Search for long-lived particles using out-of-time trackless jets in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV
A. TumasyanYerevan Physics Institute, Yerevan, ArmeniaW. AdamInstitut für Hochenergiephysik, Vienna, AustriaJanik Walter AndrejkovicInstitut für Hochenergiephysik, Vienna, AustriaT. BergauerInstitut für Hochenergiephysik, Vienna, AustriaS. ChatterjeeInstitut für Hochenergiephysik, Vienna, AustriaK. DamanakisInstitut für Hochenergiephysik, Vienna, AustriaM. DragicevicInstitut für Hochenergiephysik, Vienna, AustriaA. Escalante Del ValleInstitut für Hochenergiephysik, Vienna, AustriaPriya Sajid HussainInstitut für Hochenergiephysik, Vienna, AustriaM. JeitlerInstitut für Hochenergiephysik, Vienna, AustriaNatascha KrammerInstitut für Hochenergiephysik, Vienna, AustriaL. LechnerInstitut für Hochenergiephysik, Vienna, AustriaD. LikoInstitut für Hochenergiephysik, Vienna, AustriaI. MikulecInstitut für Hochenergiephysik, Vienna, AustriaP. PaulitschInstitut für Hochenergiephysik, Vienna, AustriaJ. SchieckInstitut für Hochenergiephysik, Vienna, AustriaR. SchöfbeckInstitut für Hochenergiephysik, Vienna, AustriaD. SchwarzInstitut für Hochenergiephysik, Vienna, AustriaM. SonawaneInstitut für Hochenergiephysik, Vienna, AustriaS. TemplInstitut für Hochenergiephysik, Vienna, AustriaW. WaltenbergerInstitut für Hochenergiephysik, Vienna, AustriaC.-E. WulzInstitut für Hochenergiephysik, Vienna, AustriaM. R. DarwishUniversiteit Antwerpen, Antwerpen, BelgiumX. JanssenUniversiteit Antwerpen, Antwerpen, BelgiumT. KelloUniversiteit Antwerpen, Antwerpen, BelgiumHaifa Rejeb SfarUniversiteit Antwerpen, Antwerpen, BelgiumP. Van MechelenUniversiteit Antwerpen, Antwerpen, BelgiumE. S. BolsVrije Universiteit Brussel, Brussel, BelgiumJ. D’HondtVrije Universiteit Brussel, Brussel, BelgiumA. De MoorVrije Universiteit Brussel, Brussel, BelgiumM. DelcourtVrije Universiteit Brussel, Brussel, BelgiumH. El FahamVrije Universiteit Brussel, Brussel, BelgiumS. LowetteVrije Universiteit Brussel, Brussel, BelgiumA. MortonVrije Universiteit Brussel, Brussel, BelgiumD. MüllerVrije Universiteit Brussel, Brussel, BelgiumA. R. SahasransuVrije Universiteit Brussel, Brussel, BelgiumS. TavernierVrije Universiteit Brussel, Brussel, BelgiumW. Van DoninckVrije Universiteit Brussel, Brussel, BelgiumS. Van PutteVrije Universiteit Brussel, Brussel, BelgiumD. VanneromVrije Universiteit Brussel, Brussel, BelgiumB. ClerbauxUniversité Libre de Bruxelles, Bruxelles, BelgiumG. De LentdeckerUniversité Libre de Bruxelles, Bruxelles, BelgiumL. FavartUniversité Libre de Bruxelles, Bruxelles, BelgiumD. HohovUniversité Libre de Bruxelles, Bruxelles, BelgiumJ. JaramilloUniversité Libre de Bruxelles, Bruxelles, BelgiumK. LeeUniversité Libre de Bruxelles, Bruxelles, BelgiumM. MahdavikhorramiUniversité Libre de Bruxelles, Bruxelles, BelgiumI. MakarenkoUniversité Libre de Bruxelles, Bruxelles, BelgiumA. MalaraUniversité Libre de Bruxelles, Bruxelles, BelgiumS. ParedesUniversité Libre de Bruxelles, Bruxelles, BelgiumL. PétréUniversité Libre de Bruxelles, Bruxelles, BelgiumN. PostiauUniversité Libre de Bruxelles, Bruxelles, BelgiumL. ThomasUniversité Libre de Bruxelles, Bruxelles, BelgiumM. Vanden BemdenUniversité Libre de Bruxelles, Bruxelles, BelgiumC. Vander VeldeUniversité Libre de Bruxelles, Bruxelles, BelgiumP. VanlaerUniversité Libre de Bruxelles, Bruxelles, BelgiumD. DoburGhent University, Ghent, BelgiumJ. KnolleGhent University, Ghent, BelgiumLuka LambrechtGhent University, Ghent, BelgiumGianny MestdachGhent University, Ghent, BelgiumCésar RendónGhent University, Ghent, BelgiumAmrutha SamalanGhent University, Ghent, BelgiumK. SkovpenGhent University, Ghent, BelgiumM. TytgatGhent University, Ghent, BelgiumN. Van Den BosscheGhent University, Ghent, BelgiumB. VermassenGhent University, Ghent, BelgiumLiam WezenbeekGhent University, Ghent, BelgiumA. BeneckeUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumG. BrunoUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumF. BuryUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumC. CaputoUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumP. DavidUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumC. DelaereUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumI. S. DonertasUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumA. GiammancoUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumK. JaffelUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumSa. JainUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumV. Lemaı̂treUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumK. MondalUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumA. TaliercioUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumT. T. TranUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumP. VischiaUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumS. WertzUniversité Catholique de Louvain, Louvain-la-Neuve, BelgiumG. A. AlvesCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, BrazilE. CoelhoCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, BrazilC. HenselCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, BrazilA. MoraesCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, BrazilP. Rebello TelesCentro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, BrazilW. L. Aldá JúniorUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilM. Alves Gallo PereiraUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilM. Barroso Ferreira FilhoUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilH. MalbouissonUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilW. CarvalhoUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilJ. ChinellatoUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilE. M. Da CostaUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilG. G. Da SilveiraUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilD. De Jesus DamiãoUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilV. Dos Santos SousaUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilS. Fonseca De SouzaUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilJ. MartinsUniversidade do Estado do Rio de Janeiro, Rio de Janeiro, Brazil
ABI
Abstract
A bstract A search for long-lived particles decaying in the outer regions of the CMS silicon tracker or in the calorimeters is presented. The search is based on a data sample of proton-proton collisions at $$ \sqrt{s} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 TeV recorded with the CMS detector at the LHC in 2016–2018, corresponding to an integrated luminosity of 138 fb − 1 . A novel technique, using nearly trackless and out-of-time jet information combined in a deep neural network discriminator, is employed to identify decays of long-lived particles. The results are interpreted in a simplified model of chargino-neutralino production, where the neutralino is the next-to-lightest supersymmetric particle, is long-lived, and decays to a gravitino and either a Higgs or Z boson. This search is most sensitive to neutralino proper decay lengths of approximately 0.5 m, for which masses up to 1.18 TeV are excluded at 95% confidence level. The current search is the best result to date in the mass range from the kinematic limit imposed by the Higgs boson mass up to 1.8 TeV.
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