T Chen / B Yu (@1.66) vs G Loffhagen / A Rai (@2.1)
06-09-2019

Our Prediction:

T Chen / B Yu will win
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T Chen / B Yu – G Loffhagen / A Rai Match Prediction | 06-09-2019 02:00

The SM point is shown as the (red) square located, by construction, at . b, c, Variations of the test statistic 2lnL for and are shown in b and c, respectively. The dark and light (cyan) areas define the 1 and 2 confidence intervals, respectively. a, The (black) cross marks the central value returned by the fit. The SM is represented by the (red) vertical lines. The SM branching fractions are assumed uncorrelated to each other, and their uncertainties are accounted for in the likelihood contours. Each contour encloses a region approximately corresponding to the reported confidence level.

Individual groups or members of the LHCb collaboration have received support from EPLANET, Marie Skodowska-Curie Actions and ERC (European Union), Conseil gnral de Haute-Savoie, Labex ENIGMASS and OCEVU, Rgion Auvergne (France), RFBR (Russia), XuntaGal and GENCAT (Spain), Royal Society and Royal Commission for the Exhibition of 1851 (UK). The following agencies provide support for both CMS and LHCb: CAPES, CNPq, FAPERJ and FINEP (Brazil); NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and HGF (Germany); SFI (Ireland); INFN (Italy); NASU (Ukraine); STFC (UK); and NSF (USA). P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Federal Science Policy Office; the Fonds pour la Formation la Recherche dans lIndustrie et dans lAgriculture (FRIABelgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Science and Industrial Research, India; the HOMING PLUS programme of Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the Compagnia di San Paolo (Torino); the Consorzio per la Fisica (Trieste); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofinanced by EU-ESF and the Greek NSRF; and the National Priorities Research Program by Qatar National Research Fund. Agencies that provide support for only LHCb are: FINEP (Brazil); MPG (Germany); FOM and NWO (The Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MinES and FANO (Russia); MinECo (Spain); SNSF and SER (Switzerland). Finally, we acknowledge the enduring support for the construction and operation of the LHC, the CMS and the LHCb detectors provided by CERN and by many funding agencies. Agencies that provide support for CMS only are BMWFW and FWF (Austria); FNRS and FWO (Belgium); FAPESP (Brazil); MES (Bulgaria); CAS and MoST (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA (France); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); NRF and WCU (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); SFFR (Ukraine); and DOE (USA). We express our gratitude to colleagues in the CERN accelerator departments for the excellent performance of the LHC. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. The CMS and LHCb collaborations are indebted to the communities behind the multiple open source software packages on which they depend. LHCb is also thankful for the computing resources and the access to software R&D tools provided by Yandex LLC (Russia). We thank the technical and administrative staff at CERN, at the CMS institutes and at the LHCb institutes. Individuals from the CMS collaboration have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A.

Corresponding authors

The categories are defined by the range of BDT values for LHCb, and for CMS, by centre-of-mass energy, by the region of the detector in which the muons are detected, and by the range of BDT values. Categories for which both muons are detected in the central region of the CMS detector are denoted with CR, those for which at least one muon was detected into the forward region with FR. Superimposed on the data points in black are the combined fit (solid blue) and its components: the (yellow shaded) and B0 (light-blue shaded) signal components; the combinatorial background (dash-dotted green); the sum of the semi-leptonic backgrounds (dotted salmon); and the peaking backgrounds (dashed violet).

The latter numbers are the raw results of this analysis, whereas the former need to be determined from measurements of one or more normalization decay channels, which are abundantly produced, have an absolute branching fraction that is already known with good precision, and that share characteristics with the signals, so that their trigger and selection efficiencies do not differ significantly. Both branching fraction values are taken from ref. Both experiments use the B+J/K+ decay as a normalization channel with (B+J/ (+) K+) = (6.10 0.19) 105, and LHCb also uses the B0K+ channel with (B0K+) = (1.96 0.05) 105. 14. To compute the signal branching fractions, the numbers of and B0 mesons that are produced, as well as the numbers of those that have decayed into a dimuon pair, are needed.

Small changes are made to the analysis procedure with respect to refs 18, 19 in order to achieve a consistent combination between the two experiments. The following modifications are made to the CMS analysis: the branching fraction is updated to a more recent prediction63, 64 of ; the phase space model of the decay is changed to a more appropriate semi-leptonic decay model63; and the decay time bias correction for the , previously absent from the analysis, is now calculated and applied with a different correction for each category of the multivariate discriminant. In the LHCb analysis, the background component, which was not included in the fit for the previous result but whose effect was accounted for as an additional systematic uncertainty, is now included in the standard fit.

B Mousley/R Purcell vs T Chen/B Yu Live Center

Markers without error bars denote upper limits on the branching fractions at 90% confidence level, while measurements are denoted with error bars delimiting 68% confidence intervals. The solid horizontal lines represent the SM predictions for the and B0+ branching fractions1; the blue (red) lines and markers relate to the (B0+) decay. Data (see key) are from refs 17, 18, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60; for details see Methods. Inset, magnified view of the last period in time.

Owing to the smaller difference between the lifetime of its heavy and light mass eigenstates, no correction is required for the B0 decay mode. In the SM, the heavy eigenstate can decay into two muons, whereas the light eigenstate cannot without violating the CP quantum number conservation. This superposition can be described by two mass eigenstates, which are symmetric and antisymmetric in the charge-parity (CP) quantum number, and have slightly different masses. However, the B0 and particles are known to oscillate, that is to transform continuously into their antiparticles and vice versa. Therefore, a quantum superposition of particle and antiparticle states propagates in the laboratory before decaying. The lifetimes of the light and heavy eigenstates are also different from the average lifetime, which is used by CMS and LHCb in the simulations of signal decays. This bias is estimated assuming SM dynamics. In BSM models, this is not necessarily the case. In addition to their masses, the two eigenstates of the system also differ in their lifetime values14. The antiparticle and the particle B0 () can both decay into two muons and no attempt is made in this analysis to determine whether the antiparticle or particle was produced (untagged method). Since the information on the displacement of the secondary decay with respect to the PV is used as a discriminant against combinatorial background in the analysis, the efficiency versus lifetime has a model-dependent bias62 that must be removed.

The protonproton collision occurs on the left-hand side, at the origin of the trajectories depicted with the orange curves. The red curves represent the trajectories of the muons from the candidate decay. 21 for details. a, The LHCb detector and its components; see ref. b, A candidate decay produced in protonproton collisions at 7 TeV in 2011 and recorded in the LHCb detector.

Live Match

Superimposed on the data points in black are thecombined full fit (solid blue) and its components: the (yellow shaded) and B0 (light-blue shaded) signal components; the combinatorial background(dash-dotted green); the sum of the semi-leptonic backgrounds (dotted salmon); and the peaking backgrounds (dashed violet). The mass distribution for the six highest-ranking categories, three per experiment, is shown. Categories are ranked according to values of S/(S + B) where S and B are the numbers of signal events expected assuming the SM rates and background events under the peak for a given category, respectively.

The data correspond to total integrated luminosities of 25 fb1 and 3 fb1 for the CMS and LHCb experiments, respectively, equivalent to a total of approximately 1012 and B0 mesons produced in the two experiments together. Assuming the branching fractions given by the SM and accounting for the detection efficiencies, the predicted numbers of decays to be observed in the two experiments together are about 100 for and 10 for B0+. In this Letter, the two sets of data are combined and analysed simultaneously to exploit fully the statistical power of the data and to account for the main correlations between them.

Therefore, the decay vertex, from which the muons originate, is required to be displaced with respect to the production vertex, the point where the two protons collide. The separation between genuine decays and random combinations of two muons (combinatorial background), most often from semi-leptonic decays of two different b hadrons, is achieved using the dimuon invariant mass, , and the established characteristics of -meson decays. For example, because of their lifetimes of about 1.5 ps and their production at the LHC with momenta between a few GeV/c and ~100 GeV/c, mesons travel up to a few centimetres before they decay. The experiments follow similar data analysis strategies. Decays compatible with (candidate decays) are found by combining the reconstructed trajectories (tracks) of oppositely charged particles identified as muons. Furthermore, the negative of the candidates momentum vector is required to point back to the production vertex.

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In general, CMS operates at a higher instantaneous luminosity than LHCb but has a lower efficiency for reconstructing low-mass particles, resulting in a similar sensitivity to LHCb for B0 or (denoted hereafter by ) mesons decaying into two muons. Since many of these new particles would be able todecay into b quarks and many of the SM measurements also involve b quarks, the detection of b-hadron decays was a key element in the design of CMS. The LHCb collaboration has optimized its detector to study matterantimatter asymmetries and rare decays of particles containing b quarks, aiming to detect deviations from precise SM predictions that would indicate BSM effects. These different approaches, reflected in the design of the detectors, lead to instrumentation of complementary angular regions with respect to the LHC beams, to operation at different protonproton collision rates, and to selection of b quark events with different efficiency (for experimental details, see Methods). The CMS20 and LHCb21 detectors are designed to measure SM phenomena with high precision and search for possible deviations. In addition to performing a broad range of precision tests of the SM and studying the newly-discovered Higgs boson22, 23, CMS is designed to search for and study new particles with masses from about 100 GeV/c2 to a few TeV/c2. The two collaborations use different and complementary strategies.

1b, is allowed but highly suppressed because of angular momentum considerations (helicity suppression) and because it involves transitions between quarks of different generations (CKM suppression), specifically the third and first generations of quarks. Many allowed decay modes, which typically involve charmed hadrons and other particles, have angular momentum configurations that are not helicity suppressed. All b hadrons, including the B+, and B0 mesons, decay predominantly via the transition of the b antiquark to a second generation (intermediate mass quarks) charm (c) antiquark, which is less CKM suppressed, into final states with charmed hadrons. The decay B++, represented in Fig. The B+ meson is similar to the +, except that the light d antiquark is replaced by the heavy third generation (highest mass quarks) beauty (b) antiquark, which has a charge of +1/3 and a mass of ~5GeV/c2 (about five times the mass of a proton).