, J, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Wang, Q, Cornelis, T, Dobur, D, Khvastunov, I, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Krintiras, G, Lemaitre, V, Magitteri, A, Piotrzkowski, K, Prisciandaro, J, Saggio, A, and Marono, M Vidal
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, CMS, Physics, Lambda(c) baryons, Nuclear modification factor, Heavy flavor, hep-ex, nucl-ex, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The transverse momentum (pT) spectra of inclusively produced Λc+ baryons are measured via the exclusive decay channel Λc+→pK−π+ using the CMS detector at the LHC. Spectra are measured as a function of transverse momentum in proton-proton (pp) and lead-lead (PbPb) collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The measurement is performed within the Λc+ rapidity interval |y|
Published: 2020

46. Running of the top quark mass from proton-proton collisions at s = 13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Del Valle, A Escalante, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, C-E, Zarucki, M, Drugakov, V, Mossolov, V, Gonzalez, J Suarez, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Sfar, H Rejeb, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Marono, M Vidal, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Silva, G Correia, Hensel, C, Moraes, A, Teles, P Rebello, Chagas, E Belchior Batista Das, and Carvalho, W
Subjects: Nuclear and Plasma Physics, Particle and High Energy Physics, Mathematical Physics, Mathematical Sciences, Physical Sciences, CMS, Physics, Top quark mass, QCD, Renormalization, hep-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Abstract: The running of the top quark mass is experimentally investigated for the first time. The mass of the top quark in the modified minimal subtraction (MS‾) renormalization scheme is extracted from a comparison of the differential top quark-antiquark (tt¯) cross section as a function of the invariant mass of the tt¯ system to next-to-leading-order theoretical predictions. The differential cross section is determined at the parton level by means of a maximum-likelihood fit to distributions of final-state observables. The analysis is performed using tt¯ candidate events in the e± μ∓ channel in proton-proton collision data at a centre-of-mass energy of 13 TeV recorded by the CMS detector at the CERN LHC in 2016, corresponding to an integrated luminosity of 35.9fb−1. The extracted running is found to be compatible with the scale dependence predicted by the corresponding renormalization group equation. In this analysis, the running is probed up to a scale of the order of 1 TeV.
Published: 2020

47. Observation of the Λb0→J/ψΛϕ decay in proton-proton collisions at s=13TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D'Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Rebello Teles, P, Belchior Batista Das Chagas, E, Carvalho, W, Chinellato, J, Coelho, E, and Da Costa, EM
Subjects: CMS, b physics, Heavy-flavor spectroscopy, Computing, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: The observation of the Λb0→J/ψΛϕ decay is reported using proton-proton collision data collected at s=13TeV by the CMS experiment at the LHC in 2018, corresponding to an integrated luminosity of 60fb−1. The ratio of the branching fractions B(Λb0→J/ψΛϕ)/B(Λb0→ψ(2S)Λ) is measured to be (8.26±0.90(stat)±0.68(syst)±0.11(B))×10−2, where the first uncertainty is statistical, the second is systematic, and the last uncertainty reflects the uncertainties in the world-average branching fractions of ϕ and ψ(2S) decays to the reconstructed final states.
Published: 2020

48. A search for the standard model Higgs boson decaying to charm quarks

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Rebello Teles, P, Belchior Batista Das Chagas, E, Carvalho, W, Chinellato, J, and Coelho, E
Subjects: Hadron-Hadron scattering, Higgs physics, Charm physics, hep-ex, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: A direct search for the standard model Higgs boson, H, produced in association with a vector boson, V (W or Z), and decaying to a charm quark pair is presented. The search uses a data set of proton-proton collisions corresponding to an integrated luminosity of 35.9 fb−1, collected by the CMS experiment at the LHC in 2016, at a centre-of-mass energy of 13 TeV. The search is carried out in mutually exclusive channels targeting specific decays of the vector bosons: W → ℓν, Z → ℓℓ, and Z → νν, where ℓ is an electron or a muon. To fully exploit the topology of the H boson decay, two strategies are followed. In the first one, targeting lower vector boson transverse momentum, the H boson candidate is reconstructed via two resolved jets arising from the two charm quarks from the H boson decay. A second strategy identifies the case where the two charm quark jets from the H boson decay merge to form a single jet, which generally only occurs when the vector boson has higher transverse momentum. Both strategies make use of novel methods for charm jet identification, while jet substructure techniques are also exploited to suppress the background in the merged-jet topology. The two analyses are combined to yield a 95% confidence level observed (expected) upper limit on the cross section σ(VH)ℬ(H→cc¯) of 4.5 (2.4−0.7+1.0) pb, corresponding to 70 (37) times the standard model prediction. [Figure not available: see fulltext.]
Published: 2020

49. Search for new neutral Higgs bosons through the H → ZA→ ℓ+ℓ−b b ¯ process in pp collisions at √s = 13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Brandstetter, J, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Brun, H, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Trocino, D, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Zaganidis, N, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Magitteri, A, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Correia Silva, G, Hensel, C, and Moraes, A
Subjects: Beyond Standard Model, Hadron-Hadron scattering, Higgs physics, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: This paper reports on a search for an extension to the scalar sector of the standard model, where a new CP-even (odd) boson decays to a Z boson and a lighter CP-odd (even) boson, and the latter further decays to a b quark pair. The Z boson is reconstructed via its decays to electron or muon pairs. The analysed data were recorded in proton-proton collisions at a center-of-mass energy s = 13 TeV, collected by the CMS experiment at the LHC during 2016, corresponding to an integrated luminosity of 35.9 fb−1. Data and predictions from the standard model are in agreement within the uncertainties. Upper limits at 95% confidence level are set on the production cross section times branching fraction, with masses of the new bosons up to 1000 GeV. The results are interpreted in the context of the two-Higgs-doublet model. [Figure not available: see fulltext.].
Published: 2020

50. Search for physics beyond the standard model in multilepton final states in proton-proton collisions at √s = 13 TeV

Author: Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Bergauer, T, Dragicevic, M, Erö, J, Escalante Del Valle, A, Flechl, M, Frühwirth, R, Jeitler, M, Krammer, N, Krätschmer, I, Liko, D, Madlener, T, Mikulec, I, Rad, N, Schieck, J, Schöfbeck, R, Spanring, M, Spitzbart, D, Waltenberger, W, Wulz, CE, Zarucki, M, Drugakov, V, Mossolov, V, Suarez Gonzalez, J, Darwish, MR, De Wolf, EA, Di Croce, D, Janssen, X, Lelek, A, Pieters, M, Rejeb Sfar, H, Van Haevermaet, H, Van Mechelen, P, Van Putte, S, Van Remortel, N, Blekman, F, Bols, ES, Chhibra, SS, D’Hondt, J, De Clercq, J, Lontkovskyi, D, Lowette, S, Marchesini, I, Moortgat, S, Python, Q, Skovpen, K, Tavernier, S, Van Doninck, W, Van Mulders, P, Beghin, D, Bilin, B, Clerbaux, B, De Lentdecker, G, Delannoy, H, Dorney, B, Favart, L, Grebenyuk, A, Kalsi, AK, Popov, A, Postiau, N, Starling, E, Thomas, L, Vander Velde, C, Vanlaer, P, Vannerom, D, Cornelis, T, Dobur, D, Khvastunov, I, Niedziela, M, Roskas, C, Tytgat, M, Verbeke, W, Vermassen, B, Vit, M, Bondu, O, Bruno, G, Caputo, C, David, P, Delaere, C, Delcourt, M, Giammanco, A, Lemaitre, V, Prisciandaro, J, Saggio, A, Vidal Marono, M, Vischia, P, Zobec, J, Alves, FL, Alves, GA, Correia Silva, G, Hensel, C, Moraes, A, Rebello Teles, P, Belchior Batista Das Chagas, E, Carvalho, W, Chinellato, J, and Coelho, E
Subjects: Beyond Standard Model, Hadron-Hadron scattering, hep-ex, Nuclear & Particles Physics, Mathematical Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract: A search for physics beyond the standard model in events with at least three charged leptons (electrons or muons) is presented. The data sample corresponds to an integrated luminosity of 137 fb−1 of proton-proton collisions at s = 13 TeV, collected with the CMS detector at the LHC in 2016–2018. The two targeted signal processes are pair production of type-III seesaw heavy fermions and production of a light scalar or pseudoscalar boson in association with a pair of top quarks. The heavy fermions may be manifested as an excess of events with large values of leptonic transverse momenta or missing transverse momentum. The light scalars or pseudoscalars may create a localized excess in the dilepton mass spectra. The results exclude heavy fermions of the type-III seesaw model for masses below 880 GeV at 95% confidence level in the scenario of equal branching fractions to each lepton flavor. This is the most restrictive limit on the flavor-democratic scenario of the type-III seesaw model to date. Assuming a Yukawa coupling of unit strength to top quarks, branching fractions of new scalar (pseudoscalar) bosons to dielectrons or dimuons above 0.004 (0.03) and 0.04 (0.03) are excluded at 95% confidence level for masses in the range 15–75 and 108–340 GeV, respectively. These are the first limits in these channels on an extension of the standard model with scalar or pseudoscalar particles. [Figure not available: see fulltext.]
Published: 2020

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