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Report of Contributions EPS-HEP2019 Report of Contributions https://indico.cern.ch/e/EPS-HEP2019 EPS-HEP2019 / Report of Contributions A Composite 2-Higgs Doublet Model Contribution ID: 4 Type: Parallel talk A Composite 2-Higgs Doublet Model Friday, 12 July 2019 14:30 (15 minutes) We consider a Composite Higgs Model with two isospin doublet Higgs fields arising as pseudo Nambu-Goldstone bosons from a SO(6)->SO(4)xSO(2) breaking. The main focus is to explicitly compute the properties of these Higgses in terms of the fundamental parameters of the composite sector such as masses, Yukawa and gauge couplings of the new spin-1 and spin-1/2 resonances. Concretely, we calculate the Higgs potential at one-loop level through the Coleman-Weinberg mechanism from the explicit breaking of the SO(6) global symmetry by the partial compositeness of fermions and gauge bosons. We derive then the phenomenological properties of the Higgs states and highlight the main signatures of this Composite 2-Higgs Doublet Model at the Large Hadron Collider, including modifications to the SM-like Higgs couplings as well as production anddecay channels of heavier Higgs bosons. Primary authors: DELLE ROSE, Luigi (University of Florence); DE CURTIS, Stefania (Universita e INFN, Firenze (IT)); MORETTI, Stefano (Science and Technology Facilities Council STFC (GB)); YAGYU, Kei (Seikei University) Presenter: DELLE ROSE, Luigi (University of Florence) Session Classification: Higgs Physics Track Classification: Higgs Physics October 4, 2021 Page 1 EPS-HEP2019 / Report of Contributions Directional Dark Matter Search wi … Contribution ID: 5 Type: Parallel talk Directional Dark Matter Search with Nuclear Emulsion Thursday, 11 July 2019 17:35 (20 minutes) The NEWSdm experiment, based on nuclear emulsions, is proposed to measure the direction of WIMP-induced nuclear recoils. We discuss the potentiality, both in terms of exclusion limits and potential discovery, of a directional experiment based on the use of a solid target made by newly developed nuclear emulsions and read-out systems reaching sub-micrometric resolution. We also report results of the test exposure conducted in Gran Sasso last year. Primary authors: GULER, Murat Ali (Middle East Technical University (TR)); NEWSDM COLLAB- ORATION Presenter: GALATI, Giuliana Session Classification: Dark Matter Track Classification: Dark Matter October 4, 2021 Page 2 EPS-HEP2019 / Report of Contributions Singlet-doublet fermion and triplet … Contribution ID: 6 Type: Parallel talk Singlet-doublet fermion and triplet scalar dark matter with radiative neutrino masses Thursday, 11 July 2019 10:45 (25 minutes) We present a detailed study of a combined singlet-doublet fermion and triplet scalar model for dark matter. These models have only been studied separately in the past. Together, theyforma simple extension of the Standard Model that can account for dark matter and explain the existence of neutrino masses, which are generated radiatively. However, this also implies the existence of lepton flavour violating processes. In addition, this particular model allows for gauge coupling unification. The new fields are odd under a new Z2 symmetry to stabilise the dark matter candidate. We analyse the dark matter, neutrino mass and lepton flavour violation aspects both separately and in conjunction, exploring the viable parameter space of the model. This is done using a numerical random scan imposing successively the neutrino mass and mixing, relic density, Higgs mass, direct detection, collider and lepton flavour violation constraints. We find that dark matter in thismodel is fermionic for masses below about 1 TeV and scalar above. The narrow mass regions found previously for the two separate models are enlarged by their coupling. While coannihilations of the weak isospin partners are sizeable, this is not the case for fermions and scalars despite their often similar masses due to the relatively small coupling of the two sectors, imposed bythesmall neutrino masses. We observe a high degree of complementarity between direct detection and lepton flavour violation experiments, which should soon allow to fully probe the fermionic dark matter sector and at least partially the scalar dark matter sector. Primary authors: FIASCHI, Juri (Westfälische Wilhelms-Universität Münster); KLASEN, Michael; MAY, Simon (WWU Münster) Presenter: KLASEN, Michael Session Classification: Dark Matter Track Classification: Dark Matter October 4, 2021 Page 3 EPS-HEP2019 / Report of Contributions Inclusive dijet photoproduction in … Contribution ID: 7 Type: Parallel talk Inclusive dijet photoproduction in ultraperipheral heavy-ion collisions at the LHC in next-to-leading order QCD Saturday, 13 July 2019 09:36 (18 minutes) We present a calculation of the cross section of inclusive dijet photoproduction in ultraperipheral Pb-Pb collisions at the LHC using next-to-leading order perturbative QCD. We demonstrate that our theoretical calculations provide a good description of various kinematic distributions measured by the ATLAS collaboration. We find that the calculated dijet photoproduction cross section is sensitive to nuclear modifications of parton distribution functions (PDFs) at the level of 10to20%. Hence, this process can be used to reduce uncertainties in the determination of these nuclear PDFs, whose current magnitude is comparable to the size of the calculated nuclear modifications of the dijet photoproduction cross section. Primary authors: KLASEN, Michael; GUZEY, Vadim Presenter: KLASEN, Michael Session Classification: Heavy Ion Physics Track Classification: Heavy Ion Physics October 4, 2021 Page 4 EPS-HEP2019 / Report of Contributions Pair production of electroweak su … Contribution ID: 8 Type: Parallel talk Pair production of electroweak superpartners at the LHC in NLO+NLL with resummation-improved parton densities Thursday, 11 July 2019 09:30 (15 minutes) We make use of recently released parton density functions (PDFs) with threshold-resummation improvement to consistently calculate theoretical predictions for neutralino-chargino and slep- ton pair production at next-to-leading order and next-to-leading logarithmic accuracy. The up- dated cross sections have been computed for experimentally relevant higgsino/gaugino and slep- ton search channels at the ongoing Run II of the LHC. A factorisation method is applied to exploit the smaller PDF uncertainty of the global PDF sets and to avoid complications arising in the refit- ting of threshold-resummation improved PDF replicas in Mellin space. The reduction of the scale uncertainty due to the resummation is, however, explicitly taken into account. As expected, the resummation contributions in the PDF fits partially compensate the cross section enhancements induced by those in the partonic matrix elements. Primary authors: FIASCHI, Juri (Westfälische Wilhelms-Universität Münster); KLASEN, Michael Presenter: KLASEN, Michael Session Classification: Searches for New Physics Track Classification: Searches for New Physics October 4, 2021 Page 5 EPS-HEP2019 / Report of Contributions Exclusion Limits on Neutral, Mono … Contribution ID: 10 Type: Parallel talk Exclusion Limits on Neutral, Mono and Doubly Charged Vector Bosons at LHC Thursday, 11 July 2019 18:15 (15 minutes) In this work, we calculate limits on masses and couplings of neutral, mono and doubly-charged vec- tor bosons predicted by a class of models based on the SU(3)C ×SU(3)L×U(1)X symmetry group. These models offer an elegant explanation for the threefold replication of quark-lepton families. Different final states, including two, three and four leptons and leptons plus missing transverse energy are investigated. The processes cross-sections are estimated at the next to leading-order. A detector simulation is performed using the DELPHES package assuming the LHC center-of-mass energy of 13 TeV, with pile-up effects taken into account. Combining these calculations with the latest ATLAS results in different searches, we derive the most stringent bounds on masses and couplings for the predicted particles using LHC data. The results exclude the model vector bosons with masses within the range of 1 TeV to 4 TeV. Primary authors: ASEVEDO NEPOMUCENO, Andre (Federal University of of Rio de Janeiro (BR)); MEIROSE, Bernhard (University of Texas at Dallas (US)) Presenter: ASEVEDO NEPOMUCENO, Andre (Federal University of of Rio de Janeiro (BR)) Session Classification: Searches for New Physics Track Classification: Searches for New Physics October 4, 2021 Page 6 EPS-HEP2019 / Report of Contributions Searches for ultra long-lived partic … Contribution ID: 11 Type: Parallel talk Searches for ultra long-lived particles with MATHUSLA Friday, 12 July 2019 15:15 (15 minutes) With the current experiments at the particle accelerators, no search strategy will be able to observe the decay of neutral long-lived particles with masses above ~GeV and lifetimes at the limit set by Big Bang Nucleosynthesis (BBN), cτ ∼ 107-108 m. The MATHUSLA detector concept (MAssive Timing Hodoscope for Ultra-Stable neutraL pArticles) will be presented. It can be implemented on the surface above ATLAS or CMS detectors in time for the high-luminosity LHC operations, to search for neutral long-lived particles with lifetimes up to the BBN limit. The large area of the detector allows MATHUSLA to make important contributions also to cosmic-ray physics. We will also report on the analysis of data collected by the test stand installed on the surface above the ATLAS detector, the on-going background studies, and plans for
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