68 research outputs found
Search for the doubly charmed baryon Ω cc +
Abstract: A search for the doubly charmed baryon Ωcc+ with the decay mode Ωcc+ â Îc+KâÏ+ is performed using proton-proton collision data at a centre-of-mass energy of 13 TeV collected by the LHCb experiment from 2016 to 2018, corresponding to an integrated luminosity of 5.4 fbâ1. No significant signal is observed within the invariant mass range of 3.6 to 4.0GeV/c2. Upper limits are set on the ratio R of the production cross-section times the total branching fraction of the Ωcc+ â Îc+KâÏ+ decay with respect to the Îcc++âÎc+KâÏ+Ï+ decay. Upper limits at 95% credibility level for R in the range 0.005 to 0.11 are obtained for different hypotheses on the Ωcc+ mass and lifetime in the rapidity range from 2.0 to 4.5 and transverse momentum range from 4 to 15 GeV/c
First measurement of the C P -violating phase in B s 0 â J / Ï ( â e + e - ) Ï decays
Abstract: A flavour-tagged time-dependent angular analysis of Bs0âJ/ÏÏ decays is presented where the J/Ï meson is reconstructed through its decay to an e+e- pair. The analysis uses a sample of pp collision data recorded with the LHCb experiment at centre-of-mass energies of 7 and 8\,Te V, corresponding to an integrated luminosity of 3\,fb-1. The CP-violating phase and lifetime parameters of the Bs0 system are measured to be Ïs=0.00±0.28±0.07\,rad, ÎÎs=0.115±0.045±0.011\,ps-1 and Îs=0.608±0.018±0.012\,ps-1 where the first uncertainty is statistical and the second systematic. This is the first time that CP-violating parameters are measured in the Bs0âJ/ÏÏ decay with an e+e- pair in the final state. The results are consistent with previous measurements in other channels and with the Standard Model predictions
Measurement of CP asymmetries and branching fraction ratios of Bâ decays to two charm mesons
The asymmetries of seven decays to two charm mesons are measured using data corresponding to an integrated luminosity of of proton-proton collisions collected by the LHCb experiment. Decays involving a or meson are analysed by reconstructing only the or decay products. This paper presents the first measurement of and , and the most precise measurement of the other five asymmetries. There is no evidence of violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured.The CP asymmetries of seven B decays to two charm mesons are measured using data corresponding to an integrated luminosity of 9 fb of proton-proton collisions collected by the LHCb experiment. Decays involving a D or meson are analysed by reconstructing only the D or decay products. This paper presents the first measurement of (BâD) and (BâD), and the most precise measurement of the other five CP asymmetries. There is no evidence of CP violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured.[graphic not available: see fulltext]The asymmetries of seven decays to two charm mesons are measured using data corresponding to an integrated luminosity of of proton-proton collisions collected by the LHCb experiment. Decays involving a or meson are analysed by reconstructing only the or decay products. This paper presents the first measurement of and , and the most precise measurement of the other five asymmetries. There is no evidence of violation in any of the analysed decays. Additionally, two ratios between branching fractions of selected decays are measured
Updated measurement of decay-time-dependent CP asymmetries in D-0 -> K+ K- and D-0 -> pi(+)pi(-) decays
A search for decay-time-dependent charge-parity (CP) asymmetry in D0 \u2192 K+ K 12 and D0 \u2192 \u3c0+ \u3c0 12 decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13 TeV, and corresponding to an integrated luminosity of 5.4 fb^ 121. The D0 mesons are required to originate from semileptonic decays of b hadrons, such that the charge of the muon identifies the flavor of the neutral D meson at production. The asymmetries in the effective decay widths of D0 and anti-D0 mesons are determined to be A_\u393(K+ K 12) = ( 124.3 \ub1 3.6 \ub1 0.5)
7 10^ 124 and A_\u393(\u3c0+ \u3c0 12) = (2.2 \ub1 7.0 \ub1 0.8)
7 10^ 124 , where the uncertainties are statistical and systematic, respectively. The results are consistent with CP symmetry and, when combined with previous LHCb results, yield A_\u393(K+ K 12) = ( 124.4 \ub1 2.3 \ub1 0.6)
7 10^ 124 and A_\u393(\u3c0+ \u3c0 12) = (2.5 \ub1 4.3 \ub1 0.7)
7 10^ 124
Determination of quantum numbers for several excited charmed mesons observed in B- -> D*(+)pi(-) pi(-) decays
A four-body amplitude analysis of the B â â D * + Ï â Ï â decay is performed, where fractions and relative phases of the various resonances contributing to the decay are measured. Several quasi-model-independent analyses are performed aimed at searching for the presence of new states and establishing the quantum numbers of previously observed charmed meson resonances. In particular the resonance parameters and quantum numbers are determined for the D 1 ( 2420 ) , D 1 ( 2430 ) , D 0 ( 2550 ) , D â 1 ( 2600 ) , D 2 ( 2740 ) and D â 3 ( 2750 ) states. The mixing between the D 1 ( 2420 ) and D 1 ( 2430 ) resonances is studied and the mixing parameters are measured. The dataset corresponds to an integrated luminosity of 4.7 â â fb â 1 , collected in proton-proton collisions at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector
Updated measurement of decay-time-dependent CP asymmetries in D-0 -> K+ K- and D-0 -> pi(+)pi(-) decays
A search for decay-time-dependent charge-parity (CP) asymmetry in D-0 -> K+ K- and D-0 -> pi(+)pi(-) eff decays is performed at the LHCb experiment using proton-proton collision data recorded at a center-of-mass energy of 13 TeV, and corresponding to an integrated luminosity of 5.4 fb(-1). The D-0 mesons are required to originate from semileptonic decays of b hadrons, such that the charge of the muon identifies the flavor of the neutral D meson at production. The asymmetries in the effective decay widths of D-0 and (D) over bar (0) mesons are determined to be A(Gamma)(K+ K-) = (-4.3 +/- 3.6 +/- 0.5) x 10(-4) and A(Gamma) (K+ K- ) = (2.2 +/- 7.0 +/- 0.8) x 10(-4), where the uncertainties are statistical and systematic, respectively. The results are consistent with CP symmetry and, when combined with previous LHCb results, yield A(Gamma) (K+ K-) = (-4.4 +/- 2.3 +/- 0.6) x 10(-4) and A(Gamma) (pi(+)pi(-))= (2.5 +/- 4.3 +/- 0.7) x 10(-4)
Study of the lineshape of the chi(c1) (3872) state
A study of the lineshape of the chi(c1) (3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb(-1) collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate chi(c1)(3872) and psi(2S) mesons from b-hadron decays are selected in the J/psi pi(+)pi(-) decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the chi(c1 )(3872) and psi(2S) states, Delta m, and the width of the chi(c1 )(3872) state, Gamma(Bw), are determined to be (Delta m=185.598 +/- 0.067 +/- 0.068 Mev,)(Gamma BW=1.39 +/- 0.24 +/- 0.10 Mev,) where the first uncertainty is statistical and the second systematic. Using a Flatte-inspired model, the mode and full width at half maximum of the lineshape are determined to be (mode=3871.69+0.00+0.05 MeV.)(FWHM=0.22-0.04+0.13+0.07+0.11-0.06-0.13 MeV, ) An investigation of the analytic structure of the Flatte amplitude reveals a pole structure, which is compatible with a quasibound D-0(D) over bar*(0) state but a quasivirtual state is still allowed at the level of 2 standard deviations
Measurement of the CKM angle in and decays with
A measurement of -violating observables is performed using the decays
and , where the meson is
reconstructed in one of the self-conjugate three-body final states and (commonly denoted ). The decays are analysed in bins of the -decay phase space, leading
to a measurement that is independent of the modelling of the -decay
amplitude. The observables are interpreted in terms of the CKM angle .
Using a data sample corresponding to an integrated luminosity of
collected in proton-proton collisions at centre-of-mass
energies of , , and with the LHCb experiment,
is measured to be . The hadronic
parameters , , , and ,
which are the ratios and strong-phase differences of the suppressed and
favoured decays, are also reported
Programmable Release of Multiple Protein Drugs from Aptamer-Functionalized Hydrogels via Nucleic Acid Hybridization
Polymeric delivery systems have been extensively studied
to achieve
localized and controlled release of protein drugs. However, it is
still challenging to control the release of multiple protein drugs
in distinct stages according to the progress of disease or treatment.
This study successfully demonstrates that multiple protein drugs can
be released from aptamer-functionalized hydrogels with adjustable
release rates at predetermined time points using complementary sequences
(CSs) as biomolecular triggers. Because both aptamerâprotein
interactions and aptamerâCS hybridization are sequence-specific,
aptamer-functionalized hydrogels constitute a promising polymeric
delivery system for the programmable release of multiple protein drugs
to treat complex human diseases
Improving browser-based UI test automation : Konecranes case study
Technical improvement is continuous in software development. Test automation is a trending modern quality assurance procedure. Automated testing focused on web application user interfaces has always been subject to maintainability challenges. Unpredicted changes are commonly causing complications to test automation relevance. The unpredictability of these changes is usually related to multiphasing within software development processes. This occurs especially in big IT1 organizations. This thesis was inspired by test automation project management work at Konecranes Global Oy.
The thesis is based on observing software development process model change (from waterfall to kanban) from the test automation perspective. During the period of research, study was focused on finding any possible improvements aside from identifying model transition effects on the automation.
The thesis discussion starts with laying groundwork for comprehending the manifold test automation structure while also explaining how it co-operates with the target software and its development process. The development processes are described in detail to give the reader a proper test automation perspective for the process model transition.
Next the observation period is analyzed and identified improvements are expounded. Results explicate important technical findings to improve the automated testing of the target software. Dynamicity of the test data is found to be an important factor for shortening release related test automation adjustment process. Shortening the adjustment process increases test automation quality in terms of maintenance. Kanban made it easier to track development phases. This stabilized maintainability of test automation.
The study raised a major improvement idea for enhancing the test automation scripting process. Idea behind the enhancement is to implement the grey-box testing method to the scripting process.Tekninen parannus on jatkuvaa ohjelmistokehityksessÀ. Testiautomaatio on trendikÀs ja moderni laadunvarmistusprosessi. Web-applikaatioiden kÀyttöliittymiin keskittyvÀ testiautomaatio on aina ollut altis yllÀpitoon liittyville haasteille. Arvaamattomat muutokset aiheuttavat usein vaikeuksia testiautomaation relevanttiudelle. Muutosten ennalta-arvaamattomuus liittyy yleensÀ ohjelmiston kehittÀmisen monivaiheisuuteen. TÀmÀ ilmenee etenkin suurissa IT-organisaatiossa. TÀmÀn tutkielman innoitti testiautomaatioprojektin yllÀpitotyö Konecranes Global Oy:llÀ.
Tutkielma perustuu ohjelmistotuotantomallin muutoksen (vesiputousmallista kanbaniin) tarkkailuun testiautomaation nÀkökulmasta. Tutkimuksella pyrittiin löytÀmÀÀn testiautomaation parannusmahdollisuuksia ja tunnistamaan tuotantomallin muutoksen vaikutuksia testiautomaatioon.
Tutkielman kÀsitellÀÀn perusta moniosaisen testiautomaatiorakenteen ymmÀrtÀmiseksi. Samalla selitetÀÀn kuinka testiautomaatio toimii yhteistyössÀ kohdeohjelmiston ja sen tuotantoprosessin kanssa. Tuotantoprosessit kuvaillaan yksityiskohtaisesti, jotta lukija saisi kunnollisen testiautomaation nÀkökulman tuotantomallien muutokseen.
Seuraavaksi tarkkailujakso analysoidaan ja havaitut kehitysideat tuodaan esille. Tuloksissa selitetÀÀn tÀrkeÀt tekniset löydöt kohdeohjelmiston testiautomaation kehitystÀ varten. Dynaamisen testidatan huomattiin olevan merkittÀvÀ tekijÀ julkaisuihin liittyvÀn testiautomaation sopeuttamisen nopeuttamiseksi. Sopeuttamisen nopeuttaminen parantaa testiautomaation laatua yllÀpidettÀvyyden kannalta. Kanbanista johtuva selkeÀmpi tuotantovaiheiden seuranta mahdollisti vakaamman yllÀpidettÀvyyden testiautomaatiolle.
Tutkimus nosti esille merkittÀvÀn kehitysidean testiautomaation skriptausprosessin parantamiseksi. Ajatus parannuksen taustalla on toteuttaa skriptausprosessi kÀyttÀen grey-box testausmenetelmÀÀ
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