Measurements of the branching fraction ratio ${\cal{B}(\phi \to \mu^+
\mu^-)/\cal{B}(\phi\to e^+e^-)}$ with ${D_{s}^{+} \to \pi^{+} \phi}$ and
${D^{+} \to \pi^{+} \phi}$ decays, denoted $R^{s}_{\phi ...\pi}$ and $R^{d}_{\phi
\pi}$, are presented. The analysis is performed using a dataset corresponding
to an integrated luminosity of 5.4$\,\rm{fb}^{-1}$ of $pp$ collision data
collected with the LHCb experiment. The branching fractions are normalised with
respect to the ${B^{+} \to K^{+} J/\psi(\to e^+e^-)}$ and ${B^{+} \to K^{+}
J/\psi(\to \mu^+\mu^-)}$ decay modes. The combination of the results yields $$
R_{\phi \pi} = 1.022 \pm 0.012 \,({\rm stat}) \, \pm 0.048 \,({\rm syst}). $$
The result is compatible with previous measurements of the $\phi \to
\ell^{+}\ell^{-}$ branching fractions and predictions based on the Standard
Model.
JHEP 05(2024) 025 A measurement of $CP$-violating observables associated with the interference
of $B^0\to D^0 K^{*}(892)^0$ and $B^0\to \bar{D}^0 K^*(892)^0$ decay amplitudes
is performed in the $D^0 ...\to K^{\mp}\pi^{\pm}(\pi^+\pi^-),$ $D^0 \to
\pi^+\pi^-(\pi^+\pi^-)$, and $D^0\to K^+K^-$ final states using data collected
by the LHCb experiment corresponding to an integrated luminosity of $9$
$\text{fb}^{-1}$. $CP$-violating observables related to the interference of
$B^0_s\to D^0 \bar{K}^*(892)^0$ and $B_s^0\to \bar{D}^0 \bar{K}^*(892)^0$ are
also measured, but no evidence for interference is found. The $B^0$ observables
are used to constrain the parameter space of the CKM angle $\gamma$ and the
hadronic parameters $r_{B^0}^{DK^*}$ and $\delta_{B^0}^{DK^*}$ with inputs from
other measurements. In a combined analysis, these measurements allow for four
solutions in the parameter space, only one of which is consistent with the
world average.
Objective: This study evaluated the effects of neuromuscular electrical stimulation (NMES) on muscle strength, range of motion (ROM) and gross motor function, among spastic hemiparetic children while ...standing, walking, running and jumping. Methods: Ten children were divided into two groups of five. The children who were normally receiving physical therapy sessions twice a week had two 30-minute NMES sessions per week (group 1), while those who were having one physical therapy session per week had one 30-minute NMES session per week (group 2), for seven weeks in both groups. The children were evaluated three times: before beginning the NMES protocol (initial), right after the end of the protocol (final) and eight weeks after the final evaluation (follow-up). The evaluations included manual goniometry on ankle dorsiflexion, manual muscle strength of the tibialis anterior and gross motor function (measurements while standing, walking, running and jumping). The statistical analysis was performed using the Wilcoxon and Mann-Whitney tests, considering a p level of 0.05. Results: There were significant increases in muscle strength, gross motor function and passive ROM of ankle dorsiflexion, in both groups, and in active dorsiflexion in the first group. No significant differences were found between the groups. Conclusions: The improvements in ROM, muscle strength and gross motor function demonstrated that the use of NMES was effective in both groups, since no significant differences were found between the groups. This study suggests that NMES may be a useful therapeutic tool, even when applied once a week. Further studies are needed to confirm these findings.
JHEP 04 (2024) 111 The production of $\psi(2S)$ mesons in proton-lead collisions at a
centre-of-mass energy per nucleon pair of $\sqrt{s_{NN}}=8.16$ TeV is studied
with the LHCb detector using data ...corresponding to an integrated luminosity of
34 nb$^{-1}$. The prompt and nonprompt $\psi(2S)$ production cross-sections and
the ratio of the $\psi(2S)$ to $J/\psi$ cross-section are measured as a
function of the meson transverse momentum and rapidity in the nucleon-nucleon
centre-of-mass frame, together with forward-to-backward ratios and nuclear
modification factors. The production of prompt $\psi(2S)$ is observed to be
more suppressed compared to $pp$ collisions than the prompt $J/\psi$
production, while the nonprompt productions have similar suppression factors.
Two drift tubes (DTs) chambers of the CMS muon barrel system were exposed to a 40
MHz bunched muon beam at the CERN SPS, and for the first time the whole CMS Level-1 DTs-based trigger system chain ...was tested. Data at different energies and inclination angles of the incident muon beam were collected, as well as data with and without an iron absorber placed between the two chambers, to simulate the electromagnetic shower development in CMS. Special data-taking runs were dedicated to test for the first time the Track Finder system, which reconstructs track trigger candidates by performing a proper matching of the muon segments delivered by the two chambers. The present paper describes the results of these measurements.
Abstract Decays of the form B ^sub (s)^^sup 0^arrow rightJ/psiK ^sub S^^sup 0^ h ^sup +^ h ^sup (')-^(h ^sup (')^= K,pi) are searched for in proton-proton collision data corresponding to an ...integrated luminosity of 1.0 fb^sup -1^ recorded with the LHCb detector. The first observation of the B ^sub s^^sup 0^ arrow rightJ/psiK ^sub S^^sup 0^ K ^sup ±^ pi ^sup ^ decay is reported, with significance in excess of 10 standard deviations. The B ^sup 0^arrow rightJ/psiK ^sub S^^sup 0^ K ^sup +^ K ^sup -^ decay is also observed for the first time. The branching fraction of B ^sup 0^arrow rightJ/psiK ^sub S^^sup 0^ pi ^sup +^ pi ^sup -^ is determined, to significantly better precision than previous measurements, using B ^sup 0^arrow rightJ/psiK ^sub S^^sup 0^ as a normalisation channel. Branching fractions and upper limits of the other B ^sub (s)^^sup 0^ arrow rightJ/psiK ^sub S^^sup 0^ h ^sup +^ h ^sup (')-^ modes are determined relative to that of the B ^sup 0^arrow rightJ/psiK ^sub S^^sup 0^ pi ^sup +^ pi ^sup -^ decay. Figure not available: see fulltext.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract The first observation of the Cabibbo-suppressed decay Lambda ^sub b^^sup 0^ arrow right J/psippi ^sup -^ is ...reported using a data sample of proton-proton collisions at 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb^sup -1^. A prominent signal is observed and the branching fraction relative to the decay mode Lambda ^sub b^^sup 0^ arrow right J/psipK ^sup -^ is determined to be ... A search for direct CP violation is performed. The difference in the CP asymmetries between these two decays is found to be ... which is compatible with CP symmetry at the 2.2sigma level. Figure not available: see fulltext.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract Time-integrated CP asymmetries in D ^sup 0^ decays to the final states K ^sup -^ K ^sup +^ and pi ^sup -^ pi ^sup ...+^ are measured using proton-proton collisions corresponding to 3fb^sup -1^ of integrated luminosity collected at centre-of-mass energies of 7 TeV and 8 TeV. The D ^sup 0^ mesons are produced in semileptonic b-hadron decays, where the charge of the accompanying muon is used to determine the initial flavour of the charm meson. The difference in CP asymmetries between the two final states is measured to be ... A measurement of A ^sub CP^ (K ^sup -^ K ^sup +^) is obtained assuming negligible CP violation in charm mixing and in Cabibbo-favoured D decays. It is found to be ...where the correlation coefficient between DeltaA ^sub CP^ and A ^sub CP^ (K ^sup -^ K ^sup +^) is rho = 0.28. By combining these results, the CP asymmetry in the D ^sup 0^ arrow right pi ^sup -^ pi ^sup +^ channel is A ^sub CP^ (pi ^sup -^ pi ^sup +^) = (-0.20 ± 0.19 (stat) ± 0.10 (syst))%. Figure not available: see fulltext.
JHEP05(2024)243 The ratio of production cross-sections of $\psi(2S)$ over $J/\psi$ mesons as
a function of charged-particle multiplicity in proton-proton collisions at a
centre-of-mass energy ...$\sqrt{s}=13$ TeV is measured with a data sample
collected by the LHCb detector, corresponding to an integrated luminosity of
658 pb$^{-1}$. The ratio is measured for both prompt and non-prompt $\psi(2S)$
and $J/\psi$ mesons. When there is an overlap between the rapidity ranges over
which multiplicity and charmonia production are measured, a
multiplicity-dependent modification of the ratio is observed for prompt mesons.
No significant multiplicity dependence is found when the ranges do not overlap.
For non-prompt production, the $\psi(2S)-to-J/\psi$ production ratio is roughly
independent of multiplicity irrespective of the rapidity range over which the
multiplicity is measured.
The results are compared to predictions of the co-mover model and agree well
except in the low multiplicity region. The ratio of production cross-sections
of $\psi(2S)$ over $J/\psi$ mesons are cross-checked with other measurements in
di-lepton channels and found to be compatible.
JHEP 02 (2024) 173 A study of $B_c^+ \rightarrow \chi_c \pi^+$ decays is reported using
proton-proton collision data, collected with the LHCb detector at
centre-of-mass energies of 7, 8, and 13 TeV, ...corresponding to an integrated
luminosity of 9fb$^{-1}$. The decay $B_c^+ \rightarrow \chi_{c2} \pi^+$ is
observed for the first time, with a significance exceeding seven standard
deviations. The relative branching fraction with respect to the $B_c^+
\rightarrow J/\psi \pi^+$ decay is measured to be $$ \frac{\mathcal{B}_{B_c^+
\rightarrow \chi_{c2} \pi^+}}
{\mathcal{B}_{B_c^+ \rightarrow J/\psi \pi^+}} =
0.37 \pm 0.06 \pm 0.02 \pm 0.01 , $$ where the first uncertainty is
statistical, the second is systematic, and the third is due to the knowledge of
the $\chi_c \rightarrow J/\psi \gamma$ branching fraction. No significant
$B_c^+ \rightarrow \chi_{c1} \pi^+$ signal is observed and an upper limit for
the relative branching fraction for the $B_c^+ \rightarrow \chi_{c1} \pi^+$ and
$B_c^+ \rightarrow \chi_{c2} \pi^+$ decays of $$ \frac{\mathcal{B}_{B_c^+
\rightarrow \chi_{c1} \pi^+}}
{\mathcal{B}_{B_c^+ \rightarrow \chi_{c2} \pi^+}} < 0.49 $$ is set at the
90\% confidence level.
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