000580449 001__ 580449
000580449 005__ 20240614213342.0
000580449 0247_ $$2datacite_doi$$a10.3204/PUBDB-2023-01292
000580449 037__ $$aPUBDB-2023-01292
000580449 041__ $$aEnglish
000580449 088__ $$2DESY$$aDESY-THESIS-2023-005
000580449 1001_ $$0P:(DE-H253)PIP1081081$$aFilatov, Oleg$$b0$$eCorresponding author$$gmale$$udesy
000580449 245__ $$aTau identification algorithms and study of the CP structure of the Yukawa coupling between the Higgs boson and tau leptons in CMS$$f2019-09-01 - 2023-01-19
000580449 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron DESY$$c2023
000580449 300__ $$a191
000580449 3367_ $$2DataCite$$aOutput Types/Dissertation
000580449 3367_ $$0PUB:(DE-HGF)3$$2PUB:(DE-HGF)$$aBook$$mbook
000580449 3367_ $$2ORCID$$aDISSERTATION
000580449 3367_ $$2BibTeX$$aPHDTHESIS
000580449 3367_ $$02$$2EndNote$$aThesis
000580449 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1718350166_2981009
000580449 3367_ $$2DRIVER$$adoctoralThesis
000580449 4900_ $$aDESY-THESIS
000580449 502__ $$aDissertation, Universität Hamburg, 2023$$bDissertation$$cUniversität Hamburg$$d2023$$o2023-01-19
000580449 520__ $$aThe measurement of the CP properties of the Yukawa coupling of the Higgs boson to τleptons is presented. The data set used for the analysis is collected by the CMS experiment atthe LHC during the Run 2 data-taking period in proton-proton collisions at √s = 13 TeV andcorresponds to an integrated luminosity of 137 fb$^{−1}$. The Yukawa coupling between the Higgsboson and $τ$ leptons is parametrised in terms of the effective mixing angle α$^{Hττ}$, where the valueα$^{Hττ}$ = 0◦(90◦) corresponds to the SM scenario of the pure CP-even (CP-odd) H$ττ$ coupling.The angle between the decay planes of the $τ$ leptons is used as the observable encoding the CP nature of the Higgs boson. The measurement is performed in the $τ$$_e$$τ$$_h$ channel where oneτ lepton decays into an electron and the other hadronically. The results are combined with themeasurement in the $τ$$_q$$τ$$_h$ and $τ$$_h$$τ$$_h$ channels. The observed (expected) value of the effectivemixing angle for the combination is measured to be: α$^{Hττ}$ = −1 ± 19◦(0 ± 21◦) @68.3% CL.The results are compatible with the SM expectation and the pure CP-odd hypothesis isrejected at the observed (expected) significance level of 3.0 (2.6) standard deviations.The improvements to the $τ$ lepton identification in CMS in the context of the Run 3 preparationare described. Retraining and optimisation of the DeepTau algorithm with the addition ofthe adversarial fine-tuning procedure are performed. The resulting model improves upon theprevious DeepTau model in terms of the background rejection by 10-50% and has a betterdescription of data with simulation in the H → $ττ$ selection region.A new algorithm called Tau Transformer (TaT) is proposed to overcome the limitations of theDeepTau architecture. The TaT core is based on self-attention layers and features the embeddingmodule allowing for the multimodality treatment of the input representation. Comparison of theTaT model with the retrained DeepTau model and a comparable ParticleNet-based architectureshows consistently improved performance by up to 50% in the misidentification rate across the $p\tiny{T}$, $η$, and decay mode ranges of interest.
000580449 536__ $$0G:(DE-HGF)POF4-611$$a611 - Fundamental Particles and Forces (POF4-611)$$cPOF4-611$$fPOF IV$$x0
000580449 536__ $$0G:(DE-HGF)2015_IFV-VH-GS-500$$aPHGS, VH-GS-500 - PIER Helmholtz Graduate School (2015_IFV-VH-GS-500)$$c2015_IFV-VH-GS-500$$x1
000580449 693__ $$0EXP:(DE-H253)LHC-Exp-CMS-20150101$$1EXP:(DE-588)4398783-7$$5EXP:(DE-H253)LHC-Exp-CMS-20150101$$aLHC$$eLHC: CMS$$x0
000580449 7001_ $$0P:(DE-H253)PIP1007577$$aRaspiareza, Alexei$$b1$$eThesis advisor$$udesy
000580449 7001_ $$0P:(DE-H253)PIP1024633$$aGallo-Voss, Elisabetta$$b2$$eThesis advisor
000580449 8564_ $$uhttps://bib-pubdb1.desy.de/record/580449/files/Filatov_CP_HTT_TaT_final.pdf$$yOpenAccess
000580449 8564_ $$uhttps://bib-pubdb1.desy.de/record/580449/files/desy-thesis-23-005.title.pdf$$yOpenAccess
000580449 8564_ $$uhttps://bib-pubdb1.desy.de/record/580449/files/Filatov_CP_HTT_TaT_final.pdf?subformat=pdfa$$xpdfa$$yOpenAccess
000580449 8564_ $$uhttps://bib-pubdb1.desy.de/record/580449/files/desy-thesis-23-005.title.pdf?subformat=pdfa$$xpdfa$$yOpenAccess
000580449 909CO $$ooai:bib-pubdb1.desy.de:580449$$popenaire$$popen_access$$pdnbdelivery$$pdriver$$pVDB
000580449 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1081081$$aDeutsches Elektronen-Synchrotron$$b0$$kDESY
000580449 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1007577$$aDeutsches Elektronen-Synchrotron$$b1$$kDESY
000580449 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1024633$$aDeutsches Elektronen-Synchrotron$$b2$$kDESY
000580449 9131_ $$0G:(DE-HGF)POF4-611$$1G:(DE-HGF)POF4-610$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMatter and the Universe$$vFundamental Particles and Forces$$x0
000580449 9141_ $$y2023
000580449 915__ $$0StatID:(DE-HGF)0510$$2StatID$$aOpenAccess
000580449 920__ $$lyes
000580449 9201_ $$0I:(DE-H253)CMS-20120731$$kCMS$$lLHC/CMS Experiment$$x0
000580449 980__ $$aphd
000580449 980__ $$aVDB
000580449 980__ $$abook
000580449 980__ $$aI:(DE-H253)CMS-20120731
000580449 980__ $$aUNRESTRICTED
000580449 9801_ $$aFullTexts