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Abstract:

A search for new phenomena in final states containing an e + e - or μ + μ - pair, jets, and large missing transverse momentum is presented. This analysis makes use of proton–proton collision data with an integrated luminosity of 36.1fb-1, collected during 2015 and 2016 at a centre-of-mass energy s=13TeV with the ATLAS detector at the Large Hadron Collider. The search targets the pair production of supersymmetric coloured particles (squarks or gluinos) and their decays into final states containing an e + e - or μ + μ - pair and the lightest neutralino (χ~10) via one of two next-to-lightest neutralino (χ~20) decay mechanisms: χ~20→Zχ~10, where the Z boson decays leptonically leading to a peak in the dilepton invariant mass distribution around the Z boson mass; and χ~20→ℓ+ℓ-χ~10 with no intermediate ℓ + ℓ - resonance, yielding a kinematic endpoint in the dilepton invariant mass spectrum. The data are found to be consistent with the Standard Model expectation. Results are interpreted using simplified models, and exclude gluinos and squarks with masses as large as 1.85 and 1.3 Te at 95% confidence level, respectively. © 2018, CERN for the benefit of the ATLAS collaboration.

Registro:

Documento: Artículo
Título:Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector
Autor:Aaboud, M. et al.
Este artículo contiene 2905 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 2905 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Año:2018
Volumen:78
Número:8
DOI: http://dx.doi.org/10.1140/epjc/s10052-018-6081-9
Título revista:European Physical Journal C
Título revista abreviado:Eur. Phys. J. C
ISSN:14346044
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_14346044_v78_n8_p_Aaboud

Referencias:

  • Golfand, Y.A., Likhtman, E.P., Extension of the Algebra of Poincare Group Generators and Violation of p Invariance (1971) JETP Lett., 13, p. 323. , [Pisma Zh. Eksp. Teor. Fiz. 13 (1971) 452]
  • Volkov, D.V., Akulov, V.P., Is the neutrino a goldstone particle? (1973) Phys. Lett. B, 46, p. 109
  • Wess, J., Zumino, B., Supergauge transformations in four-dimensions (1974) Nucl. Phys. B, 70, p. 39
  • Wess, J., Zumino, B., Supergauge invariant extension of quantum electrodynamics (1974) Nucl. Phys. B, 78, p. 1
  • Ferrara, S., Zumino, B., Supergauge invariant Yang–Mills theories (1974) Nucl. Phys. B, 79, p. 413
  • Salam, A., Strathdee, J.A., Supersymmetry and nonabelian gauges (1974) Phys. Lett. B, 51, p. 353
  • Farrar, G.R., Fayet, P., Phenomenology of the production, decay, and detection of new hadronic states associated with supersymmetry (1978) Phys. Lett. B, 76, p. 575
  • Goldberg, H., Constraint on the photino mass from cosmology (1983) Phys. Rev. Lett., 50, p. 1419. , [Erratum: Phys. Rev. Lett. 103, 099905 (2009)]
  • Ellis, J.R., Hagelin, J.S., Nanopoulos, D.V., Olive, K.A., Srednicki, M., Supersymmetric relics from the big bang (1984) Nucl. Phys. B, 238, p. 453
  • Sakai, N., Naturalness in supersymmetric GUTS (1981) Z. Phys. C, 11, p. 153
  • Dimopoulos, S., Raby, S., Wilczek, F., Supersymmetry and the scale of unification (1981) Phys. Rev. D, 24, p. 1681
  • Ibanez, L.E., Ross, G.G., Low-energy predictions in supersymmetric grand unified theories (1981) Phys. Lett. B, 105, p. 439
  • Dimopoulos, S., Georgi, H., Softly broken supersymmetry and SU(5) (1981) Nucl. Phys. B, 193, p. 150
  • Search for new phenomena in final states with two opposite-charge, same-flavor leptons, jets, and missing transverse momentum in pp collisions at √s = 13 TeV (2018) JHEP, 3. , [hep-ex]
  • Search for new phenomena in events containing a same-flavour opposite-sign dilepton pair, jets, and large missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector (2017) Eur. Phys. J. C, 77, p. 144. , hep-ex
  • The ATLAS experiment at the CERN large hadron collider (2008) JINST, 3
  • Atlas Insertable B-layer Technical Design Report (2010) ATLAS-TDR-19, , https://cds.cern.ch/record/1291633, ATLAS Insertable B-Layer Technical Design Report Addendum, ATLAS-TDR-19-ADD-1
  • Performance of the ATLAS trigger system in 2015 (2017) Eur. Phys. J. C, 77, p. 317
  • Alves, D., Izaguirre, E., Wacker, J., Where the sidewalk ends: jets and missing energy search strategies for the 7TeV LHC (2011) JHEP, 10, p. 012. , [hep-ph]
  • Dine, M., Fischler, W., A phenomenological model of particle physics based on supersymmetry (1982) Phys. Lett. B, 110, p. 227
  • Alvarez-Gaume, L., Claudson, M., Wise, M.B., Low-energy supersymmetry (1982) Nucl. Phys. B, 207, p. 96
  • Nappi, C.R., Ovrut, B.A., Supersymmetric extension of the SU(3) × SU(2) × U(1) model (1982) Phys. Lett. B, 113, p. 175
  • Berger, C.F., Gainer, J.S., Hewett, J.L., Rizzo, T.G., Supersymmetry without prejudice (2009) JHEP, 2, p. 023. , [hep-ph]
  • Djouadi, A., (1998) The minimal supersymmetric standard model: Group summary report, , GDR (Groupement De Recherche), Supersymetrie Montpellier
  • Luminosity determination in pp collisions at √s = 8 TeV using the ATLAS detector at the LHC (2016) Eur. Phys. J. C, 76, p. 653
  • Ball, R.D., Parton distributions with LHC data (2013) Nucl. Phys. B, 867, p. 244. , [hep-ph]
  • Alwall, J., The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations (2014) JHEP, 7, p. 079. , [hep-ph]
  • Sjöstrand, T., Mrenna, S., Skands, P., A brief introduction to PYTHIA 8.1 (2008) Comput. Phys. Commun., 178, p. 852. , [hep-ph]
  • (2014) ATLAS Pythia 8 tunes to 7 TeV data, , http://cdsweb.cern.ch/record/1966419, ATL-PHYS-PUB-2014-021
  • Nason, P., A new method for combining NLO QCD with shower Monte Carlo algorithms (2004) JHEP, 11, p. 040
  • Frixione, S., Nason, P., Oleari, C., Matching NLO QCD computations with parton shower simulations: the POWHEG method (2007) JHEP, 11, p. 070. , [hep-ph]
  • Alioli, S., Nason, P., Oleari, C., Re, E., A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX (2010) JHEP, 6, p. 043. , [hep-ph]
  • Sjöstrand, T., Mrenna, S., Skands, P., PYTHIA 6.4 physics and manual (2006) JHEP, 5, p. 026
  • Lai, H.-L., New parton distributions for collider physics (2010) Phys. Rev. D, 82, p. 074024. , [hep-ph]
  • Skands, P.Z., Tuning Monte Carlo generators: the Perugia tunes (2010) Phys. Rev. D, 82, p. 074018. , [hep-ph]
  • Lange, D.J., The EvtGen particle decay simulation package (2001) Nucl. Instrum. Methods A, 462, p. 152
  • Gleisberg, T., Höche, S., Comix, a new matrix element generator (2008) JHEP, 12, p. 039. , [hep-ph]
  • Cascioli, F., Maierhofer, P., Pozzorini, S., Scattering amplitudes with open loops (2012) Phys. Rev. Lett., 108, p. 111601. , [hep-ph]
  • Schumann, S., Krauss, F., A Parton shower algorithm based on Catani–Seymour dipole factorisation (2008) JHEP, 3, p. 038. , [hep-ph]
  • Höche, S., Krauss, F., Schönherr, M., Siegert, F., QCD matrix elements + parton showers: the NLO case (2013) JHEP, 4, p. 027. , [hep-ph]
  • Ball, R.D., Parton distributions for the LHC Run II (2015) JHEP, 4, p. 040. , [hep-ph]
  • Catani, S., Krauss, F., Kuhn, R., Webber, B., Qcd matrix elements + parton showers (2001) JHEP, 11, p. 063
  • Lönnblad, L., Correcting the colour-dipole cascade model with fixed order matrix elements (2002) JHEP, 5, p. 046
  • Beenakker, W., Höpker, R., Spira, M., Zerwas, P., Squark and gluino production at hadron colliders (1997) Nucl. Phys. B, 492, p. 51
  • Kulesza, A., Motyka, L., Threshold resummation for squark–antisquark and gluino-pair production at the LHC (2009) Phys. Rev. Lett., 102, p. 111802. , [hep-ph]
  • Kulesza, A., Motyka, L., Soft gluon resummation for the production of gluino–gluino and squark–antisquark pairs at the LHC (2009) Phys. Rev. D, 80, p. 095004. , [hep-ph]
  • Beenakker, W., Soft-gluon resummation for squark and gluino hadroproduction (2009) JHEP, 12, p. 041. , [hep-ph]
  • Beenakker, W., Squark and gluino hadroproduction (2011) Int. J. Mod. Phys. A, 26, p. 2637. , [hep-ph]
  • The ATLAS simulation infrastructure (2010) Eur. Phys. J. C, 70, p. 823. , [physics.ins-det]
  • Agostinelli, S., GEANT4—a simulation toolkit (2003) Nucl. Instrum. Methods A, 506, p. 250
  • Summary of ATLAS Pythia 8 tunes (2012) ATL-PHYS-PUB-2012-003, , http://cds.cern.ch/record/1474107
  • Martin, A.D., Stirling, W.J., Thorne, R.S., Watt, G., Parton distributions for the LHC (2009) Eur. Phys. J. C, 63, p. 189. , [hep-ph]
  • (2016) Modelling of the t t ¯ H and t t ¯ V (V = W, Z) processes for √s = 13 TeV ATLAS analyses, , http://cds.cern.ch/record/2120826, ATL-PHYS-PUB-2016-005
  • Garzelli, M.V., Kardos, A., Papadopoulos, C.G., Trocsanyi, Z., tt¯ W + - and tt¯ Z hadroproduction at NLO accuracy in QCD with parton shower and hadronization effects (2012) JHEP, 11, p. 056. , [hep-ph]
  • Campbell, J.M., Ellis, R.K., tt¯ W production and decay at NLO (2012) JHEP, 7, p. 052. , [hep-ph]
  • Lazopoulos, A., McElmurry, T., Melnikov, K., Petriello, F., Next-to-leading order QCD corrections to tt¯ Z production at the LHC (2008) Phys. Lett. B, 666, p. 62. , [hep-ph]
  • Simulation of top quark production for the ATLAS experiment at √s = 13 TeV (2016) ATL-PHYS-PUB-2016-004, , http://cds.cern.ch/record/2120417
  • Czakon, M., Fiedler, P., Mitov, A., Total top-quark pair-production cross section at hadron colliders through O(α_s 4 ) (2013) Phys. Rev. Lett., 110, p. 252004. , [hep-ph]
  • Czakon, M., Mitov, A., Top++: a program for the calculation of the top-pair cross-section at hadron colliders (2014) Comput. Phys. Commun., 185, p. 2930. , [hep-ph]
  • Kidonakis, N., Two-loop soft anomalous dimensions for single top quark associated production with a W - or H - (2010) Phys. Rev. D, 82, p. 054018. , [hep-ph]
  • Multi-boson simulation for 13 TeV ATLAS analyses (2016) ATL-PHYS-PUB-2016-002, , http://cds.cern.ch/record/2119986
  • Campbell, J.M., Ellis, R.K., Update on vector boson pair production at hadron colliders (1999) Phys. Rev. D, 60, p. 113006. , [hep-ph]
  • Campbell, J.M., Ellis, R.K., Williams, C., Vector boson pair production at the LHC (2011) JHEP, 7, p. 018. , [hep-ph]
  • (2016) Monte Carlo Generators for the Production of a W or Z / γ ∗ Boson in Association with Jets at ATLAS in Run 2, , http://cds.cern.ch/record/2120133, ATL-PHYS-PUB-2016-003
  • Catani, S., Cieri, L., Ferrera, G., de Florian, D., Grazzini, M., Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO (2009) Phys. Rev. Lett., 103, p. 082001. , [hep-ph]
  • Catani, S., Grazzini, M., An NNLO subtraction formalism in hadron collisions and its application to Higgs boson production at the LHC (2007) Phys. Rev. Lett., 98, p. 222002. , [hep-ph]
  • Gleisberg, T., Event generation with sherpa 1.1 (2009) JHEP, 2, p. 007. , [hep-ph]
  • Electron efficiency measurements with the ATLAS detector using the 2015 LHC proton–proton collision data (2016) ATLAS-CONF-2016-024, , https://cds.cern.ch/record/2157687
  • Vertex reconstruction performance of the ATLAS detector at √s = 13 TeV (2015) ATL-PHYS-PUB-2015, p. 026. , http://cds.cern.ch/record/2037717
  • Muon reconstruction performance of the ATLAS detector in proton–proton collision data at √s = 13 TeV (2016) Eur. Phys. J. C, 76, p. 292. , [hep-ex]
  • Topological cell clustering in the ATLAS calorimeters and its performance in LHC Run 1 (2017) Eur. Phys. J. C, 77, p. 490. , hep-ex
  • Cacciari, M., Salam, G.P., Soyez, G., The anti- k t jet clustering algorithm (2008) JHEP, 4, p. 063. , [hep-ph]
  • Cacciari, M., Salam, G.P., Dispelling the N3 myth for the k t jet-finder (2006) Phys. Lett. B, 641, p. 57
  • Cacciari, M., Salam, G.P., Soyez, G., Fastjet, a Software Package for Jet Finding in Pp and E+E - Collisions, , http://fastjet.fr/
  • (2017) Jet energy scale measurements and their systematic uncertainties in proton–proton collisions at √s = 13 TeV with the ATLAS detecto
  • (2015) Jet calibration and systematic uncertainties for jets reconstructed in the ATLAS detector at √s = 13 TeV, , http://cds.cern.ch/record/2037613, ATL-PHYS-PUB-2015-015
  • (2014) Tagging and suppression of pileup jets with the atlas detector, , http://cds.cern.ch/record/1700870, ATLAS-CONF-2014-018
  • Characterisation and mitigation of beam-induced backgrounds observed in the ATLAS detector during the 2011 proton-proton run (2013) JINST, 8. , [hep-ex]
  • (2015) Selection of jets produced in 13 TeV proton-proton collisions with the ATLAS detector, , http://cds.cern.ch/record/2037702, ATLAS-CONF-2015-029
  • Performance of b -jet identification in the ATLAS experiment (2016) JINST, 11
  • (2016) Optimisation of the ATLAS b-tagging performance for the 2016 LHC Run, , http://cds.cern.ch/record/2160731, ATL-PHYS-PUB-2016-012
  • Measurement of the photon identification efficiencies with the ATLAS detector using LHC Run-1 data (2016) Eur. Phys. J. C, 76, p. 666. , [hep-ex]
  • (2018) Performance of Missing Transverse Momentum Reconstruction with the ATLAS Detector Using Proton-Proton Collisions at √s = 13 Tev, , hep-ex
  • Lester, C.G., Summers, D.J., Measuring masses of semiinvisibly decaying particles pair produced at hadron colliders (1999) Phys. Lett. B, 463, p. 99. , [hep-ph]
  • Barr, A., Lester, C., Stephens, P., m(T2): the truth behind the glamour (2003) J. Phys. G, 29, p. 2343. , [hep-ph]
  • Cowan, G., Cranmer, K., Gross, E., Vitells, O., Asymptotic formulae for likelihood-based tests of new physics (2011) Eur. Phys. J. C, 71, p. 1554. , Erratum: Eur. Phys. J. C 73, 2501 (2013), physics.data-an
  • Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at √s = 8 TeV with the ATLAS detector (2015) JHEP, 4, p. 116. , [hep-ex]
  • Jet energy scale measurements and their systematic uncertainties in proton-proton collisions at √s = 13 TeV with the ATLAS detector (2017) Phys. Rev. D, 96
  • Bähr, M., Herwig++ Physics and Manual (2008) Eur. Phys. J. C, 58, p. 639. , [hep-ph]
  • Bellm, J., Herwig 7.0/Herwig++ 3.0 release note (2016) Eur. Phys. J. C, 76, p. 196. , [hep-ph]
  • Re, E., Single-top Wt-channel production matched with parton showers using the POWHEG method (2011) Eur. Phys. J. C, 71, p. 1547. , [hep-ph]
  • Measurement of W ± and Z -boson production cross sections in pp collisions at √s = 13 TeV with the ATLAS detector (2016) Phys. Lett. B, 759, p. 601. , [hep-ex]
  • Multi-Boson Simulation for 13 Tev ATLAS Analyses, , https://cds.cern.ch/record/2261933, ATL-PHYS-PUB-2017-005
  • Hoeche, S., Schumann, S., Siegert, F., Hard photon production and matrix-element parton-shower merging (2010) Phys. Rev. D, 81, p. 034026. , [hep-ph]
  • Borschensky, C., Squark and gluino production cross sections in pp collisions at s=13, 14, 33 and 100 TeV (2014) Eur. Phys. J. C, 74, p. 3174. , [hep-ph]
  • Read, A., Presentation of search results: the CLs technique (2002) J. Phys. G, 28, p. 2693
  • Baak, M., HistFitter software framework for statistical data analysis (2014) Eur. Phys. J. C, 75, p. 153. , [hep-ex]
  • ATLAS Computing Acknowledgements 2016–2017, , https://cds.cern.ch/record/2202407, ATL-GEN-PUB-2016-002

Citas:

---------- APA ----------
(2018) . Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector. European Physical Journal C, 78(8).
http://dx.doi.org/10.1140/epjc/s10052-018-6081-9
---------- CHICAGO ----------
Aaboud, M. "Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector" . European Physical Journal C 78, no. 8 (2018).
http://dx.doi.org/10.1140/epjc/s10052-018-6081-9
---------- MLA ----------
Aaboud, M. "Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector" . European Physical Journal C, vol. 78, no. 8, 2018.
http://dx.doi.org/10.1140/epjc/s10052-018-6081-9
---------- VANCOUVER ----------
Aaboud, M. Search for new phenomena using the invariant mass distribution of same-flavour opposite-sign dilepton pairs in events with missing transverse momentum in √s=13 TeV pp collisions with the ATLAS detector. Eur. Phys. J. C. 2018;78(8).
http://dx.doi.org/10.1140/epjc/s10052-018-6081-9