Abstract
With the demonstration that LHCb can successfully perform forward precision measurements with event pileup, the operation and trigger strategy evolved significantly during the LHC Run 1 allowing LHCb to collect over 3fb −1 at centre-of-mass energies of 7TeV and 8TeV. Increased bandwidth opened the door for LHCb to extend the physics program. The additional statistics and well managed systematic effects together with the stable trigger and data taking conditions have led to a very large number of world-class measurements and dominance in heavy flavour physics [1], in addition to a reputation of an excellent forward general purpose detector at the LHC. Long Shutdown (LS) 1 (2013–2014) will allow LHCb to fully explore the large statistics collected and prepare LHCb for Run 2 (2015 – 2017). However, even after an additional expected integrated luminosity of 5–6 fb −1 in Run 2, many of the LHCb precision measurements will remain limited by statistics, and some exploratory physics modes will not even be accessible yet. With the need for reconstructing the event topology in order to efficiently trigger on the beauty and the charm hadrons decays, the current 1 MHz readout limit is the main bottle neck to run at higher luminosity and with higher trigger efficiencies. LHCb will therefore undergo a major upgrade in LS 2 ( 2018 – 2019) aimed at collecting an order of magnitude more data by 2028. The upgrade consists of a full readout at the LHC bunch crossing rate ( 40 MHz) with the ultimate flexibility of only a software trigger. In order to increase the instantaneous luminosity up to 2x10 33 cm −2 s −1 , several sub-detector upgrades are also underway to cope with the higher occupancies and radiation dose.
Highlights
The main objective of LHCb is measuring indirect effects of New Physics in processes which are naturally strongly suppressed in the Standard Model, i.e. typically those which involve Flavour Changing Neutral Currents (FCNC) mediated by box and penguin diagrams
The theoretical understanding for many of these observables is very good within the framework of the Standard Model (SM), and LHCb aims at reaching experimental sensitivities which are comparable to the theoretical uncertainties
Experience with the detector operation and with the analysis of the data from Run 1 shows that systematics effects may be managed very well, and that the precisions in the measurements are not expected to be limited by systematics uncertainties
Summary
The main objective of LHCb is measuring indirect effects of New Physics in processes which are naturally strongly suppressed in the Standard Model, i.e. typically those which involve Flavour Changing Neutral Currents (FCNC) mediated by box and penguin diagrams. The beauty and the charm sectors contain a very large repertoire of decays and topologies, and LHCb aims at exploring all the possible observables sensitive to new physics; timedependent CP asymmetries to determine contributions to the phases from New physics, amplitude corrections by measuring branching ratios and oscillation frequencies, and a large number of angular analyses to discern. This provides an opportunity to re-optimize the experiment with upgraded technologies to cope more efficiently with the higher occupancies and further improvements to the physics capabilities
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