411 research outputs found
Mixing and indirect violation in charm mesons at LHCb
No full textThe LHCb experiment has collected the world's largest sample of charmed hadrons. This sample is used to measure - mixing and to search for violation. New measurements of the mixing and -violating parameters , , and are presented
Model-independent measurement of charm mixing parameters in D0 -> K0S pi+ pi- decays
No full textThis thesis presents a measurement of charm mixing and CP-violation parameters using D0 -> K0S pi+ pi- decays. These mixing parameters include the mass and decay-width differences of the mass eigenstates of the D0-D0bar system. A search for Charge-Parity violation is performed through measurements of D0-D0b mixing and of the interference between mixing and decay amplitudes. The dataset consists of events reconstructed in proton-proton collisions collected by the LHCb experiment during the
operation of the Large Hadron Collider (LHC) from 2016 to 2018. This sample corresponds to an integrated luminosity of 5.4 fb^-1. The D0 decays are selected in semileptonically decays of b hadrons. The results are expressed in terms of the CP-averaged mixing parameters and CP-violating differences as
x_cp= (+4.29 +/- 1.48 (stat) +/- 0.26 (syst)) x 10^{-3}
y_cp= (+12.61 +/- 3.12 (stat) +/- 0.83 (syst)) x 10^{-3}
delta x= (-0.77 +/- 0.93 (stat) +/- 0.28 (syst)) x 10^{-3}
delta y= (+3.01 +/- 1.92 (stat) +/- 0.26 (syst)) x 10^{-3}
where the first uncertainty is statistical and the second is systematic. They correspond to the mixing and CP-violation parameters
x = 0.46^{+0.15}_{-0.16} x 10^{-2}
y = 1.24^{+0.32}_{-0.33} x 10^{-2}
|q/p| = 1.21^{+0.21}_{-0.15}
\phi = -0.132^{+0.088}_{-0.120} rad.
The value of x deviates from zero with a significance of almost 3 sigma.
These results are complementary to and consistent with previous measurements and with the current world-average values.
They represent an independent and complementary knowledge of the charm-mixing parameters.
A combination with the recent LHCb analysis of Dstar -> D0 (->K0S pi+ pi-) pi decays is also reported.LPHE
Model-independent measurement of charm mixing parameters in decays
No full textThis thesis presents a measurement of charm mixing and CP-violation parameters using decays. These mixing parameters include the mass and decay-width differences of the mass eigenstates of the - system. A search for Charge-Parity violation is performed through measurements of - mixing and of the interference between mixing and decay amplitudes. The dataset consists of events reconstructed in collisions collected by the LHCb experiment during the operation of the Large Hadron Collider (LHC) from 2016 to 2018. This sample corresponds to an integrated luminosity of 5.4 fb. The decays are selected in semileptonically decays of hadrons. The results are expressed in terms of the CP-averaged mixing parameters and CP-violating differences as \begin{align*} x_{\rm CP} &= [ \,\,\,\,\,4.29 \pm 1.48 \mbox{(stat)} \pm 0.26 \mbox{(syst)} ] \times 10^{-3}\,,\\ y_{\rm CP} &= [ \,\,12.61 \pm 3.12 \mbox{(stat)} \pm 0.83 \mbox{(syst)} ] \times 10^{-3} \,,\\ \Delta x \,\, &= [ \,-0.77 \pm 0.93 \mbox{(stat)} \pm 0.28 \mbox{(syst)} ] \times 10^{-3} \,,\\ \Delta y \, &= [ \,\,\,\,\,3.01 \pm 1.92 \mbox{(stat)} \pm 0.26 \mbox{(syst)} ] \times 10^{-3} \,. \end{align*} where the first uncertainty is statistical and the second is systematic. They correspond to the mixing and CP-violation parameters \begin{align*} x &= 0.46^{+0.15}_{-0.16}\times10^{-2} \,, \\ y &= 1.24^{+0.32}_{-0.33}\times10^{-2} \,, \\ |q/p| &= 1.21^{+0.21}_{-0.15} \,,\\ \phi &= -0.132^{+0.088}_{-0.120} \, \mbox{rad}. \end{align*} The value of deviates from zero with a significance of almost 3. These results are complementary to and consistent with previous measurements and with the current world-average values. They represent an independent and complementary knowledge of the charm-mixing parameters. A combination with the recent LHCb analysis of decays is also reported
Charm Physics at LHCb
No full textWe review four most precise measurements from charm physics program at the LHCb during 2021. These include the first observation of non-zero mass difference between neutral charm-meson eigenstates, the world most precise determination of both time-dependent and time-integrated charge-parity.LPH
Charm Physics at LHCb
No full textWe review four most precise measurements from charm physics program at the LHCb during 2021. These include the first observation of non-zero mass difference between neutral charm-meson eigenstates, the world most precise determination of both time-dependent and time-integrated charge-parity
Case Studies in Spiritual Care: Chealthcare Chaplaincy ASsessments, Interventions and Outcomes, by George Fitchett and Steve Nolan, eds.
No full textReviewed by Taqwa Surapat
Effects of a Guide Field on the Larmor Electric Field and Upstream Electron Temperature Anisotropy in Collisionless Asymmetric Magnetic Reconnection
No full text
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