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8th RED LHC workshop

28–30 May 2024
Universidad Complutense de Madrid (UCM)
Europe/Madrid timezone

Contribution List

53 out of 53 displayed
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  1. 30. Measurement of differential cross sections in t¯t and t¯t+jets production in the lepton+jets decay mode in pp collisions at √s= 13 TeV using 140 fb−1 of ATLAS data
    Prof. Claudia Glasman (Universidad Autonoma de Madrid (ES))
    28/05/2024, 15:45
  2. 31. A dynamical implementation of canonical second quantization on a quantum computer
    Felipe J. Llanes-Estrada
    28/05/2024, 16:05
  3. 32. New WW Cross Section Measurement at sqrt(s) = 13.6 TeV with the CMS detector
    Alicia Calderon Tazon (Universidad de Cantabria and CSIC (ES))
    28/05/2024, 16:25
  4. 33. Early top quark measurements with Run3 data by the CMS experiment
    Barbara Alvarez Gonzalez (Universidad de Oviedo (ES))
    28/05/2024, 17:15
  5. 34. Theoretical predictions to differential cross sections and decay rates from the loop-tree duality
    Prasanna Kumar Dhani (IFIC, CSIC-UV)
    28/05/2024, 17:35
  6. 35. Direct measurement of the top-quark mass with ATLAS
    Javier Jimenez Pena (IFAE Barcelona)
    28/05/2024, 17:55
  7. 36. Standard Model Extensions and matching to SMEFT/HEFT
    Mr Carlos Quezada Calonge (Universidad Complutense de Madrid)
    29/05/2024, 10:00
  8. 37. Multi-Higgs Production in EFT
    Javier Martínez Martín (Universidad Complutense de Madrid & IPARCOS)
    29/05/2024, 10:20
  9. 38. EFT Working Group activities
    Javier Fuentes-Martin (Universidad de Granada)
    29/05/2024, 10:40
  10. 44. SUSY searches at the LHC: Consistent Excesses at ATLAS and CMS
    Sven Heinemeyer (CSIC (Madrid, ES))
    29/05/2024, 11:30
  11. 45. Long-lived particle searches with the CMS experiment. Present and future
    Santiago Folgueras (Universidad de Oviedo (ES))
    29/05/2024, 11:50
  12. 46. The ABC of RPV: classification of R-parity violating signatures at the LHC
    Victor Martin Lozano (IFIC/UV)
    29/05/2024, 12:10
  13. 47. Search for supersymmetric particle pair production in final states with two oppositely charged leptons and large missing transverse momentum in the full RunII data set
    Pablo Matorras-Cuevas (Instituto de Física de Cantabria (ES))
    29/05/2024, 12:30
  14. 48. Search for heavy scalar and pseudo-scalar in ttbar and four-top final states in pp collisions with the ATLAS detector
    Quake Qin (Institut de Fisica d'Altes Energies (IFAE))
    29/05/2024, 15:00
  15. 49. Emerging jet probes of strongly interacting dark sectors
    Dr José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))
    29/05/2024, 15:20
  16. 50. Machine-Learning Collider Analysis of Radiative Neutralino Decays at the LHC
    Dr Rosa María Sandá Seoane (Instituto de Física Teórica UAM-CSIC)
    29/05/2024, 15:40
  17. 53. COmpact DEtector for EXotics at LHCb: CODEX-b
    Carlos Vazquez Sierra (Universidade de Santiago de Compostela (ES))
    29/05/2024, 16:00
  18. 51. S-wave contribution to rare D0 decays in the Standard Model and sensitivity to New Physics
    Mr Luiz Vale Silva
    29/05/2024, 17:00
  19. 52. Study of exclusive processes in ultra-peripheral collisions at LHCb
    Charlotte Van Hulse (Universidade de Santiago de Compostela (ES))
    29/05/2024, 17:20
  20. 54. LFU measurements at LHCb in semileptonic B decays
    Arnau Brossa Gonzalo (Universidade de Santiago de Compostela (ES))
    29/05/2024, 17:40
  21. 39. Constraints on anomalous Higgs boson couplings in the HWW channel
    Dermot Anthony Moran (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))
    30/05/2024, 10:00
  22. 40. Di-Higgs Production at the LHC: Theory vs. Experiment
    Sven Heinemeyer (CSIC (Madrid, ES))
    30/05/2024, 10:20
  23. 41. Di-Higgs Production via Axion Like Particles
    Dr Alexandre Salas-Bernárdez (Universidad Complutense de Madrid)
    30/05/2024, 10:40
  24. 43. Di-Higgs Production Associated with Dark Matter at the LHC: A Machine-Learning Analysis
    Prof. Ernesto Arganda (Department of Theoretical Physics and Institute for Theoretical Physics (IFT) UAM-CSIC, Universidad Autónoma de Madrid)
    30/05/2024, 11:30
  25. 42. Aligned two Higgs doublet model and the global fits
    Anirban Karan
    30/05/2024, 11:50
  26. 55. Actualización de la Estrategia Europea
    Isabel Josa Mutuberria (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))
    30/05/2024, 12:40
  27. 4. $S$-wave contribution to rare $D^0 \to \pi^+ \pi^- \ell^+ \ell^-$ decays in the Standard Model and sensitivity to New Physics
    Mr Luiz Vale Silva

    Physics of the up-type flavour offers unique possibilities of testing the Standard Model (SM) compared to the down-type flavour sector. Here, I discuss SM and New Physics (NP) contributions to the rare charm-meson decay $ D^0 \to \pi^+ \pi^- \ell^+ \ell^- $. In particular, I discuss the effect of including the lightest scalar isoscalar resonance in the SM picture, namely, the $f_0 (500)$,...

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  28. 1. A dynamical implementation of canonical second quantization on a quantum computer
    Felipe J. Llanes-Estrada

    We provide the necessary theoretical methods for the implementation of creation and destruction operators in separate registers of a quantum computer, allowing for a transparent and dynamical creation and destruction of particle modes in second quantization in problems with variable particle number. We establish theorems for the commutation (anticommutation) relations and provide the needed...

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  29. 18. Aligned two Higgs doublet model and the global fits
    Anirban Karan

    Aligned two Higgs doublet model (ATHDM) is one of the simplest extensions of the Standard Model (SM). It assumes the existence of two scalar doublets with similar Yukawa structure. This assumption forbids undesirable flavour changing neutral currents (FCNCs) at tree level without imposition of any $Z_2$ symmetry. A2HDM also provides the opportunity to study different varieties of 2HDMs under a...

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  30. 28. Coffee Break
  31. 21. COmpact DEtector for EXotics at LHCb: CODEX-b
    Carlos Vazquez Sierra (Universidade de Santiago de Compostela (ES))

    The COmpact DEtector for EXotics at LHCb (CODEX-b) is a particle physics detector dedicated to displaced decays-in-flight of exotic long-lived particles (LLPs), compelling signatures of dark or hidden sectors Beyond the Standard Model, which arise in theories containing a hierarchy of scales and/or small parameters. CODEX-b is planned to be installed near the LHCb interaction point and makes...

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  32. 8. Constraints on anomalous Higgs boson couplings in the HWW channel
    Dermot Anthony Moran (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))

    High precision Higgs coupling measurements are mandatory to establish the exact nature of the electroweak symmetry breaking mechanism and to pin down possible effects of BSM physics. Higgs coupling measurements are generally done in the kappa framework, which is based on inclusive production and decay rates, it is therefore blind to any tension in differential distributions. It also assumes...

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  33. 22. Di-Higgs Production Associated with Dark Matter at the LHC: A Machine-Learning Analysis
    Prof. Ernesto Arganda (Dept. of Theoretical Physics and Institute for Theoretical Physics (IFT) UAM-CSIC, Universidad Autónoma de Madrid)

    Di-Higgs production at the LHC associated with missing transverse energy is explored in the context of simplified models that generically parameterize a large class of models with heavy scalars and dark matter candidates. Our aim is to figure out the improvement capability of machine-learning tools over traditional cut-based analyses. In particular, boosted decision trees and neural networks...

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  34. 9. Di-Higgs Production at the LHC: Theory vs. Experiment
    Sven Heinemeyer (CSIC (Madrid, ES))

    We investigate di-Higgs production at the (HL-)LHC in the Two Higgs Doublet Model (2HDM). We discuss the impact of higher-order corrections and interference effects. We demonstrate the problems applying experimental limits to realistic UV-complete models

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  35. 13. Di-Higgs Production via Axion Like Particles
    Dr Alexandre Salas-Bernárdez (Universidad Complutense de Madrid)

    Due to the pseudo-scalar nature of the axion-like particle (ALP), the CP-conserving production of two Higgs bosons via the ALP necessarily involves an additional $Z$ or $\gamma$ boson. We examine the existing constraints from di-Higgs searches at Run 2 of the LHC and find that, despite the presence of extra objects in the final state, these searches are sensitive to ALP couplings. We compare...

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  36. 25. Direct measurement of the top-quark mass with ATLAS
    Javier Jimenez Pena (IFAE Barcelona)

    In this talk, the measurement of the top-quark mass in top-quark pair production using the full Run 2 dataset collected with the ATLAS experiment at √s = 13 TeV will be presented. The measurement is carried out in the dilepton channel using a template method. The talk will have a special emphasis on the theoretical uncertainties affecting experimental measurements of the top-quark mass, as...

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  37. 7. Early top quark measurements with Run3 data by the CMS experiment
    Barbara Alvarez Gonzalez (Universidad de Oviedo (ES))

    After more than three years of upgrade and maintenance work, a new period of LHC data taking started in 2022 with a record collision energy of 13.6 TeV. This presentation will be focused on top quark and standard model measurements performed with 2022 data collected by the CMS experiment at this new energy regime. The measurements of single top tW inclusive and differential cross sections and...

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  38. 17. EFT Working Group activities
    Javier Fuentes-Martin (Universidad de Granada)

    I will summarize some of the recent activities of the Effective Field Theory (EFT) Working Group, with special emphasis on those in area 5 (Benchmark Scenarios from UV Models). I also will review the current status of automated tools for EFT matching, highlighting their potential and applications to the field.

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  39. 3. Emerging jet probes of strongly interacting dark sectors
    Dr José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))

    Emerging jets are jets with multiple displaced tracks, which originate from the decay of long-lived bound states of a strongly interacting dark sector. In this talk I will summarize our attempts to "validate" the CMS emerging jet search, showing that we are able to reproduce, within reasonable accuracy, the limits obtained by the CMS collaboration in their benchmark model.

    The derived...

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  40. 27. LFU measurements at LHCb in semileptonic B decays
    Arnau Brossa Gonzalo (Universidade de Santiago de Compostela (ES))

    Lepton flavour universality is conserved in the Standard Model, however still
    nowadays, many experimental measurements of lepton flavor universality ratios
    exhibit a non-negligible tension with respect the theory predictions, which has a
    notable low uncertainty. This makes LFU measurements a gateway for the search of
    new physics which must be investigated to solve this tension. The LHCb...

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  41. 15. Long-lived particles searches with the CMS experiment. Present and future.
    Santiago Folgueras (Universidad de Oviedo (ES))

    Long-lived particles (LLPs) are predicted in many well-motivated theories of BSM physics, and naturally arise from the presence and breaking of symmetries, which can be motivated by cosmology and the nature of dark matter, neutrino masses, as well as solutions to the hierarchy problem. If these long-lived particles (LLPs) were to be produced at the LHC, they could decay far from the...

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  42. 20. Machine-Learning Collider Analysis of Radiative Neutralino Decays at the LHC
    Dr Rosa María Sandá Seoane (Instituto de Física Teórica UAM-CSIC)

    The search for weakly interacting particles is one of the main objectives of the high luminosity LHC. In the Minimal Supersymmetric Extension of the Standard Model (MSSM), these particles include the lightest neutralino, which is a good Dark Matter (DM) candidate and whose relic density may be fixed to realistic values through its co-annihilation with the second lightest neutralino and...

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  43. 16. Measurement of differential cross sections in t¯t and t¯t+jets production in the lepton+jets decay mode in pp collisions at √s= 13 TeV using 140 fb−1 of ATLAS data
    Prof. Claudia Glasman (Universidad Autonoma de Madrid (ES))

    Differential cross sections for top-quark pair production, inclusively and in association with jets, are measured in pp collisions at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC using an integrated luminosity of 140 fb−1. The events are selected with one charged lepton (electron or muon) and at least four jets. The differential cross sections are presented at particle...

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  44. 6. Multi-Higgs Production in EFT
    Javier Martínez Martín (Universidad Complutense de Madrid & IPARCOS)

    We have studied the phenomenological implications of multiple Higgs boson production from longitudinal vector boson scattering in the context of effective field theories. We found compact representations for effective tree-level amplitudes with up to four final state Higgs bosons. Total cross sections are then computed for scenarios relevant at the LHC in which we found the general Higgs...

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  45. 12. New WW Cross Section Measurement at sqrt(s) = 13.6 TeV with the CMS detector.
    Alicia Calderon Tazon (Universidad de Cantabria and CSIC (ES))

    A measurement of the WW boson pair production cross section in proton-proton collisions at sqrt(s) = 13.6 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC in 2022, and correspond to an integrated luminosity of 35fb-1. The WW candidate events are selected by requiring one electron and one muon of opposite charge. A sequence of requirements on...

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  46. 29. Reception
  47. 26. Search for heavy scalar and pseudo-scalar in ttbar and four-top final states in pp collisions with the ATLAS detector
    Quake Qin (Institut de Fisica d'Altes Energies (IFAE))

    New massive scalar or pseudo-scalar states with strong couplings to the top quark are predicted in numerous extensions of the Standard Model. These include models with an extended Higgs sector, such as Two-Higgs-Doublet Models (2HDMs). In this talk, two recent searches for new scalar and pseudo-scalar particles with couplings to the top quark using the full LHC Run-2 dataset are presented....

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  48. 14. Search for supersymmetric particle pair production in final states with two oppositely charged leptons and large missing transverse momentum in the full RunII data set
    Pablo Matorras-Cuevas (Instituto de Física de Cantabria (ES))

    We report the results of a search for symmetric particle pair production in $138~fb^{-1}$ of pp collisions at $\sqrt{s} = 13$ TeV collected by the CMS detector during the LHC RunII data taking period. We use a sample of events with two oppositely charged leptons (electrons or muons) and large missing transverse momentum to perform the search. The results are interpreted in terms of several...

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  49. 5. Standard Model Extensions and matching to SMEFT/HEFT
    Mr Carlos Quezada Calonge (Universidad Complutense de Madrid)

    Although Effective Field Theories (EFTs) can be used to describe physics up to a given energy scale, the question of what lies beneath the EFT subsides, and eventually, a connection between the UltraViolet (UV) Theory and the EFT becomes necessary. In the last decade, the description of the electroweak sector has been addressed by two EFTs: the Standard Model Effective Field Theory (SMEFT) and...

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  50. 23. Study of exclusive processes in ultra-peripheral collisions at LHCb
    Charlotte Van Hulse (Universidade de Alcalá)

    The study of exclusive processes in lepton-hadron and in ultra-peripheral hadron-hadron collisions provides information on the three-dimensional distribution of quarks and gluons as a function of their longitudinal momentum and transverse position inside the hadron, where the longitudinal direction corresponds to the direction of the probe used to investigate the hadron. This will be...

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  51. 10. SUSY searches at the LHC: Consistent Excesses at ATLAS and CMS
    Sven Heinemeyer (CSIC (Madrid, ES))

    We review recent searches for SUSY at the LHC in the channel $pp \to \tilde\chi^0_2 \tilde\chi^\pm_1 \to Z \tilde\chi^0_1\;W^\pm\tilde\chi^0_1$. For masses at $\sim 200$ GeV and small mass differences between the lightest and next-to-lightest SUSY particles these searches show consistent excesses at ATLAS and CMS. We interpret these excesses for the cases of wino/bino Dark Matter and higgsino...

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  52. 24. The ABC of RPV: classification of R-parity violating signatures at the LHC
    Victor Martin Lozano (IFIC/UV)

    We perform a classification of all potential supersymmetric R-parity violating signatures at the LHC to address the question: are existing bounds on supersymmetric models robust, or are there still signatures not covered by existing searches, allowing LHC-scale supersymmetry to be hiding? We analyze all possible scenarios with one dominant RPV trilinear coupling at a time, allowing for...

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  53. 19. Theoretical predictions to differential cross sections and decay rates from the loop-tree duality
    Mr Prasanna Kumar Dhani (IFIC, CSIC-UV)

    Understanding the cancellation of ultraviolet and infrared singularities in perturbative quantum field theory is of central importance for the development and automation of various theoretical tools that make accurate predictions for observables at high-energy colliders. The loop-tree duality aims to find an efficient solution by treating loop and tree-level contributions under the same foot...

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