Conveners
Beyond the Standard Model: Block 1
- Michal Malinsky (Charles University (CZ))
- Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE))
Beyond the Standard Model: Block 2
- Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE))
- Michal Malinsky (Charles University (CZ))
Beyond the Standard Model: Block 3
- Tina Potter (University of Cambridge (GB))
- Sezen Sekmen (Kyungpook National University (KR))
Beyond the Standard Model: Block 4
- Sezen Sekmen (Kyungpook National University (KR))
- Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE))
Beyond the Standard Model: Block 5
- Tina Potter (University of Cambridge (GB))
- Michal Malinsky (Charles University (CZ))
Beyond the Standard Model: Block 6
- Michal Malinsky (Charles University (CZ))
- Tina Potter (University of Cambridge (GB))
Beyond the Standard Model: Block 7
- Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE))
- Sezen Sekmen (Kyungpook National University (KR))
Beyond the Standard Model: Block 8
- Michal Malinsky (Charles University (CZ))
- Tina Potter (University of Cambridge (GB))
Beyond the Standard Model: Block 9
- Sezen Sekmen (Kyungpook National University (KR))
- Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE))
Beyond the Standard Model: Block 10
- Sezen Sekmen (Kyungpook National University (KR))
- Michal Malinsky (Charles University (CZ))
Beyond the Standard Model: Block 11
- Tina Potter (University of Cambridge (GB))
- Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE))
Beyond the Standard Model: Block 12
- Isabell Melzer-Pellmann (Deutsches Elektronen-Synchrotron (DE))
- Tina Potter (University of Cambridge (GB))
The Short-Baseline Near Detector (SBND) is a 112-ton liquid argon time projection chamber 110 m away from the Booster Neutrino Beam (BNB) target at Fermilab (Illinois, USA). In addition to its role as a near detector enabling precision searches for short-baseline neutrino oscillations, the proximity of SBND to the BNB target makes the experiment ideal for many beyond the Standard Model (BSM)...
The MicroBooNE detector, an 85-tonne active mass liquid argon time projection chamber (LArTPC) at Fermilab, is ideally suited to search for physics beyond the standard model due to its excellent calorimetric, spatial, and energy resolution. We will present several recent results using data recorded with Fermilabโs two neutrino beams: a first search for dark-trident scattering in a neutrino...
The BDF/SHiP experiment is a general purpose intensity-frontier experiment for the search of feebly interacting GeV-scale particles and to perform neutrino physics measurements at the HI-ECN3 (high-intensity) beam facility at the CERN SPS, operated in beam-dump mode, taking full advantage of the available 4x$10^{19}$ protons per year at 400 GeV. The CERN Research Board recently decided...
The unique dimension-5 effective operator, LLHH, known as the Weinberg operator, generates tiny Majorana masses for neutrinos after electroweak spontaneous symmetry breaking. If there are new scalar multiplets that take vacuum expectation values (VEVs), they should not be far from the electroweak scale. Consequently, they may generate new dimension-5 Weinberg-like operators which in turn also...
We explore the potential of neutrinoless double-beta ($0\nu\beta\beta$) decays to probe scalar leptoquark models that dynamically generate Majorana masses at the one-loop level. By relying on Effective Field Theories, we perform a detailed study of the correlation between neutrino masses and the $0\nu\beta\beta$ half-life in these models. We describe the additional tree-level leptoquark...
The LHCb detector at the LHC offers unique coverage of forward rapidities. The detector also has a flexible trigger that enables low-mass states to be recorded with high efficiency, and a precision vertex detector that enables excellent separation of primary interactions from secondary decays. This allows LHCb to make significant (and world-leading) contributions in these regions of phase...
Several astrophysical observations indicate that the majority of the mass of the Universe is made of a new type of matter, called Dark Matter (DM), not interacting with light. DM may be composed of a dark sector (DS) of new particles, charged under a new U(1) gauge boson kinetically mixed with the ordinary photon, called dark photon (A'). The NA64 experiment at CERN aims to produce and detect...
We present the study of the massless dark photon ($\bar\gamma$) in the $K_{L}^{0}\rightarrow\gamma\bar\gamma$ decay at the J-PARC KOTO experiment. Distinguished from the massive dark photon, the massless one does not directly mix with the ordinary photon but could interact with Standard Model (SM) particles through direct coupling to quarks. Some theoretical models propose that the branching...
Flavour violation in axion models can be generated by choosing flavour non-universal Peccei-Quinn(PQ) charges. Such an axion is easily implemented in a UV completion with a DFSZ model: containing two Higgs doublets (PQ-2HDM) and the PQ scalar. This charge arrangement also produces flavour violation at tree level in the PQ-2HDM, which we will show it is directly correlated to the flavour...
We discuss dark matter phenomenology, neutrino magnetic moment and their masses in a Type-III radiative scenario. The Standard Model is enriched with three vector-like fermion triplets and two inert scalar doublets to provide a suitable platform for the above phenomenological aspects. The inert scalars contribute to total relic density of dark matter in the Universe. Neutrino aspects are...
The vector $U$-bosons, or so called 'dark photons', are one of the possible candidates for the dark matter mediators. We present a procedure to define theoretical constraints on the upper limit of $\epsilon^2(M_U)$ from heavy-ion as well as $p+p$ and $p+A$ dilepton data from SIS to LHC energies. We used the microscopic Parton-Hadron-String Dynamics (PHSD) transport approach which reproduces...
Supersymmetric models with the anomaly-mediated SUSY breaking (AMSB) have run into serious conflicts with 1. LHC sparticle and Higgs mass constraints, 2. constraints from wino-like WIMP dark matter searches and 3. bounds from naturalness. These conflicts may be avoided by introducing changes to the underlying phenomenological models providing a setting for natural anomaly-mediation (nAMSB). We...
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. With increasing mass bounds on MSSM scenarios other non-minimal variations of supersymmetry become increasingly interesting. This talk will present the latest results of searches conducted by the ATLAS experiment...
Since the classic searches for supersymmetry under R-parity conserving scenarios have not given any strong indication for new physics yet, more and more supersymmetry searches are carried out on a wider range of supersymmetric scenarios. This talk focuses on searches looking for signatures of stealth and R-parity-violating supersymmetry. The results are based on proton-proton collisions...
Supersymmetry (SUSY) models with featuring small mass splittings between one or more particles and the lightest neutralino could solve the hierarchy problem as well as offer a suitable dark matter candidate consistent with the observed thermal-relic dark matter density. However, the detection of SUSY higgsinos at the LHC remains challenging especially if their mass-splitting is O(1 GeV) or...
A wide variety of searches for Supersymmetry have been performed by experiments at the Large Hadron Collider. In this talk, we focus on searches for electroweak production of Supersymmetric particles as well as third generation Supersymmetric particles. Some analyses are optimized for Supersymmetric particles in compressed spectra. The results are obtained from the proton-proton collision data...
upersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. Naturalness arguments favour supersymmetric partners of the gluons and third-generation quarks with masses light enough to be produced at the LHC. This talk will present the latest results of searches conducted by the...
Electroweak-inos, superpartners of the electroweak gauge and Higgs bosons, play a special role in supersymmetric theories. Their intricate mixing into chargino and neutralino mass eigenstates leads to a rich phenomenology, which makes it difficult to derive generic limits from LHC data. We present a global analysis of LHC constraints for promptly decaying electroweak-inos in the context of the...
In the quest for physics beyond the Standard Model, TeV-scale New Physics (NP) remains a very attractive possibility. However, this is challenged by constraints across different energy scales, from flavour observables to high-$p_T$ searches at the LHC, going through electroweak precision tests. The emerging picture is that TeV-scale NP cannot have a generic flavour structure. In particular,...
The interpretation of LHC data, and the assessment of possible hints of new physics (NP), require precise knowledge of the proton structure in terms of parton distribution functions (PDFs). These are usually extracted with a data-driven approach, assuming that the underlying theory is the SM, and later used as inputs for theoretical predictions in searches for NP. The evident inconsistency of...
The Drell Yan (DY) scattering is an highly sensitive probe for new physics. Indeed, being a well measured phenomenon, any deviation between experimental and theoretical results could point at new physics beyond the Standard Model. To enable precise comparisons between theory and experimental data, extensive calculations have been performed in both the electroweak and QCD sectors of the...
There is a convincing case for some form of supersymmetry, but not a single superpartner has yet been observed. Here we consider a radically different form of supersymmetry, which initially combines standard Weyl fermion fields and primitive (unphysical) boson fields. A stable vacuum then requires that the initial boson fields be transformed into the usual complex fields $\phi$, auxiliary...
The Muon g-2 Experiment at Fermilab, whose second result was published in August 2023, conducts the worldโs most precise measurement of the anomalous magnetic moment of the muon. Muon g-2 data can be used to search for a sidereal variation of the anomalous spin precession of the muon, one of the important signatures of CPT and Lorentz Invariance Violation (LIV) in the muon sector. The BNL...
The observed matter-antimatter asymmetry in the universe is a serious challenge to our understanding of nature. BNV/LNV decays have been searched for in many experiments to understand this large-scale observed fact. In this talk, we present recent results on searches for BNV and LNV decays of charmed meson, hyperons and light hadrons at the BESIII experiment.
Charged Lepton Flavor Violation (cLFV) is highly suppressed in the Standard Model (SM) by the finite, but tiny neutrino masses. Its branching fraction is calculated to be extremely small in the SM and so far no charged lepton flavour violating process has been found in experiments, including searches performed in lepton ($\mu$, $\tau$) decays, pseudoscalar meson (K, $\pi$) decays, vector meson...
Lorentz and CPT symmetry in the quark sector of the Standard Model are studied in the context of an effective field theory using ZEUS $e^{\pm}p$ data. Symmetry-violating effects can lead to time-dependent oscillations of otherwise time-independent observables, including scattering cross sections. An analysis using five years of inclusive neutral-current deep inelastic scattering events...
The HIBEAM/NNBAR experiment is a two stage experiment for the European Spallation
Source to search for baryon number violation. The experiment would make high sensitivity searches for baryon number violating processes: n โ nbar and n โ nโฒ(neutron to sterile neutron), corresponding to the selection rules in baryon number ฮB = 2, 1 , respectively. The experiment addresses open questions such as...
We introduce a modification to the standard expression for tree-level CP-violation in scattering processes at the LHC, which is important when the initial state in not self-conjugate. Based on that, we propose a generic and model-independent search strategy for probing tree-level CP-violation in inclusive multi-lepton signals. Then, as an illustrative example, we show that higher-dimension...
Modular Invariance is a relatively new approach to the flavour problem: in special cases, only one flavon is needed to reproduce the neutrino masses and mixing parameters, with just a small number of free parameters. By combining this framework with generalised CP-symmetry, one can determine that the flavon vacuum expectation value also dictates the CP-violation of the lepton sector. Hence,...
Flavor deconstruction refers to ultraviolet completions of the Standard Model where the gauge group is split into multiple factors under which fermions transform non-universally. We propose a mechanism for charging same-family fermions into different factors of a deconstructed gauge theory in a way that gauge anomalies are avoided. The mechanism relies in the inclusion of a strongly-coupled...
Lepton flavor violation in tau decays, an unambiguous signature of New Physics, has been searched in many channels by multiple collaborations, including BaBar, Belle, Belle II, LHCb, ATLAS and CMS. Combined upper limits as compiled by the Tau subgroup of the Heavy Flavor Averaging group are presented, for channels where multiple searches provide significant contributions.
I will describe a Left-Right symmetric model that provides an explanation for the mass hierarchy of the charged fermions within the framework of the Standard Model. This explanation is achieved through the utilization of both tree-level and radiative seesaw mechanisms. In this model, the tiny masses of the light active neutrinos are generated via a three-loop radiative inverse seesaw...
$E_6$ Grand Unified Theories introduce novel symmetry-breaking patterns compared to the more common $SU(5)$ and $SO(10)$ GUT. We explore in this talk how $SU(3)^3$ (trinification), $SU(6)\times SU(2)$ and $SO(10)\times U(1)$ symmetries can explicitly arise from $E_6$ at an intermediate breaking stage.
Due to perturbative limitations associated with very large $E_{6}$ representations, the...
Left-Right Models (LRMs) are one of most relevant extensions of the Standard Model (SM) of particle physics. They introduce a new gauge sector and can restore parity (P) or charge conjugation (C) symmetries at high enough energies. These theories can be embedded in other more fundamental ones with larger gauge groups. Consequently, the restoration of the C or P symmetries can be pushed towards...
Many new physics models such as compositeness, extra dimensions, extended Higgs sectors, supersymmetry, and dark sectors are expected to manifest themselves in the final states with photons. This talk presents searches in CMS for new phenomena in the final states that include photons, focusing on the recent results obtained using the full Run-II data-set collected by the CMS Experiment at the LHC.
Although the LHC experiments have searched for and excluded many proposed
new particles up to masses close to 1 TeV, there are many scenarios that
are difficult to address at a hadron collider. This talk will review a
number of these scenarios and present the expectations for searches at an
electron-positron collider such as the International Linear Collider.
The Circular Electron Positron Collider (CEPC) is a large-scale collider facility that can serve as a factory of the Higgs, Z, and W bosons and is upgradable to run at the ttbar threshold. While it also has a tremendous potential to search for the direct production of new physics states, which including Supersymmetry, Dark Matter and Dark Sector, Long-Lived Particles, and more. This talk will...
High-Electric-Charge compact Objects (HECOs) appear in several theoretical particle physics models beyond the Standard Model, and are actively searched for in current colliders, such as the LHC. In such searches, mass bounds of these objects have been placed, using Drell-Yan and photon-fusion processes at tree level so far. However, such estimates are not reliable, given that, as a result of...
The Belle Collaboration recently measured the complete set of angular coefficient functions for the exclusive decays $\bar{B} \to D^*(D \pi)\ell \bar{\nu}_\ell$, where $\ell = e, \mu$, into four bins of the parameter $w = \frac{m^2_B + m^2_{D^โ} โ q^2}{2m_B m_{D^*}}$, with $q$ representing the momentum of the lepton pair. In SM these measurements are instrumental in determining the hadronic...
Motivated by the remarkable Belle II experimental result on $B\to K ^{}\, E_{\rm miss}$, and phenomenological difficulties in accommodating it exclusively in terms of processes with SM neutrino final states, we systematically investigate possibilities that $E_{\rm miss}$ comes not only from the SM neutrinos but also from other light undetected particles. We consider both single scalar or...
The first search for $K_L^0 \rightarrow \pi^0 e^+e^-e^+e^-$ is performed with a dataset collected by the J-PARC KOTO experiment in 2021. In the dark sector model, this final state can be achieved through $K_L^0 \rightarrow \pi^0 X X, X\rightarrow e^+e^-$. The branching ratio of this decay mode is predicted to be $\mathcal{O}$($10^{-10}$) dominated by the virtual photon vertex through...
A resonant structure has been observed at ATOMKI in the invariant mass of electron-positron pairs, interpreted as the production of a hypothetical particle (X17).
The MEG II apparatus at PSI, designed to search for the ฮผ+ โ e+ ฮณ, can perform also the X17 search.
Protons from a CW accelerator, with an energy up to 1 MeV, was delivered on a dedicated Li-based targets (with thicknesses up...
The recent ATOMKI experiments provided evidence pointing towards the existence of an X17 boson in the anomalous nuclear transitions of Beryllium-8, Helium-4, and Carbon-12. The favored ranges for X17 boson couplings to u and d quarks are determined through fittings to these nuclear transitions. In this work, we consider X17 boson contributions to the previously measured $D$ meson decays,...
The quest for new physics is a major aspect of the CMS experimental program. This includes a myriad of theoretical models involving resonances that can decay to massive bosons, photons, leptons or jets. This talk presents an overview of such analyses with an emphasis on new results and the novel techniques developed by the CMS collaboration to boost the search sensitivity. The searches are...
Many new physics models predict the existence of new, heavy particles. This talk summarizes recent ATLAS searches for Beyond-the-Standard-Model heavy resonances which decay to quarks, or leptons, using Run 2 data collected at the LHC.
We present results of searches for massive vector-like top and bottom quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. Single and pair production of vector-like quarks are studied, with decays into a variety of final states, containing top and bottom quarks, electroweak gauge and Higgs bosons. We search...
The Standard Model of Particle Physics explains many natural phenomena yet remains incomplete. Leptoquarks (LQs) are hypothetical particles predicted to mediate interactions between quarks and leptons, bridging the gap between the two fundamental classes of particles. Vectorlike quarks (VLQs) lie at the heart of many extensions seeking to address the Hierarchy Problem, as they can naturally...
Leptoquarks are hypothetical particles with non-zero lepton and baryon numbers, predicted by many extensions of the Standard Model, and can provide an explanation for the similarity between the quark and lepton sectors. We present searches for leptoquarks that have been carried out by the CMS Experiment with a focus on the most recent results with the full integrated luminosity of the Run-II...
We present an overview of searches for new physics with top and bottom quarks in the final state, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. The results cover non-SUSY based extensions of the SM, including heavy gauge bosons or excited third generation quarks. Decay channels to vector-like top partner quarks, such as...
Many extensions to the Standard Model predict new particles decaying into two bosons (W, Z, photon) making these important signatures in the search for new physics. Searches for such diboson resonances have been performed in different final states and novel analysis techniques, including unsupervised learning, are also used to extract new features from the data. This talk summarises such...
A summary of searches for heavy resonances with masses exceeding 1 TeV decaying into pairs or triplets of bosons is presented, performed on data produced by LHC pp collisions at sqrt{s}=13TeV and collected with the CMS detector during 2016 - 2018. The common feature of these analyses is the boosted topology, namely the decay products of the considered bosons (both electroweak W, Z bosons and...
Beyond the standard model theories with extended Higgs sectors (e.g. SUSY) or extra spatial dimensions predict resonances with large branching fractions in a pair of Higgs bosons with negligible branching fractions to light fermions. We present an overview of searches for new physics containing Higgs boson pairs in the final state, using proton-proton collision data collected with the CMS...
Many theories beyond the Standard Model (SM) predict new physics phenomena that decay hadronically to dijet or multijet final states. This talk summarises the latest results from the ATLAS detector using the Run-2 dataset, involving these final states. A number of sensitive kinematics are explored, including the invariant mass and angular distributions. More exclusive final states and novel...
The smallness of neutrino masses in conjunction with together their observed oscillations could be pointing to physics beyond the standard model that can be naturally accommodated by the so-called "seesaw" mechanism, in which new Heavy Neutral Leptons (HNL) are postulated. Several models with HNLs exist that incorporate the seesaw mechanism, sometimes also providing a DM candidate or giving a...
BSM theories extending the Standard Model gauge group are well motivated by grand unification, compositeness or flavor symmetries, and naturally introduce additional gauge bosons. Existing experimental bounds coming from LHC exclude the existence of an additional neutral gauge boson Z' with masses of up to about 5 TeV, depending on the model. The reach could be extended at future lepton...
The origin of the neutrinos masses, baryon asymmetry in the universe, and the nature โจof dark matter remain fundamental open problems in HEP. The FCC-ee provides exciting opportunities to resolve these mysteries with the discovery of heavy neutral leptons (HNLs) via e+e- โ Z โ vN by exploiting a huge sample ($5\cdot 10^{12}$) of Z bosons. The expected very small mixing between light and heavy...
We reinvestigate contributions of scalar leptoquarks in $R_D^{(*)}$ anomalies and in $B \to K^{(*)} \nu \bar \nu$ decays.Then, we update the constraints on parameter space and find which scalar leptoquarks remain viable and consistent with low-energy and high-energy flavour physics constraints. We comment on the implications of such selection.
We study how the recent experimental results constrain the
gauge sectors of U(1) extensions of the standard model
using a novel representation of the parameter space.
We determine the bounds on the mixing angle between the massive
gauge bosons, or equivalently, the new gauge coupling as a function of
the mass $M_{Z'}$ of the new neutral gauge boson $Z'$ in the
approximate range...
Conventional searches at the LHC operate under the assumption that Beyond the Standard Model particles undergo immediate decay upon production. However, this assumption lacks inherent a priori justification. This talk delves into the exploration of displaced decay signatures across various collider experiments. Combining insights from several studies, we show how small Yukawa couplings,...
Various theories beyond the Standard Model predict new, long-lived particles decaying at a significant distance from the collision point. These unique signatures are difficult to reconstruct and face unusual and challenging backgrounds. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer are examples of experimentally demanding signatures....
Many models beyond the standard model predict new particles with long lifetimes. These long-lived particles (LLPs) decay significantly displaced from their initial production vertex thus giving rise to non-conventional signatures in the detector. Dedicated data streams and innovative usage of the CMS detector boost are exploited in this context to significantly boost the sensitivity of such...
FASER, the ForwArd Search ExpeRiment, has successfully taken data at the LHC since the start of Run 3 in 2022. From its unique location along the beam collision axis 480 m from the ATLAS IP, FASER has set leading bounds on dark photon parameter space in the thermal target region and has world-leading sensitivity to many other models of long-lived particles. In this talk, we will give a full...
The NA62 experiment at CERN, designed to measure the highly-suppressed decay $K^{+} \rightarrow \pi^{+}\nu\bar{\nu}$, has the capability to collect data in a beam-dump mode, where 400 GeV protons are dumped on an absorber. In this configuration, New Physics (NP) particles, including dark photons, dark scalars and axion-like particles, may be produced and reach a decay volume beginning 80 m...
The MoEDAL experiment at IP8 on the LHC ring is the 7th LHC experiment and the 1st dedicated to the search for BSM physics. It took data at LHCโs Run-1&2. The MoEDAL detector is an unconventional and mostly passive detector dedicated to the search for Highly Ionizing Particle (HIP) avatars of new physics. An upgraded MoEDAL detector, installed for Run-3, is currently taking data allowing us...
Many extensions of the Standard Model with Dark Matter candidates predict new long-lived particles (LLP). The LHC provides an unprecedented possibility to search for such LLP produced at the electroweak scale and above. The ANUBIS concept foresees instrumenting the ceiling and service shafts above the ATLAS experiment with tracking stations in order to search for LLPs with decay lengths of...
Signatures of new physics at the LHC are varied and by nature often very different from those of Standard Model processes. Novel experimental techniques, including dedicated datastreams are exploited to boost the sensitivity of the CMS Experiment to search for such signatures. In this talk we highlight the most recent CMS results, obtained using the data collected at the LHC Run-II through the...
