O. G. Girard

Isospin Amplitudes in Λb0→J/ψΛ(Σ0) and Ξb0→J/ψΞ0(Λ) Decays

R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva et autres

Ratios of isospin amplitudes in hadron decays are a useful probe of the interplay between weak and strong interactions and allow searches for physics beyond the standard model. We present the first results on isospin amplitudes in $b$-baryon decays, using data corresponding …

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Search for A ′ → μ + μ − Decays

R. Aaij, Carlos Abellán Beteta, T. Ackernley, B. Adeva et autres

Searches are performed for both promptlike and long-lived dark photons, ${A}^{\ensuremath{'}}$, produced in proton-proton collisions at a center-of-mass energy of 13 TeV. These searches look for ${A}^{\ensuremath{'}}\ensuremath{\rightarrow}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decays using a data sample corresponding to an integrated luminosity of $5.5\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected …

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Observation of Several Sources of CP Violation in B+→π+π+π− Decays

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi et autres

Observations are reported of different sources of CP violation from an amplitude analysis of B^{+}→π^{+}π^{+}π^{-} decays, based on a data sample corresponding to an integrated luminosity of 3 fb^{-1} of pp collisions recorded with the LHCb detector. A large CP asymmetry is …

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Search for Lepton-Flavor Violating Decays B+→K+μ±e∓

R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva et autres

A search for the lepton-flavor violating decays ${B}^{+}\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}}$ is performed using a sample of proton-proton collision data, collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. No significant …

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Measurement of Charged Hadron Production in Z -Tagged Jets in Proton-Proton Collisions at s=8 TeV

R. Aaij, Carlos Abellán Beteta, B. Adeva, M. Adinolfi et autres

The production of charged hadrons within jets recoiling against a Z boson is measured in proton-proton collision data at sqrt[s]=8 TeV recorded by the LHCb experiment. The charged-hadron structure of the jet is studied longitudinally and transverse to the jet axis for …

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Precision measurement of the Λc+ , Ξc+ , and Ξc0 baryon lifetimes

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi et autres

The LHCb collaboration reports measurements of three charmed baryon lifetimes using 7 and 8 TeV data. These results significantly improve on the precision of existing world averages. The new ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}$ lifetime is found to be somewhat higher than previous estimates.

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Measurement of the branching fraction and $$C\!P$$ asymmetry in $${{{B} ^+}} \!\rightarrow {{J /\psi }} {{\rho } ^+} $$ decays

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi et autres

The branching fraction and direct CP asymmetry of the decay B + → J/ψ ρ + are measured using protonproton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to a total integrated luminosity of …

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Search for CP Violation in Ds+→KS0π+ , D+→KS0K+ , and D+→ϕπ+ Decays

R. Aaij, Carlos Abellán Beteta, B. Adeva, M. Adinolfi et autres

A search for charge-parity ($CP$) violation in Cabibbo-suppressed ${D}_{s}^{+}\ensuremath{\rightarrow}{K}_{\mathrm{S}}^{0}{\ensuremath{\pi}}^{+}$, ${D}^{+}\ensuremath{\rightarrow}{K}_{\mathrm{S}}^{0}{K}^{+}$, and ${D}^{+}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}$ decays is reported using proton-proton collision data, corresponding to an integrated luminosity of $3.8\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected at a center-of-mass energy of 13 TeV with the LHCb detector. High-yield samples …

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Search for Lepton-Universality Violation in B+→K+ℓ+ℓ− Decays

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi et autres

A measurement of the ratio of branching fractions of the decays B^{+}→K^{+}μ^{+}μ^{-} and B^{+}→K^{+}e^{+}e^{-} is presented. The proton-proton collision data used correspond to an integrated luminosity of 5.0 fb^{-1} recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 …

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Observation of Two Resonances in the Λb0π± Systems and Precise Measurement of Σb± and Σb*± Properties

R. Aaij, C. Abellán Beteta, B. Adeva, M. Adinolfi et autres

The first observation of two structures consistent with resonances in the final states ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${\mathrm{\ensuremath{\Lambda}}}_{b}^{0}{\ensuremath{\pi}}^{+}$ is reported using samples of $pp$ collision data collected by the LHCb experiment at $\sqrt{s}=7$ and 8 TeV, corresponding to an integrated luminosity of $3\text{ }\text{ …

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Observation of the doubly Cabibbo-suppressed decay $\Xi_c^+ \to p\phi$

S. Akar, P. Albicocco, J. Albrecht, F. Alessio et autres

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Measurement of Angular and CP Asymmetries in D0→π+π−μ+μ− and D0→K+K−μ+μ− Decays

R. Aaij, B. Adeva, M. Adinolfi, C. Aidala et autres

The first measurements of the forward-backward asymmetry of the dimuon pair (${A}_{\mathrm{FB}}$), the triple-product asymmetry (${A}_{2\ensuremath{\phi}}$), and the charge-parity-conjugation asymmetry (${A}_{CP}$), in ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ and ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$ decays are reported. They are performed using data from proton-proton collisions collected with the LHCb experiment from …

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