M. Whitehead

Study of the Bose-Einstein correlations of same-sign pions in proton-lead collisions

R. Aaij, Ahmed Sameh Wagih Abdelmotteleb, C. Abellan Beteta, F. Abudinén et autres

Abstract Correlations of same-sign charged pions are analysed using proton-lead collision data collected by the LHCb experiment at a nucleon-nucleon centre-of-mass energy of 5.02 TeV, corresponding to an integrated luminosity of 1.06 nb−1. Bose-Einstein correlations are observed in the form of an …

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Search for the doubly heavy baryon decaying to *

R. Aaij, A. S. W. Abdelmotteleb, Carlos Abellán Beteta, F. Abudinén et autres

Abstract A first search for the decay is performed by the LHCb experiment with a data sample of proton-proton collisions, corresponding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass energies of 7, 8, and 13 TeV. Two peaking structures are …

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Searches for rare $ {B}_s^0 $ and B$^{0}$ decays into four muons

R. Aaij, A. S. W. Abdelmotteleb, C. Abellán Beteta, F. Abudinén et autres

Searches for rare $B_s^0$ and $B^0$ decays into four muons are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 9 $\text{fb}^{-1}$. Direct decays and decays via light scalar and $J/\psi$ resonances are considered. No …

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Study of the lineshape of the χc1(3872) state

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

A study of the lineshape of the ${\ensuremath{\chi}}_{c1}(3872)$ state is made using a data sample corresponding to an integrated luminosity of $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate ${\ensuremath{\chi}}_{c1}(3872)$ …

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Observation of New Ξ c 0 Baryons Decaying to Λ c + K −

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

The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed with a large significance …

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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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First Observation of Excited Ω b − States

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

Excited ${\mathrm{\ensuremath{\Omega}}}_{b}^{\ensuremath{-}}$ baryons are seen as narrow peaks in the ${\mathrm{\ensuremath{\Xi}}}_{b}^{0}\phantom{\rule{0}{0ex}}{K}^{\ensuremath{-}}$ mass spectra for the first time.

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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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Search for CP violation using triple product asymmetries in Λ[subscript b][superscript 0] → pK⁻π⁺π⁻, Λ[subscript b]0 → pK⁻K⁺K⁻ and Ξb0 → pK⁻K⁻π⁺ decays

R. Aaij, B. Adeva, M. Adinolfi, Z. Ajaltouni et autres

Measurement of the mass and lifetime of the Ω b − baryon

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

A proton-proton collision data sample, corresponding to an integrated luminosity of $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by LHCb at $\sqrt{s}=7$ and 8 TeV, is used to reconstruct $63\ifmmode\pm\else\textpm\fi{}9$ ${\mathrm{\ensuremath{\Omega}}}_{b}^{\ensuremath{-}}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Omega}}}_{c}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\mathrm{\ensuremath{\Omega}}}_{c}^{0}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ decays. Using the ${\mathrm{\ensuremath{\Xi}}}_{b}^{\ensuremath{-}}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Xi}}}_{c}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}$, ${\mathrm{\ensuremath{\Xi}}}_{c}^{0}\ensuremath{\rightarrow}p{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ decay mode for calibration, the lifetime ratio and …

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Measurement of forward W and Z boson production in association with jets in proton-proton collisions at s = 8 $$ \sqrt{s}=8 $$ TeV

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

The production of W and Z bosons in association with jets is studied in the forward region of proton-proton collisions collected at a centre-of-mass energy of 8 TeV by the LHCb experiment, corresponding to an integrated luminosity of 1.98 ± 0.02 fb−1. …

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Model-independent confirmation of the Z(4430)− state

R. Aaij, B. Adeva, M. Adinolfi, A. A. Affolder et autres

The decay ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\psi}(2S){K}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ is analyzed using $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of $pp$ collision data collected with the LHCb detector. A model-independent description of the $\ensuremath{\psi}(2S)\ensuremath{\pi}$ mass spectrum is obtained, using as input the $K\ensuremath{\pi}$ mass spectrum and angular distribution derived directly from data, …

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