21 research outputs found
Measurement of the time-integrated <i>CP</i> asymmetry in <i>D</i><sup>0</sup> → <i>K <sub>S</sub></i> <sup>0</sup> <i>K <sub>S </sub></i><sup>0</sup> decays
A measurement of the time-integrated asymmetry in decays is reported. The data correspond to an integrated luminosity of
about fb collected in 2015-2016 by the LHCb collaboration in
collisions at a centre-of-mass energy of TeV. The candidate is
required to originate from a decay, allowing
the determination of the flavour of the meson using the pion charge. The
decay, which has a well measured asymmetry,
is used as a calibration channel. The asymmetry for is measured to be \begin{equation*} \mathcal{A}^{CP}(D^0\rightarrow
K^0_S K^0_S) = (4.3\pm 3.4\pm 1.0)\%, \end{equation*} where the first
uncertainty is statistical and the second is systematic. This result is
combined with the previous LHCb measurement at lower centre-of-mass energies to
obtain \begin{equation*} \mathcal{A}^{CP}(D^0\rightarrow K^0_S K^0_S) = (2.3\pm
2.8\pm 0.9)\%. \end{equation*}Comment: All figures and tables, along with any supplementary material and
additional information, are available at
https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-012.htm
The Basic Pharmacology of Opioids Informs the Opioid Discourse about Misuse and Abuse: A Review
First measurement of the Z→μ+μ− angular coefficients in the forward region of pp collisions at √s = 13 TeV
The first study of the angular distribution of
μ
+
μ
−
pairs produced in the forward rapidity region via the Drell-Yan reaction
p
p
→
γ
∗
/
Z
+
X
→
ℓ
+
ℓ
−
+
X
is presented, using data collected with the LHCb detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of
5.1
fb
−
1
. The coefficients of the five leading terms in the angular distribution are determined as a function of the dimuon transverse momentum and rapidity. The results are compared to various theoretical predictions of the
Z
-boson production mechanism and can also be used to probe transverse-momentum-dependent parton distributions within the proton