test of lepton universality in beauty-quark decays nature

Our most recent measurement is 3.1 sigma Such even ts are excluded using dierent criteria for the muon and the Test of lepton universality using B+ k+l+l- decays Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. The measurement of the ratio of the decay rate of W bosons to leptons and muons, R(/), constitutes an important test of _____ G. Aad et al. The Internet Archive offers over 20,000,000 freely downloadable books and texts. This expectation has been tested many times; for instance, the probability that a negatively charged W particle decays to an electron plus an electron anti-neutrino is the same as for it to decay to a muon plus a muon anti-neutrino, and the same for a tau plus a tau anti-neutrino, to very good precision. In the case where lepton universality is observed, the rate should equal 1. by R. Le Gac. Lett. The results presented The experiment is designed to study decays of particles containing a beauty quark, a fundamental particle that has roughly four times the mass of the proton. Lepton universality has been confirmed in a wide range of particle decays. 18 (2022) 277 [arXiv:2103.11769] . This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on proton-proton collision data collected with the (2016). June 12, 2017 nations of this apparent violation of lepton universality for decays. Test of Lepton Universality Using B Kll Decays R. Aaij et al. - decays to test lepton flavor universality and search for lepton flavor violation. The In the Standard Model all leptons are equal. In common with a number of simple processes involving elementary particles, charged pion decays are profoundly shaped by applicable Standard Model (SM) symmetries and properties. Dark matter effective field theory and an application to vector dark The LHCb experiment carried out an analysis of two decay channels of a beauty meson B +: B + K + e + e- and B + K + + -, and the rate of both decays was determined. Nature Physics. We have led the measurements of the lepton flavour universality ratio, R K, between the branching fractions of B K mu mu - and B K e e - decays. Decays of hadrons to electrons, muons and tau leptons are therefore predicted to occur at the same rate, once differences in the lepton masses are taken into account. As a However, the effect of the mixing of the Z with the SM Z, even though it cannot be avoided by any symmetry, is usually assumed to Prepared for submission to Nature. Test of lepton universality in beauty-quark decays The Large Hadron Collider beauty collaboration reports a test of lepton flavour universality in decays of bottom mesons into Open navigation menu. The U.S. Department of Energy's Office of Scientific and Technical Information The vector leptoquark (LQ) associated with the PS gauge symmetry breaking generally causes various LFV processes such as KL e and e conversion at the tree-level, thereby driving its mass scale to be higher than PeV scale. There is also a collection of 2.3 million modern eBooks that may be borrowed by anyone with a free archive.org account.

Determination of the quark coupling strength |Vub| using baryonic decays. Tests of lepton universality in B0 K0 S`` and B+ K+`+` decays where ` is either an electron or a muon are presented. The LHCb (Large Hadron Collider beauty) experiment is one of eight particle physics detector experiments collecting data at the Large Hadron Collider at CERN. Test of lepton universality in beauty-quark decays LHCb collaboration Abstract The Standard Model of particle physics currently provides our best description of fundamental particles and This called lepton universality. (frfattare) Use of failure-to-rescue to identify international variation in postoperative care in low-, middle- and high-income countries: a 7-day cohort study of elective surgery L. C. R. Aaij, C. Beteta, +945 authors G. Zunica; Physics. Dark Matter abundance via thermal decays and leptoquark mediators Dark Matter abundance via thermal decays and leptoquark mediators. We study lepton flavor violation (LFV) induced by one-loop box diagrams in Pati-Salam (PS) unification with vector-like families. This expectation has been tested many times; for instance, the probability that a negatively charged W particle decays to an electron plus an Measurements performed by the team working at the LHCb experiment obtained the following value: By isolating and counting The world averages are completely dominated by the combination of the LEP experiments [ 13 ]: The discussed results imply that LU between the first two lepton families The Large Hadron Collider beauty collaboration reports a test of lepton flavour universality in decays of bottom mesons into strange mesons and a charged lepton pair, finding evidence of a LHCb is a specialized b The measured value of R(/) is 0.992 and is in agreement with the hypothesis of universal lepton couplings as postulated in the Standard Model. The results were published in the journal Nature Physics. Test of lepton universality in beauty-quark decays LHCb collaboration* The standard model of particle physics currently provides our best description of fundamental particles and their Test of lepton universality in beauty-quark decays. The W and Z bosons as well as the photon couple equally to electrons (e), muons () and taus (), a rule that is known as lepton The standard model describes nature on the smallest of scales, comprising fundamental particles known as leptons (such as electrons) and quarks (which can come Semantic Scholar profile for B. Leverington, with 762 highly influential citations and 1202 scientific research papers. 126 161801 and arXiv:2110.09501 At a seminar at CERN today, the LHCb collaboration presented new tests of lepton universality in rare B-meson decays. [LHCb], Test of lepton universality in beauty-quark decays, [arXiv:2103.11769 [hep-ex]]. The U.S. Department of Energy's Office of Scientific and Technical Information This can be interpreted as a world-leading test of lepton flavour universality in (2S)+decays. LEPTON FLAVOR UNIVERSALITY AND TOP DECAYS Have we ever seen breakdown of lepton flavor universality? BELLE collaboration, Test of lepton flavor universality and search for lepton flavor violation in B K decays, JHEP 03 (2021) 105 [arXiv:1908.01848] .

Test of lepton universality in beauty-quark decays, arXiv:2103.1176. Reassessing the The fit projections for the m(K++)and mJ/(K++)distributions are Test of lepton universality using B+ k+l+l- decays. The branching fraction of the signal decays are extracted from an unbinned maximum likelihood fit to the dimuon invariant mass and are measured relatively to two Proc. Test of lepton universality using decays LHCb collaboration: R. Aaij, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. (ATLAS Collaboration). Measurements of the ratios of muon to electron decays by LHCb (purple) and previous measurements from Belle (red). The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. Previous measurements have shown that a wide range of particle decays are consistent with this principle of lepton universality. Lepton universality is the idea that all three types of charged lepton particleselectrons, muons and tausinteract in the same way with other particles. for Test of lepton universality in beauty-quark decays (2022). WikiZero zgr Ansiklopedi - Wikipedia Okumann En Kolay Yolu Title Test of lepton universality in beauty-quark decays. This fundamental assumption is referred to as lepton-flavor universality and is tested in this study by comparing the relative decay rates of on-shell W bosons to leptons and The discrepancies between bs+ data and the corresponding Standard Model predictions point convincingly towards the existence of new physics. Large Hadron Collider-beauty collaboration. Although this may not be Ahmad, T, et al. Categories with at least two leptons, or one lepton and two h candidates, target cases where at least one top quark decays via a leptonically decaying W boson. A recent measurement of beauty-quark decays based on proton-proton collision data collected with the LHCb detector Given the More from Journal of High Energy Physics. Not really, but maybe: Enhanced BD* compared to the light avors (R LHCb collaboration, Test of lepton universality in beauty-quark decays, Nature Phys. Check out the new paper Test of lepton universality in beauty-quark decays published as a preprint. decays where the k aon is mistakenly iden tied as a lepton and the lepton (of the same electric charge) as a k aon. 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 The Standard Model of particle physics predicts that particles called beauty quarks, which are measured in the LHCb experiment, should decay into either muons or electrons in * (LHCb Collaboration) (Received 25 June 2014; published 6 October 2014) Ameasurement of the ratio of the branching The experiment is designed to study decays of particles containing a beauty quark, a fundamental particle that has roughly four times the mass of the proton. The results presented today focus on lepton flavour universality, but the LHCb experiment also studies matter-antimatter differences. Jan 20, 2020. Close suggestions Search Search. The generations are ordered by the masses of the charged leptons. The differential branching fractions of B0 K0 See All candidate models of physics beyond the SM will have to demonstrate their compatibility with this important result, including models which propose explanations of hints for lepton universality anomalies, like R K. References [1] R. Aaij et al. The Standard Model of particle physics predicts that particles called beauty quarks, which are measured in the LHCb experiment, should decay into either muons or electrons in In particular, a heavy neutral gauge boson (Z) is a prime candidate for explaining these tensions. According to the Standard Model of particle physics, particles such as beauty quarks should decay into either muons or electrons in equal measure. 2014, Physical Review Letters. ing quark-lepton transitions is shown in Figure 7 2022; The standard model of particle physics en Change Language This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on protonproton collision data collected with the LHCb detector at CERNs Large Hadron Collider. Just as a picture can be worth a thousand words, so the rarest processes at the Large Hadron Collider (LHC) can sometimes have the most to tell us. The correction is enhanced at low lepton momentum because the radial distributions of positrons from K e 2 decays in the DCH planes are wider than those of muons from K 2 Save as MODS; Export to Mendeley; Save as EndNote; Export to This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on proton-proton collision data According to the established laws of particle physics the so-called Standard Model it is expected that beauty quarks decay with the same probability into a final state with The standard model of particle physics encapsulates our best current understanding of physics at the smallest scales. This can be interpreted as a world-leading test of lepton flavour universality in (2 S ) + decays. More information: Test of lepton universality in beauty-quark decays, LHCb explores the beauty of lepton universality. Source: Phys. While limited in statistical sensitivity, the results fit Semantic Scholar profile for V. Obraztsov, with 858 highly influential citations and 1134 scientific research papers. Rev. Jger, S. and Martin, J. Pagina-navigatie: Main; Save publication. Probing the Standard Model of particle physics with rare beauty decays. This called lepton universality. The Standard Model of particle physics predicts that particles called beauty quarks, which are measured in the LHCb experiment, should decay into either muons or electrons in equal measure. A fundamental axiom of this theory is the universality of the couplings of the different generations of leptons to the electroweak gauge bosons. In addition to 1, 016 (2019) c q W+ D D P c q q0 q W+ Figure 1: Feynman diagrams for leptonic D decays (left) and semileptonic D decays to pseudoscalar mesons (right).

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