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Search for hidden particles: exploring the high intensity frontier

English title Search for hidden particles: exploring the high intensity frontier
Applicant Serra Nicola
Number 155990
Funding scheme Temporary Backup Schemes
Research institution Physik-Institut Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Particle Physics
Start/End 01.01.2016 - 31.12.2020
Approved amount 1'499'607.00
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Keywords (7)

New Physics; Long Lived Particles; Secluded Sector; Majorana neutrinos; LHCb upgrade; Charm meson decays; Fixed target experiment

Lay Summary (Italian)

Lead
Il Modello Standard della fisica delle particelle descrive le particelle elementari e le loro interazioni, inoltre gioca un ruolo fondamentale nella descrizione dell’evoluzione dell’Universo. Tuttavia, esistono problemi aperti in cui il Modello Standard fallisce. Il primo è l’esistenza della materia oscura, di cui esistono numerose evidenze astronomiche. Non esiste alcuna particella del Modello Standard che possa essere identificata con la materia oscura. Inoltre, il Modelllo Standard non spiega il meccanismo con cui la materia abbia prevalso sull’antimateria nell’universo primordiale, rendendo così possibile la formazione di galassie composte essenzialmente da materia.
Lay summary

Recentemente, è stato ipotizzato che questi due problemi siano correlati con il fenomeno delle oscillazioni dei neutrini, per la cui scoperta nel 2015 è stato assegnato assegnato il premio Nobel per la fisica a T. Kajita e A.B. McDonald.

Questo scoperta sembrerebbe suggerire l’esista di un particolare tipo di neutrino, detto neutrino di Majorana. Aggiungendo al Modello Standard tre neutrini di Majorana, uno per ogni neutrino del Modello Standard, sarebbe possibile spiegare sia l’osservata asimmetria tra materia ed antimateria nell’Universo che l’esistenza della materia oscura. Inoltre, queste particelle avrebbero la proprietà di rendere i neutrini del Modello Standard molto più leggeri delle altre particelle, come viene osservato sperimentalmente.

I neutrini di Majorana interagirebbero molto flebilmente, essendo quindi molto difficili da rivelare. In generale, esistono molti modelli che tentano di spiegare l’esistenza della materia oscura invocando l’esistenza di particelle molto debolmente interagenti.

Propongo di cercare queste particelle nell’upgrade dell’esperimento LHCb al Large Hadron Collider del CERN ed in particolare all’esperimento SHiP. Quest’ultimo è la proposta di un nuovo esperimento al CERN di Ginevra, di cui sono uno dei principali proponenti.

 

Direct link to Lay Summary Last update: 08.12.2015

Lay Summary (English)

Lead
The Standard Model of particle physics describes elementary particles and their interactions. In addition, it plays a key role in the understanding of the evolution of the early Universe. However, there exist open problems in cosmology and particle physics that the Standard Model fails to explain. The first is the existence of Dark Matter, which is evident from several astronomical observations. In the Standard Model there is no particle which can play the role of Dark Matter. In addition, the Standard Model does not explain how matter in the early Universe prevailed on anti-matter, making possible the existence of galaxy, which consist of matter.
Lay summary

Recently, it was suggested that the two main problems of the Standard Model could be related to the phenomenon of neutrino oscillations, which discovery led to the Nobel prize for physics in 2015 given to T. Kajita and A. B. McDonald. This discovery seems to suggest the existence of particular kind of neutrinos known as Majorana neutrinos, which are not present in the Standard Model. Adding three Majorana neutrinos to the Standard Model particles, one for each of the Standard Model neutrinos, can explain the asymmetry between matter and anti-matter in the Universe and the existence of Dark Matter. In addition, these new particles would explain the reason why Standard Model neutrinos are much lighter than other matter particles. Majorana neutrinos would interact very weakly, and they are therefore very difficult to detect. In addition, many other models that explain Dark Matter by postulating the existence of very weakly interacting particles have been proposed in recent years. In this project I propose to search for these particles at the upgrade of the LHCb experiment, at the Large Hadron Collider of CERN and at the newly proposed SHiP experiment, of which I am one of the main proponents. 

  

 

 

Direct link to Lay Summary Last update: 08.12.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Application of large area SiPMs for the readout of a plastic scintillator based timing detector
Betancourt Christopher et al. (2017), Application of large area SiPMs for the readout of a plastic scintillator based timing detector, in JINST, 12, 11023.
Flavour changing neutral currents making and breaking the Standard Model
Archilli Flavio, Bettler Marc Olivier, Owen Patrick, Petridis Konstantinos (2017), Flavour changing neutral currents making and breaking the Standard Model, in Nature, 546,, 221-226.
Measurement of the phase difference between the short- and long-distance contributions to B+ → K+μ+μ− decays
Aaij Roel et al. LHCb Collaboration (2017), Measurement of the phase difference between the short- and long-distance contributions to B+ → K+μ+μ− decays, in Eur. Phys. J. C, 77, 161.
Observation of the suppressed decay Λ0b → pπ−μ+μ−
Aaij Roel et al LHCb Collaboration (2017), Observation of the suppressed decay Λ0b → pπ−μ+μ−, in JHEP, 04, 029.
Signal coupling to embedded pitch adapters in silicon sensors
M. Artuso et al. (2017), Signal coupling to embedded pitch adapters in silicon sensors, in Nuclear Instruments and Methods in Physics Research Section, A, 877.
SiPM readout for the SHiP timing detector
Betancourt Christopher et al. (2017), SiPM readout for the SHiP timing detector, in JINST, 12, 02058.
The active muon shield in the SHiP experiment
Akmete A. et al. SHiP Collaboration (2017), The active muon shield in the SHiP experiment, in JINST, 12(05), 05011.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
XXIV Cracow EPIPHANY Conference Talk given at a conference The SHiP Experiment 09.01.2018 Cracow, Poland Serra Nicola;
11th International Hiroshima Symposium on the Development and Application of Semiconductor Tracking detectors (2017) Poster A timing detector for the SHiP experiment 10.12.2017 Okinawa, Japan Betancourt Christopher;
Colloquium on Physics Landscape in 10 years Talk given at a conference The status of the SHiP Experiment 09.11.2017 CERN, Switzerland Serra Nicola;
International School "SHiP (Search for Hidden Particles) experiment" Talk given at a conference Introduction to FairShip 02.11.2017 CERN, Switzerland Bezshyiko Iaroslava;
Joint annual meeting of Swiss and Austrian Physical Societies 2017 Talk given at a conference SHiP: a new facility with a dedicated detector to search for new long-lived neutral particles 21.08.2017 CERN, Switzerland Bezshyiko Iaroslava;
Neutrino at the High Energy Frontier Talk given at a conference Future Intensity Frontier: SHiP 18.07.2017 Amherst, United States of America Serra Nicola;
Invisibles workshop, Zurich Talk given at a conference Hints of lepton universality violation in semileptonic B decays 12.06.2017 Zurich, Switzerland Owen Patrick;
Beyond the LHCb Phase-1Upgrade Talk given at a conference Prospects for SL decays with a phase-II upgrade 28.05.2017 Elba island, Italy Owen Patrick;
Aspen winter conference Talk given at a conference Heavy flavour physics at LHCb 19.05.2017 Aspen, United States of America Owen Patrick;
12th Trento Workshop on Advanced Silicon Radiation Detectors (2017) Talk given at a conference Development of the SHiP Timing Detector Based on Scintillating Bars Readout by SiPMs 20.02.2017 Trento, Italy Betancourt Christopher;
Zurich Phenomenology Workshop Talk given at a conference Flavour Anomalies: Status and prospects for the Run2 of LHCb 09.01.2017 Zurich, Switzerland Serra Nicola;
IEEE 2016 NSSMIC Talk given at a conference The SHiP Experiment at CERN 29.10.2016 Strasbourg, France Betancourt Christopher;
14th Topical Seminar on Inno- vative Particle and Radiation Detectors (2016) Talk given at a conference SiPM readout for the SHiP timing detector 03.10.2016 Siena, Italy Betancourt Christopher;
Heavy Flavour physics at HL-LHC Talk given at a conference Rare B decays in the HL-LHC era 31.08.2016 CERN, Switzerland Owen Patrick;
Physics Seminar Individual talk Searching for New Particles at high and low energies 20.02.2016 University of Santiago De Compostela, Spain Serra Nicola;


Self-organised

Title Date Place
SHiP/Hidden Sector workshop, LPNHE 11.12.2017 Paris, France
12th SHiP Collaboration meeting 08.11.2017 CERN, Switzerland
Invisibles17 Workshop 12.06.2017 Zurich, Switzerland
11th SHiP Collaboration meeting 07.06.2017 CERN, Switzerland
10th SHiP Collaboration meeting 08.02.2017 University of Berlin, Germany
9th SHiP Collaboration meeting 23.11.2016 CERN, Switzerland
8th SHiP Collaboration meeting, London, 13-15 June, 2016 13.06.2016 Imperial College London, Great Britain and Northern Ireland
7th SHiP Collaboration meeting 10.02.2016 CERN, Switzerland

Associated projects

Number Title Start Funding scheme
144674 Rare decays of B-mesons and the physics of the early Universe 01.07.2013 SNSF Professorships
173580 FLARE 2017-2020: Operation and upgrade of the LHCb experiment 01.04.2017 FLARE
154217 FLARE: Maintenance & Operation for the LHC Experiments 2014 01.04.2014 FLARE
185050 High Precision Flavour Physics at LHCb 01.04.2019 Project funding (Div. I-III)

Abstract

The Standard Model of particle physics describes all known microscopic phenomena with great precision. However, it is not considered a complete theory of fundamental interactions. The main experimental evidences of the failure of the Standard Model are: the existence of Dark Matter and the matter-antimatter asymmetry in the Universe.For these reasons the search for new particles, that might complete the Standard Model and solve its problems, has been one of the main area of research in particle physics in the last decades. This is also one of the main goals of the LHC experiments. However, up to this moment there is not yet a microscopic evidence of the existence of such new particles. In particular, the recent discovery of a Higgs-like boson with a mass of about 125 GeV can be interpreted as a strong confirmation of the Standard Model.It is possible that new particles couple too weakly with Standard Model particles and therefore escape detection. This would imply that these new particles should be searched for at the high intensity frontier rather than at the high energy frontier.I propose to search for these particles at two complementary facilities: the SHIP experiment and the LHCb upgrade. The SHIP experiment is a new fixed-target experiment at the Super Proton Synchrotron (SPS) of CERN, which would offer the unique possibility to open up a new window in the search for hidden particles with long lifetimes. The applicant is one of the initiators of this experiment and he is responsible for sensitivity studies to the different models with long living particles. Here, I propose to further optimise the facility and extend the physics case of the SHIP experiment. I propose to search for hidden particle with shorter lifetime at the LHCb upgrade. To fully exploit the LHCb upgrade potential, dedicated reconstruction, trigger and selection algorithms for long living particles will be developed.This approach is novel in its scope and in its methods and it can have a large impact on the field of particle physics. Given the present experimental status and the foreseen upgrade of SPS and LHCb this is the ideal time to pursue this project.
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