The first full amplitude analysis of super(B) super(+)arrowrightJ/psivarphiK super(+) with J/psiarrowrightmu super(+)mu super(?), varphiarrowrightK super(+)K super(?) decays is performed with a data ...sample of 3fb super(?1) of pp collision data collected at radicals=7 and 8 TeV with the LHCb detector. The data cannot be described by a model that contains only excited kaon states decaying into varphiK super(+), and four J/psivarphi structures are observed, each with significance over 5 standard deviations. The quantum numbers of these structures are determined with significance of at least 4 standard deviations. The lightest has mass consistent with, but width much larger than, previous measurements of the claimed X(4140) state.
The CP violation observables S and C in the decay channel B super(0)arrowrightD super(+)D super( -) are determined from a sample of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, ...collected by the LHCb experiment and corresponding to an integrated luminosity of 3fb super(-1). The observable S describes CP violation in the interference between mixing and the decay amplitude, and C parametrizes direct CP violation in the decay. The following values are obtained from a flavor-tagged, decay-time-dependent analysis: (ProQuest: Formulae and/or non-USASCII text omitted). These values provide evidence for CP violation at a significance level of 4.0 standard deviations. The phase shift due to higher-order standard model corrections is constrained to a small value of (ProQuest: Formulae and/or non-USASCII text omitted) rad.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted) The ... invariant mass distribution is investigated in order to search for possible exotic meson states. The analysis is based on a ...data sample recorded with the LHCb detector corresponding to 3fb super(-1) of pp collision data at radicals= 7 and 8 TeV. No significant excess is found, and upper limits are set on the production rate of the claimed X(5568) state within the LHCb acceptance. Upper limits are also set as a function of the mass and width of a possible exotic meson decaying to the ... final state. The same limits also apply to a possible exotic meson decaying through the chain ..., ... where the photon is excluded from the reconstructed decays.
The CP asymmetry in the mixing of Bs0 and Bs0 mesons is measured in proton-proton collision data corresponding to an integrated luminosity of 3.0 fb-1, recorded by the LHCb experiment at ...center-of-mass energies of 7 and 8 TeV. Semileptonic Bs0 and Bs0 decays are studied in the inclusive mode Dsmu+ or -nu(-)muX with the Ds mesons reconstructed in the K+K-pi final state. Correcting the observed charge asymmetry for detection and background effects, the CP asymmetry is found to be asls=(0.39+ or -0.26+ or -0.20)%, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of asls to date. It is consistent with the prediction from the standard model and will constrain new models of particle physics.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted)Amplitude models are applied to studies of resonance structure in D super(0) arrowright ... and D super(0) arrowright ... decays using ...pp collision data corresponding to an integrated luminosity of 3.0fb super(-1) collected by the LHCb experiment. Relative magnitude and phase information is determined, and coherence factors and related observables are computed for both the whole phase space and a restricted region of 100MeV/c super(2) around the K*(892) super(+ or -) resonance. Two formulations for the KpiS-wave are used, both of which give a good description of the data. The ratio of branching fractions Bernoulli(D super(0) arrowright ...)/Bernoulli(D super(0) arrowright ...) is measured to be 0.655+ or -0.004(stat)+ or -0.006(syst) over the full phase space and 0.370+ or -0.003(stat)+ or -0.012(syst) in the restricted region. A search for CP violation is performed using the amplitude models and no significant effect is found. Predictions from SU(3) flavor symmetry for K*(892)K amplitudes of different charges are compared with the amplitude model results.
The B super(+)arrowrightD super(+)K super( +)pi super(-) decay is observed in a data sample corresponding to 3.0fb super(-1) of pp collision data recorded by the LHCb experiment during 2011 and 2012. ...The signal significance is 8sigma and the branching fraction is measured to be scriptB(B super(+)arrowrightD super(+)K super(+)pi super(-))=(5.3 1+ or -0.90+ or -0.48+ or -0.35)x10 super(-6), where the uncertainties are statistical, systematic and due to the normalization mode B super(+)arrowrightD super(-)K super(+)pi super(+), respectively. The Dalitz plot appears to be dominated by broad structures. Angular distributions are exploited to search for quasi-two-body contributions from B super(+)arrowright(ProQuest : Formulae and/or non-USASCII text omitted)(2460) super(0)K super(+) and B super(+)arrowrightD super(+)K*(892) super(0) decays. No significant signals are observed and upper limits are set on their branching fractions.
We examine in detail the semi-leptonic decay \(\Lambda_b \to \Lambda_c \tau{\bar \nu}_{\tau}\), which may confirm previous hints, from the analogous \(B\) decay, of a new physics beyond the standard ...model. First of all, starting from rather general assumptions, we predict the partial width of the decay. Then we analyze the effects of five possible new physics interactions, adopting in each case five different form factors. In particular, for each term beyond the standard model, we find some constraints on the strength and phase of the coupling, which we combine with those found by other authors in analyzing the analogous semi-leptonic decays of \(B\). Our analysis involves some dimensionless quantities, substantially independent of the form factor, but which, owing to the constraints, turn out to be strongly sensitive to the kind of non-standard interaction. We also introduce a criterion thanks to which one can discriminate among the various new physics terms: the left-handed current and the two-higgs-doublet model appear privileged, with a neat preference for the former interaction. Lastly, we suggest a differential observable that could, in principle, help to distinguish between the two cases.
A full amplitude analysis of (ProQuest: Formulae and/or non-USASCII text omitted) arrowright J/psippi super(-) decays is performed with a data sample acquired with the LHCb detector from 7 and 8 TeV ...pp collisions, corresponding to an integrated luminosity of 3 fb super(-1). A significantly better description of the data is achieved when, in addition to the previously observed nucleon excitations Narrowright ppi super(-), either the P sub()c4380) super(+) and P sub()c4450) super(+)arrowright J/psip states, previously observed in (ProQuest: Formulae and/or non-USASCII text omitted) arrowright J/psipK super(-) decays, or the Z sub()c4200) super(-)arrowright J/psipi super(-) state, previously reported in B super(0)arrowright J/psiK+pi super(-) decays, or all three, are included in the amplitude models. The data support a model containing all three exotic states, with a significance of more than three standard deviations. Within uncertainties, the data are consistent with the P sub()c4380)+ and P sub()c4450) super(+) production rates expected from their previous observation taking account of Cabibbo suppression.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted) The data sample of ... arrowright J/psipK super(-) decays acquired with the LHCb detector from 7 and 8 TeV pp collisions, ...corresponding to an integrated luminosity of 3 fb super(-1), is inspected for the presence of J/psip or J/psiK super(-) contributions with minimal assumptions about K super(-)p contributions. It is demonstrated at more than nine standard deviations that ... arrowright J/psipK super(-) decays cannot be described with K super(-)p contributions alone, and that J/psip contributions play a dominant role in this incompatibility. These model-independent results support the previously obtained model-dependent evidence for ... arrowright J/psip charmonium-pentaquark states in the same data sample.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted) Violations of CPT symmetry and Lorentz invariance are searched for by studying interference effects in B super(0) mixing and in ... ...mixing. Samples of B super(0)arrowrightJ /psi.. and ...arrowrightJ/psiK+K - decays are recorded by the LHCb detector in proton-proton collisions at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb super(-1). No periodic variations of the particle-antiparticle mass differences are found, consistent with Lorentz invariance and CPT symmetry. Results are expressed in terms of the standard model extension parameter Deltaa sub(mu) with precisions of scriptO(10 super(-15)) and scriptO(10 super(-14))GeV for the B super(0) and ... systems, respectively. With no assumption on Lorentz (non)invariance, the CPT-violating parameter z in the ... system is measured for the first time and found to be scriptRe(z)=-0.022+ or -0.033+ or -0.005 and scriptIm(z)=0.004+ or -0.011+ or -0.002, where the first uncertainties are statistical and the second systematic.
![Observation of J/[psi][varp...](http://api.summon.serialssolutions.com/2.0.0/image/issn/XR4PS5YY4K/0031-9007/small "Observation of J/[psi][varphi] Structures Consistent with Exotic States from Amplitude Analysis of B super(+)[arrowright]J /[psi][varphi]K super(+) Decays")
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