3/11/2023 0 Comments Lepton green teaThe new results indicate hints of a deviation from one: the statistical significance of the result is 3.1 standard deviations, which implies a probability of around 0.1% that the data is compatible with the Standard Model predictions. In the Standard Model of particle physics, the ratio should be very close to one. The Standard Model predicts that decays involving different flavors of leptons should occur with the same probability, a feature known as lepton flavor universality that is usually measured by the ratio between the decay probabilities. The electron and the muon, together with a third particle called the tau, are types of leptons and the difference between them is referred to as flavors. The first decay involves the electron and the second the muon, another elementary particle similar to the electron but approximately 200 times heavier. The measurement made by the LHCb team compares two types of decays of beauty quarks. “It’s too early to say if this genuinely is a deviation from the Standard Model but the potential implications are such that these results are the most exciting thing I’ve done in 20 years in the field. ![]() Mitesh Patel, a physicist at Imperial College London and a member of the LHCb Collaboration. Our hearts did beat a bit faster,” said Dr. “We were actually shaking when we first looked at the results, we were that excited. Particle physicists have therefore been searching for ‘new physics’ - the new particles and interactions that can explain the Standard Model’s shortcomings. The model is unable to explain cosmological observations of the dominance of matter over antimatter, the apparent dark-matter content of the Universe, or explain the patterns seen in the interaction strengths of the particles. ![]() However, it is clear that the Standard Model is incomplete. The Standard Model of particle physics provides precise predictions for the properties and interactions of fundamental particles, which have been confirmed by numerous experiments since the inception of the model in the 1960s. If you do not want your contact details to be made available for these types of promotional offers from third party suppliers, please email stating your company name and account number or call Customer Care on 03.The decay of a B 0 meson into a K 0 and an electron-positron pair in the LHCb detector, which is used for a sensitive test of lepton universality in the Standard Model. There may be occasions where we would like to supply your contact details to certain third parties whose products are on promotion, for their salesforce or call centre to call you direct and take orders which are then transferred to us for delivery with your normal order. The product names and descriptions within this publication are not intended to constitute the full legal description of the product.įor full details please refer to the product packaging or alternatively please contact Customer Care on 03.Īll products are shown as serving suggestions. In exceptional circumstances, Brakes reserves the right to review the price of certain products prior to the end of the price freeze if there is a significant increase in the cost of sourcing the products which arises from circumstances beyond Brakes’ reasonable control. We reserve the right to substitute products subject to availability. Offers available to participating customers only. Additional agreed charges on split cases will be applied as appropriate. All unit prices are approximate and have been rounded to the nearest whole penny. ![]() Normal minimum order level conditions apply. There will be no further discount on priced promotional items. Brakes standard terms & conditions of sale apply.ĪLL OFFERS: 1.
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