Eur. Phys. J. C (2017) 77: 161 A measurement of the phase difference between the short- and long-distance
contributions to the $B^{+}\to K^{+}\mu^{+}\mu^{-}$ decay is performed by
analysing the ...dimuon mass distribution. The analysis is based on $pp$ collision
data corresponding to an integrated luminosity of 3 $\rm fb^{-1}$ collected by
the LHCb experiment in 2011 and 2012. The long-distance contribution to the
$B^{+}\to K^{+}\mu^{+}\mu^{-}$ decay is modelled as a sum of relativistic
Breit--Wigner amplitudes representing different vector meson resonances
decaying to muon pairs, each with their own magnitude and phase. The measured
phases of the $J/\psi$ and $\psi(2S)$ resonances are such that the interference
with the short-distance component in dimuon mass regions far from their pole
masses is small. In addition, constraints are placed on the Wilson
coefficients, $\mathcal{C}_{9}$ and $\mathcal{C}_{10}$, and the branching
fraction of the short-distance component is measured.
JHEP03(2017)036 The ratio of branching fractions and the difference in $CP$ asymmetries of
the decays $B^+\to J/\psi \pi^+$ and $B^+\to J/\psi K^+$ are measured using a
data sample of $pp$ collisions ...collected by the LHCb experiment, corresponding
to an integrated luminosity of $3~{{\,\mbox{fb}^{-1}}}$ at centre-of-mass
energies of 7 and $8~\mathrm{\,Te\kern -0.1em V}$. The results are
\begin{equation*} {\mathcal{B}(B^+\to J/\psi \pi^+)\over\mathcal{B}(B^+\to
J/\psi K^+)}=(3.83\pm0.03\pm0.03)\times10^{-2}\,, \end{equation*}
\begin{equation*} \mathcal{A}^{CP}(B^+\to J/\psi \pi^+)-\mathcal{A}^{CP}(B^+\to
J/\psi K^+)=(1.82\pm0.86\pm0.14)\times10^{-2}, \end{equation*} where the first
uncertainties are statistical and the second are systematic. Combining this
result with a recent LHCb measurement of $\mathcal{A}^{CP}(B^+\to J/\psi K^+)$
provides the most precise estimate to date of $CP$ violation in the decay
$B^+\to J/\psi \pi^+$, \begin{equation*} \mathcal{A}^{CP}(B^+\to J/\psi \pi^+)
=(1.91\pm0.89\pm0.16)\times10^{-2}. \end{equation*}
Phys. Rev. Lett. 118, 071801 (2017) Decays of the $\Xi_b^-$ and $\Omega_b^-$ baryons to the charmless final
states $p h^{-}h^{\prime -}$, where $h^{(\prime)}$ denotes a kaon or pion, are
searched for ...with the LHCb detector. The analysis is based on a sample of
proton-proton collision data collected at centre-of-mass energies $\sqrt{s} =
7$ and $8 TeV$, corresponding to an integrated luminosity of $3 {\rm fb}^{-1}$.
The decay $\Xi_b^- \to p K^-K^-$ is observed with a significance of $8.7$
standard deviations, and evidence at the level of $3.4$ standard deviations is
found for the $\Xi_b^- \to p K^-\pi^-$ decay. Results are reported, relative to
the $B^-\to K^+K^-K^-$ normalisation channel, for the products of branching
fractions and $b$-hadron production fractions. The branching fractions of
$\Xi_b^- \to p K^-\pi^-$ and $\Xi_b^- \to p \pi^-\pi^-$ relative to $\Xi_b^-
\to p K^-K^-$ decays are also measured.
JHEP 12 (2016) 087 A combination of measurements sensitive to the CKM angle $\gamma$ from LHCb
is performed. The inputs are from analyses of time-integrated $B^{+}\rightarrow
DK^+$, $B^{0} ...\rightarrow D K^{*0}$, $B^{0} \rightarrow D K^+ \pi^-$ and $B^{+}
\rightarrow D K^+\pi^+\pi^-$ tree-level decays. In addition, results from a
time-dependent analysis of $B_{s}^{0} \rightarrow D_{s}^{\mp}K^{\pm}$ decays
are included. The combination yields $\gamma = (72.2^{+6.8}_{-7.3})^\circ$,
where the uncertainty includes systematic effects. The 95.5% confidence level
interval is determined to be $\gamma \in 55.9,85.2^\circ$. A second
combination is investigated, also including measurements from $B^{+}
\rightarrow D \pi^+$ and $B^{+} \rightarrow D \pi^+\pi^-\pi^+$ decays, which
yields compatible results.
Phys. Lett. B 767 (2017), 177-187 A measurement of the time-integrated $CP$ asymmetry in the Cabibbo-suppressed
decay $D^0\rightarrow K^-K^+$ is performed using pp collision data,
corresponding to an ...integrated luminosity of 3fb$^{-1}$, collected with the
LHCb detector at centre-of-mass energies of 7 and 8 TeV. The flavour of the
charm meson at production is determined from the charge of the pion in
$D^{*+}\rightarrow D^0 \pi^+$ and $D^{*-}\rightarrow \bar{D^0} \pi^-$ decays.
The time-integrated $CP$ asymmetry $A_{CP}(K^-K^+)$ is obtained assuming
negligible $CP$ violation in charm mixing and in Cabibbo-favoured
$D^0\rightarrow K^-\pi^+$, $D^+\rightarrow K^-\pi^+\pi^+$ and $D^+\rightarrow
\bar{K^0}\pi^+$ decays used as calibration channels. It is found to be
$A_{CP}(K^-K^+)=(0.14\pm0.15(stat)\pm0.10(syst))\%$. A combination of this
result with previous LHCb measurements yields
$A_{CP}(K^-K^+)=(0.04\pm0.12(stat)\pm0.10(syst))\%$,
$A_{CP}(\pi^-\pi^+)=(0.07\pm0.14(stat)\pm0.11(syst))\%$. These are the most
precise measurements from a single experiment. The result for $A_{CP}(K^-K^+)$
is the most precise determination of a time-integrated $CP$ asymmetry in the
charm sector to date, and neither measurement shows evidence of CP asymmetry.
Phys. Rev. Lett. 118, 081801 (2017) A search for the $B^{0}\to K^{+}K^{-}$ decay is performed using
$pp$-collision data collected by LHCb. The data set corresponds to integrated
luminosities of 1 and ...2 fb$^{-1}$ at center-of-mass energies of 7 and 8 TeV,
respectively. This decay is observed for the first time, with a significance of
more than five standard deviations. The analysis also results in an improved
measurement of the branching fraction for the $B_s^0\to \pi^+\pi^-$ decay. The
measured branching fractions are $BR(B^0\to K^+K^-) = (7.80 \pm 1.27 \pm 0.81
\pm 0.21) \times 10^{-8}$ and $BR(B_s^0\to\pi^+\pi^-) = (6.91 \pm 0.54 \pm 0.63
\pm 0.19 \pm 0.40) \times 10^{-7}$. The first uncertainty is statistical, the
second is systematic, the third is due to the uncertainty on the $B^0\to
K^+\pi^-$ branching fraction used as a normalization. For the $B_s^0$ mode, the
fourth accounts for the uncertainty on the ratio of the probabilities for $b$
quarks to hadronize into $B_s^0$ and $B^0$ mesons.
Phys. Rev. D 95, 012006 (2017) The first observation of the rare decay$B^0_s \to \phi\pi^+\pi^-$ and
evidence for $B^0 \to \phi\pi^+\pi^-$ are reported, using $pp$ collision data
recorded by the LHCb ...detector at centre-of-mass energies $\sqrt{s} = 7$ and
8~TeV, corresponding to an integrated luminosity of $3{\mbox{\,fb}^{-1}}$. The
branching fractions in the $\pi^+\pi^-$ invariant mass range
$400<m(\pi^+\pi^-)<1600{\mathrm{\,Me\kern -0.1em V\!/}c^2}$ are $3.48\pm
0.23\pm 0.17\pm 0.35\times 10^{-6}$ and $1.82\pm 0.25\pm 0.41\pm 0.14\times
10^{-7}$ for $B^0_s \to \phi\pi^+\pi^-$ and $B^0 \to \phi\pi^+\pi^-$
respectively, where the uncertainties are statistical, systematic and from the
normalisation mode $B^0_s \to \phi\phi $. A combined analysis of the
$\pi^+\pi^-$ mass spectrum and the decay angles of the final-state particles
identifies the exclusive decays $B^0_s \to \phi f_0(980) $, $B_s^0 \to \phi
f_2(1270) $, and $B^0_s \to \phi\rho^0$ with branching fractions of $1.12\pm
0.16^{+0.09}_{-0.08}\pm 0.11\times 10^{-6}$, $0.61\pm 0.13^{+0.12}_{-0.05}\pm
0.06\times 10^{-6}$ and $2.7\pm 0.7\pm 0.2\pm 0.2\times 10^{-7}$,
respectively.
JHEP 12 (2016) 065 Measurements of the differential branching fraction and angular moments of
the decay $B^0 \to K^+ \pi^- \mu^+ \mu^-$ in the $K^+\pi^-$ invariant mass
range $1330<m(K^+ ...\pi^-)<1530~MeV/c^2$ are presented. Proton-proton collision
data are used, corresponding to an integrated luminosity of 3 $fb^{-1}$
collected by the LHCb experiment. Differential branching fraction measurements
are reported in five bins of the invariant mass squared of the dimuon system,
$q^2$, between 0.1 and 8.0 $GeV^2/c^4$. For the first time, an angular analysis
sensitive to the S-, P- and D-wave contributions of this rare decay is
performed. The set of 40 normalised angular moments describing the decay is
presented for the $q^2$ range 1.1--6.0 $GeV^2/c^4$.
Phys. Rev. Lett. 118, 021801 (2017) The polarization of photons produced in radiative $B^{0}_{s}$ decays is
studied for the first time. The data are recorded by the LHCb experiment in
$pp$ collisions ...corresponding to an integrated luminosity of 3fb$^{-1}$ at
center-of-mass energies of $7$ and $8$TeV. A time-dependent analysis of the
$B^{0}_{s} \to \phi \gamma$ decay rate is conducted to determine the parameter
${\mathcal{A}}^\Delta$, which is related to the ratio of right- over
left-handed photon polarization amplitudes in $b \to s \gamma$ transitions. A
value of ${\mathcal{A}}^\Delta=-0.98^{\,+0.46\,+0.23}_{\,-0.52\,-0.20}$ is
measured. This result is consistent with the Standard Model prediction within
two standard deviations.
Phys. Lett. B762 (2016) 253-262 A time-dependent angular analysis of $B_s^0\to\psi(2S)\phi$ decays is
performed using data recorded by the LHCb experiment. The data set corresponds
to an integrated ...luminosity of 3.0\invfb collected during Run 1 of the LHC. The
CP-violating phase and decay-width difference of the $B_s^0$ system are
measured to be $\phi_s = 0.23^{+0.29}_{-0.28} \pm 0.02$ rad and $\Delta\Gamma_s
= 0.066^{+0.041}_{-0.044} \pm 0.007$ ps$^{-1}$, respectively, where the first
uncertainty is statistical and the second systematic. This is the first time
that $\phi_s$ and $\Delta\Gamma_s$ have been measured in a decay containing the
$\psi(2S)$ resonance.
