With the establishment and maturation of the experimental programs searching for new physics with sizeable couplings at the LHC, there is an increasing interest in the broader particle and ...astrophysics community for exploring the physics of light and feebly-interacting particles as a paradigm complementary to a New Physics sector at the TeV scale and beyond. FIPs 2020 has been the first workshop fully dedicated to the physics of feebly-interacting particles and was held virtually from 31 August to 4 September 2020. The workshop has gathered together experts from collider, beam dump, fixed target experiments, as well as from astrophysics, axions/ALPs searches, current/future neutrino experiments, and dark matter direct detection communities to discuss progress in experimental searches and underlying theory models for FIPs physics, and to enhance the cross-fertilisation across different fields. FIPs 2020 has been complemented by the topical workshop “Physics Beyond Colliders meets theory”, held at CERN from 7 June to 9 June 2020. This document presents the summary of the talks presented at the workshops and the outcome of the subsequent discussions held immediately after. It aims to provide a clear picture of this blooming field and proposes a few recommendations for the next round of experimental results.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
Selectron NLSP in gauge mediation Calibbi, Lorenzo; Mariotti, Alberto; Petersson, Christoffer ...
The journal of high energy physics,
09/2014, Letnik:
2014, Številka:
9
Journal Article
Recenzirano
Odprti dostop
A
bstract
We discuss gauge mediation models in which the smuon and the selectron are mass-degenerate co-NLSP, which we, for brevity, refer to as selectron NLSP. In these models, the stau, as well as ...the other superpartners, are parametrically heavier than the NLSP. We start by taking a bottom-up perspective and investigate the conditions under which selectron NLSP spectra can be realized in the MSSM. We then give a complete characterization of gauge mediation models realizing such spectra at low energies. The splitting between the slepton families is induced radiatively by the usual hierarchies in the Standard Model Yukawa couplings and hence, no new sources of flavour misalignment are introduced. We construct explicit weakly coupled messenger models which give rise to selectron NLSP, while accommodating a 126 GeV MSSM Higgs mass, both within the framework of General Gauge Mediation and in extensions where direct couplings between the messengers and the Higgs fields are present. In the latter class of models, large A-terms and relatively light stops can be achieved. The collider signatures of these models typically involve multilepton final states. We discuss the relevant LHC bounds and provide examples of models where the decay of the NLSP selectron is prompt, displaced or long-lived. The prompt case can be viewed as an ultraviolet completion of a simplified model recently considered by the CMS collaboration.
We investigate multilepton LHC signals arising from electroweak processes involving sleptons. We consider the framework of general gauge mediated supersymmetry breaking, focusing on models where the ...low mass region of the superpartner spectrum consists of the three generations of charged sleptons and the nearly massless gravitino. We demonstrate how such models can provide an explanation for the anomalous four lepton events recently observed by the CMS Collaboration, while satisfying other existing experimental constraints. The best fit to the CMS data is obtained for a selectron/smuon mass of around 145 GeV and a stau mass of around 90 GeV. These models also give rise to final states with more than four leptons, offering alternative channels in which they can be probed and we estimate the corresponding production rates at the LHC.
The Snowmass report on rare processes and precision measurements recommended Mu2e-II and a next generation muon facility at Fermilab (Advanced Muon Facility) as priorities for the frontier. The ...Workshop on a future muon program at FNAL was held in March 2023 to discuss design studies for Mu2e-II, organizing efforts for the next generation muon facility, and identify synergies with other efforts (e.g., muon collider). Topics included high-power targetry, status of R&D for Mu2e-II, development of compressor rings, FFA and concepts for muon experiments (conversion, decays, muonium and other opportunities) at AMF. This document summarizes the workshop discussions with a focus on future R&D tasks needed to realize these concepts.
The Compact Linear Collider (CLIC) is a mature option for the future of high energy physics. It combines the benefits of the clean environment of \(e^+e^-\) colliders with operation at high ...centre-of-mass energies, allowing to probe scales beyond the reach of the Large Hadron Collider (LHC) for many scenarios of new physics. This places the CLIC project at a privileged spot in between the precision and energy frontiers, with capabilities that will significantly extend knowledge on both fronts at the end of the LHC era. In this report we review and revisit the potential of CLIC to search, directly and indirectly, for physics beyond the Standard Model.
A detailed knowledge of the decay properties of the so called Hoyle state in the 12C nucleus (Ex=7.654 MeV, 0+) is required to calculate the rate at which carbon is forged in typical red-giant stars. ...This paper reports on a new almost background-free measurement of the radiative decay branching ratio of the Hoyle state using advanced charged particle coincidence techniques. The exploitation, for the first time in a similar experiment, of a bidimensional map of the coincidence efficiency allows to reach an unitary value and, consequently, to strongly reduce sources of systematic uncertainties. The present results suggest a value of the radiative branching ratio of Γrad/Γtot=4.4(6)·10-4. This finding helps to resolve the tension between recent data published in the literature.
Abstract
We investigate medium-energy angular distribution data of proton elastic scattering on
12
C, with the aim to probe the existence of cluster distributions in the ground state of
12
C. In our ...approach, we exploit Coupled-channel calculations to describe the scattering from a spheroidal-like structure, and we include a further contribution, based on a diffraction scattering formula, to explicitly take into account a possible triangular
α
-cluster structure of the target. From the present analysis, we find a quite small cluster component in
12
C ground state (with an upper limit on the occurrence probability of 1%, 99.75% confidence level) and an inter-cluster distance of ≃3.9 fm. These values are compared with several theoretical predictions reported in the literature.
O movimento do acesso aberto possibilitou a via verde, referente a criação dos repositórios institucionais e consequentemente, abriu um novo canal de interação para a comunidade científica. O ...objetivo deste trabalho é identificar as produções científicas sobre as temáticas de repositórios institucionais e acesso aberto nos periódicos eletrônicos de Ciência da Informação com limite temporal de 2010 a 2020. Em termos metodológicos, esta pesquisa, caracteriza-se descritiva e quali-quantitativa, realizou-se uma análise das publicações recuperadas sobre repositórios institucionais e acesso aberto nos periódicos eletrônicos da área da Ciência da Informação, no período de 2010 a 2020 por meio da coleta de dados com os descritores “repositórios institucionais”, “repositório institucional” e “acesso aberto”, realizando um levantamento bibliográfico, a fim de aplicar o método bibliométrico nos indicadores selecionados para estudar os artigos. Os resultados mostram um total de 113 artigos científicos, sendo a região Sudeste a mais produtiva e identificou-se em três periódicos uma concentração de 66% da produção científica: InCID: Revista de Ciência da Informação, Encontros Bibli e Ciência da Informação. Conclui-se que a produção acerca dos repositórios institucionais está sendo desenvolvida positivamente, e os mesmos representam a informação em âmbito virtual e cooperam para a visibilidade da instituição que os adotam, assim como favorecem a comunicação científica.
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