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تسجيل مستخدم جديدOverview of LHCb
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H. Terrier
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An overview of LHCb experiment is given, focusing on detector, trigger and expected physics performances. LHCb is a second generation b physics experiment design to do precise measurements of CP violation in B meson system and to study b hadron rare decays.
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The LHCb detector is a forward spectrometer at the Large Hadron Collider (LHC) at CERN. The experiment is designed for precision measurements of CP violation and rare decays of beauty and charm hadrons. In this paper the performance of the various LH
Cb sub-detectors and the trigger system are described, using data taken from 2010 to 2012. It is shown that the design criteria of the experiment have been met. The excellent performance of the detector has allowed the LHCb collaboration to publish a wide range of physics results, demonstrating LHCbs unique role, both as a heavy flavour experiment and as a general purpose detector in the forward region.
A time dependent angular analysis of the decay mode $B_s rightarrow J/psi phi$ allows for the measurement of the mixing induced CP-violating phase $phi_s$. Within the Standard Model $phi_s$ is theoretically precisely predicted to be very small, howev
er many Standard Model extensions predict sizeable contributions to this phase. The current experimental knowledge of $phi_s$ has very larger uncertainties. However already with the data expected to be delivered within the next year, the LHCb experiment at the Large Hadron Collider at CERN, has the potential to improve significantly existing measurements. In a data set of up to 37.5 pb$^{-1}$ taken in 2010, first physics signals in the LHCb detector are reconstructed and their properties are compared to Monte Carlo predictions. Based on recently published measurements of $bbar{b}$ cross-sections from the LHCb collaboration, the sensitivity on the $CP$ violating phase $phi_s$ in the decay $B_s rightarrow J/psi phi$ is evaluated. Additionally an alternative method to potentially extract complementary information on $phi_s$ from the measurement of the asymmetry in semileptonic final states is presented.
CLICdp, the CLIC detector and physics study, is an international collaboration presently composed of 23 institutions. The collaboration is addressing detector and physics issues for the future Compact Linear Collider (CLIC), a high-energy electron-po
sitron accelerator which is one of the options for the next collider to be built at CERN. Precision physics under challenging beam and background conditions is the key theme for the CLIC detector studies. This leads to a number of cutting-edge R&D activities within CLICdp. The talk includes a brief introduction to CLIC, accelerator and detectors, hardware R&D as well as physics studies at CLIC.
LHCb is the experiment at the Large Hadron Collider devoted to studies of new phenomena in CP violation and in rare decays. This review summarizes the status of the experiment in the imminence of the data taking, the prospects for the first measurements and highlights of its full physics program.
We report a search for the doubly charmed baryon $Xi_{cc}^{+}$ through the decay $Xi_{cc}^{+} to Lambda_{c}^{+} K^{-} pi^{+}$, using a data sample corresponding to an integrated luminosity of $0.65~mathrm{pb^{-1}}$ of $pp$ collisions at $mathrm{sqrt{
s}} = 7~mathrm{TeV}$. In the mass range 3300-3800$~mathrm{MeV}/c^{2}$ no significant signal is observed. Upper limits at $95%$ confidence level are set on $R$, the ratio of the production cross section of the $Xi_{cc}^{+}$ times the relevant branching fraction over the $Lambda_{c}^{+}$ cross section, as a function of the $Xi_{cc}^{+}$ mass and lifetime. The largest upper limits on $R$ over the investigated mass range are $R<1.5times10^{-2}$ for a lifetime of $100~mathrm{fs}$ and $R<3.9times10^{-4}$ for a lifetime of $400~mathrm{fs}$.
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