Tara Shears

Physics studies at LHCb

LHCb is designed primarily to study CP violation, and to indirectly explore new physics through its contribution to B hadron decays. However it is also potentially sensitive to the many other physics processes that occur at LHC. I am particularly interested, with my students and UCD colleagues, in electroweak boson reconstruction at LHCb. We collaborate on measurements of Z, W and low mass Drell-Yan production through decays to muonic final states. These measurements provide valuable information about the underlying parton density functions (PDFs). In addition, precise Standard Model tests can be made of their ratios. We also collaborate with MSTW theorists to understand the best measurements that LHCb can make to constrain PDFs.

Currently, I convene the electroweak subgroup of LHCb. If you are interested in these or other aspects of electroweak physics, contact me.

Simulating the LHCb trigger with MAP2

The LHCb trigger must reduce 10MHz of visible interactions inside LHCb to no more than 2000Hz of selected physics-rich events that will ultimately be recorded when data-taking starts in 2007. To achieve this two levels of triggers are foreseen which have progressively more time to perform more sophisticated pattern recognition on each event. The final level will take place in software via algorithms running on large (~2000 node) computer farms. An efficient and robust network must be devised to transport data safely from the LHCb detectors to the computing farms fast enough for these algorithms to run.

We (colleagues at UCD and myself), used MAP2 to provide a hardware simulation of data flow in the LHCb software trigger system. We used MAP2 as a testbed to examine data transfer speeds across a simple network topology.

More information