U. Uwer

Performance of the LHCb Outer Tracker

The LHCb Outer Tracker is a gaseous detector covering an area of 5 x 6 m(2) with 12 double layers of straw tubes. The detector with its services are described together with the commissioning and calibration procedures. Based on data of the first LHC running period from 2010 to 2012, the performance of the readout electronics and the single hit resolution and efficiency are presented. The efficiency to detect a hit in the central half of the straw is estimated to be 99.2%, and the position resolution is determined to be approximately 200 mu m. The Outer Tracker received a dose in the hottest region corresponding to 0.12 C/cm, and no signs of gain deterioration or other ageing effects are observed.

Resonances in QCD

Abstract We report on the EMMI Rapid Reaction Task Force meeting ‘ Resonances in QCD ’, which took place at GSI October 12–14, 2015. A group of 26 people met to discuss the physics of resonances in QCD. The aim of the meeting was defined by the following three key questions: • What is needed to understand the physics of resonances in QCD? • Where does QCD lead us to expect resonances with exotic quantum numbers? • What experimental efforts are required to arrive at a coherent picture? For light mesons and baryons only those with up , down and strange quark content were considered. For heavy–light and heavy–heavy meson systems, those with charm quarks were the focus. This document summarizes the discussions by the participants, which in turn led to the coherent conclusions we present here.

LHCb Physics Performance

The LHCb detector has recently undergone a reoptimization with respect to its original design. In the following, the expected physics potential of the reoptimized detector is discussed. The expectations are based on a Monte Carlo simulation of the detector performance including the simulation of the trigger. LHCb will offer an excellent opportunity to determine precisely the CKM parameters. The manifold of different CP measurements will over‐constrain the unitarity triangles and will allow to spot new physics, if present.