H2020Индивидуална стипендия2019–2021

CharmAsymmetries · The charm of asymmetries or the asymmetries in charm (entangled edition)

„Хоризонт 2020“ — Действия „Мария Склодовска-Кюри“

Период: 2019-09-23 → 2021-09-22
Финансиране от ЕС: 212 934 €
Участници: 1
Схема: MSCA-IF-EF-ST

Линиите свързват координатора с партньорите.

Накратко на български

Частиците с чарм-кваркове се анализират, за да се открият разлики в поведението на материята и антиматерията. Това помага да се разбере защо във Вселената има повече материя, отколкото антиматерия, което е фундаментална загадка за нашето съществуване.

Този кратък обзор е генериран от изкуствен интелект

Кратко обяснение, генерирано от езиков модел по текста на CORDIS. Оригиналът е по-долу.

Резултати накратко

The charm of asymmetries or the asymmetries in charm (entangled edition)

There is an apparent excess of matter over antimatter in the Universe. To generate this imbalance, Sakharov postulated three conditions one of which is a violation of the charge-parity (CP) symmetry. The charge-parity CP operator transforms a particle into its antiparticle and reverses the spatial coordinates of the physical system: properties such as the momentum, the helicity, and the electrical charge, are mirrored under this transformation. The principle of CP symmetry states that all processes must remain unchanged under a CP operation. The violation of this symmetry (CPV) is one of the conditions required to create the observed asymmetry between matter and antimatter in our universe. Within the SM all CPV in the quark sector is encoded in a single phase in the Cabibbo-Kobayashi-Maskawa (CKM) 3, 4 quark mixing matrix. However, The SM cannot explain the scale of the observed excess of cosmic matter over antimatter in our Universe, giving a prediction too small by several orders of magnitude. This is one of the most important fundamental puzzles, closely connected to our very existence. Therefore, it is of utmost importance to look for new sources of CP asymmetry. Finding and studying new sources of matter antimatter asymmetry in particles containing charm quarks is the holy grail of this field of research and is the focus of this proposal. This proposal consists of the following objectives, of equal importance: 1. To develop a model-independent unbinned method to extract the information of the strong phase variation in every point of phase space of the D0->KSπ+π- decays using QE charm meson pair data collected by the BESIII experiment, and to apply this information to measurements of the charm mixing and CP violation at the LHCb experiment. 2. To search for direct CP violation of charm two-body decays D0 -> K*0KS and D0 -> anti-K*0KS at the LHCb experiment using the full available data sample collected during LHC Run 1 and Run 2 exploiting two different techniques.

Текст от CORDIS, на английски · Данни: CORDIS, © Европейски съюз

Цел на проекта

The study of difference between matter and antimatter (CP violation) is one of the most exciting fields at the frontier of fundamental physics research. It is driven by the question of what happened to the antimatter after the Big Bang. The mesons, particles that contain both matter and antimatter quarks are ideal laboratories for the discovery of CP violation. This proposal aims at looking for CP violation in decays of mesons containing one charm (or anti-)quark, the only type of mesons where CP violation has not yet been observed.One of the objectives is to carry out a measurement of the matter-antimatter mixing and CP violation parameters in the most sensitive charm decay mode (D0->Kspipi) using the unprecedented charm data sample collected by the LHCb experiment at CERN. To achieve maximal precision of both measurements, external input from the unique Chinese flavour factory, BESIII, is crucial. Key attributes of the decays of the D meson, the strong phases and their variation across the phase space, require the use of quantum-entangled states that are accessible at BESIII. Usually, these quantities are measured in regions of the phase space, the definition of which is inspired by a model. Wrong definition of these regions would lead to dilution of the sensitivity of these measurements. We propose to measure these quantities at every point of the phase space to maximise the precision. The second objective is to look for CP violation in the charm D0->(anti-)K*0KS decays with LHCb data ignoring time-dependent effects arising from matter-antimatter mixing. The three-body final state after an instant decay of the exited K*0 meson, K pi KS, will be studied using novel model-dependent and model independent methods, the former has been pioneered by the Manchester LHCb group, and the latter has not yet been tested. Currently, these decays have been highlighted by theorists as the most likely discovery channel for time-integrated CP violation in the charm system.

Оригинален текст от CORDIS (на английски).

Участници

THE UNIVERSITY OF MANCHESTER · ManchesterКоординаторОбединеното кралство