Save as MODS; Export to Mendeley; Save as EndNote; Export to 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 As a Test of lepton universality in beauty-quark decays. the leptons in a special way (see g-ure on right), and refer to each lepton and its neutrino as a generation. This can be interpreted as a world-leading test of lepton flavour universality in (2S)+decays. This called lepton universality. More from Journal of High Energy Physics. Lepton universality has been confirmed in a wide range of particle decays. LHCb collaboration, Test of lepton universality in beauty-quark decays, Nature Phys. 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 L. C. R. Aaij, C. Beteta, +945 authors G. Zunica; Physics. 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. Test of lepton universality using B+ k+l+l- decays. According to the Standard Model of particle physics, particles such as beauty quarks should decay into either muons or electrons in equal measure.

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).

The U.S. Department of Energy's Office of Scientific and Technical Information Semantic Scholar profile for V. Obraztsov, with 858 highly influential citations and 1134 scientific research papers. SciPost Phys. Open navigation menu. BELLE collaboration, Test of lepton flavor universality and search for lepton flavor violation in B K decays, JHEP 03 (2021) 105 [arXiv:1908.01848] . Prepared for submission to Nature. The fit projections for the m(K++)and mJ/(K++)distributions are In the Standard Model all leptons are equal. 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 Although this may not be 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. Given the 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 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 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 We study lepton flavor violation (LFV) induced by one-loop box diagrams in Pati-Salam (PS) unification with vector-like families. [LHCb], Test of lepton universality in beauty-quark decays, [arXiv:2103.11769 [hep-ex]]. The LHCb (Large Hadron Collider beauty) experiment is one of eight particle physics detector experiments collecting data at the Large Hadron Collider at CERN. (ATLAS Collaboration). Nature Physics. Lett. Such even ts are excluded using dierent criteria for the muon and the

2014, Physical Review Letters. More information: Test of lepton universality in beauty-quark decays, LHCb explores the beauty of lepton universality. 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 Jger, S. and Martin, J. 18 (2022) 277 [arXiv:2103.11769] . 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 of particle physics encapsulates our best current understanding of physics at the smallest scales. 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. In addition to (2021). Building blocks of nature. 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 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. 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. Dark matter effective field theory and an application to vector dark A fundamental axiom of this theory is the universality of the couplings of the different generations of leptons to the electroweak gauge bosons. Title Test of lepton universality in beauty-quark decays. Test of lepton universality in beauty-quark decays (2022). Proc. Ahmad, T, et al. 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 differential branching fractions of B0 K0 See Close suggestions Search Search. The The latest LHCb result is the first test of lepton universality made using the decays of beauty baryonsthree-quark particles containing at least one beauty quark. Test of lepton universality in beauty-quark decays, arXiv:2103.1176.

decays where the k aon is mistakenly iden tied as a lepton and the lepton (of the same electric charge) as a k aon. This called lepton universality. 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. 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. en Change Language 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 (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 ISSN 1745-2473 1745-2481. Tests of lepton universality in B0 K0 S`` and B+ K+`+` decays where ` is either an electron or a muon are presented. Rev. Determination of the quark coupling strength |Vub| using baryonic decays. The discrepancies between bs+ data and the corresponding Standard Model predictions point convincingly towards the existence of new physics. by R. Le Gac. The U.S. Department of Energy's Office of Scientific and Technical Information Our most recent measurement is 3.1 sigma The results presented In the case where lepton universality is observed, the rate should equal 1. Not really, but maybe: Enhanced BD* compared to the light avors (R

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. Dark Matter abundance via thermal decays and leptoquark mediators Dark Matter abundance via thermal decays and leptoquark mediators. 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. The Internet Archive offers over 20,000,000 freely downloadable books and texts. 2022; The standard model of particle physics 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 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 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 A recent measurement of beauty-quark decays based on proton-proton collision data collected with the LHCb detector While limited in statistical sensitivity, the results fit 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 Pagina-navigatie: Main; Save publication. 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 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. Measurements of the ratios of muon to electron decays by LHCb (purple) and previous measurements from Belle (red). This can be interpreted as a world-leading test of lepton flavour universality in (2 S ) + decays. WikiZero zgr Ansiklopedi - Wikipedia Okumann En Kolay Yolu June 12, 2017 nations of this apparent violation of lepton universality for decays. Probing the Standard Model of particle physics with rare beauty decays. Large Hadron Collider-beauty collaboration. There is also a collection of 2.3 million modern eBooks that may be borrowed by anyone with a free archive.org account. 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. Thermodynamics of BPS and near-BPS AdS6 black holes Thermodynamics of BPS and near-BPS AdS6 black holes. - decays to test lepton flavor universality and search for lepton flavor violation. In particular, a heavy neutral gauge boson (Z) is a prime candidate for explaining these tensions. for Lepton universality is the idea that all three types of charged lepton particleselectrons, muons and tausinteract in the same way with other particles. The generations are ordered by the masses of the charged leptons. 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. LHCb is a specialized b Check out the new paper Test of lepton universality in beauty-quark decays published as a preprint. The measurement of the ratio of the decay rate of W bosons to leptons and muons, R(/), constitutes an important test of 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. Semantic Scholar profile for B. Leverington, with 762 highly influential citations and 1202 scientific research papers. By isolating and counting Source: Phys. 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. Test of lepton universality using B+ k+l+l- decays Academia.edu uses cookies to personalize content, tailor ads and improve the user experience. * (LHCb Collaboration) (Received 25 June 2014; published 6 October 2014) Ameasurement of the ratio of the branching

(2016). ing quark-lepton transitions is shown in Figure 7 Measurements performed by the team working at the LHCb experiment obtained the following value: 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.

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 Jan 20, 2020. Publisher Berlin, NATURE PORTFOLIO. The standard model describes nature on the smallest of scales, comprising fundamental particles known as leptons (such as electrons) and quarks (which can come _____ G. Aad et al. Tags cosmos einstein large hadron collider particle physics physics 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 Reassessing the 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. This expectation has been tested many times; for instance, the probability that a negatively charged W particle decays to an electron plus an LEPTON FLAVOR UNIVERSALITY AND TOP DECAYS Have we ever seen breakdown of lepton flavor universality? Test of Lepton Universality Using B Kll Decays R. Aaij et al.