Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session Q12: Invited Session: Non-perturbative Physics in the Standard Model and Beyond Explored by Markov Chain Monte Carlo (MCMC) Calculations |
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Sponsoring Units: DCOMP DNP Chair: Alexei Bazavov, Brookhaven National Laboratory Room: Grand Hall East A/B |
Monday, April 2, 2012 10:45AM - 11:21AM |
Q12.00001: Flavor physics and CKM matrix elements Invited Speaker: Ran Zhou Flavor physics plays an important role in checking the Standard Model and searching for new physics. Flavor physics calculations typically require hadronic matrix elements that require non-perturbative understanding of QCD. Lattice QCD now provides the means to accurately calculate these matrix elements from first principles. In this talk, I will first introduce lattice methods for calculation of hadronic matrix elements, and their application to flavor physics. Different lattice actions and their associated errors will be reviewed. Then the lattice results on B, Bs, D and Ds decay constants will be summarized and compared with experimental values. Next, I will focus on the the lattice determination of CKM matrix elements through B,D and K meson semileptonic decays. Finally, I will talk about the lattice study of the $B \rightarrow K/K^{\star}l\bar{l}$ process and it's implication for the search for new physics. [Preview Abstract] |
Monday, April 2, 2012 11:21AM - 11:57AM |
Q12.00002: Deconfined phase of QCD and thermodynamics of the quark-gluon plasma Invited Speaker: Ludmila Levkova The quark-gluon plasma is a state of matter which forms at very high temperatures or densities. It is believed that up to microseconds after the big bang the quark-gluon plasma was a dominant component of the Universe. This state of matter is recreated in heavy-ion collision experiments (such as RHIC and ALICE) which study its formation and transition to ordinary matter. Knowledge of the properties of the quark-gluon plasma is essential to our understanding of the particle spectra produced in these experiments, and also for phenomena related to cosmology and compact star formation. I present recent results for the thermodynamics of the quark-gluon plasma from lattice QCD, which is the only nonperturbative method currently allowing its first principle determination. [Preview Abstract] |
Monday, April 2, 2012 11:57AM - 12:33PM |
Q12.00003: Physics Beyond the Standard Model, search for non-perturbative models of electroweak symmetry breaking Invited Speaker: Michael Cheng The Standard Model provides an elegant mechanism for electroweak symmetry breaking (EWSB) via the introduction of a scalar Higgs field. However, the Standard Model Higgs mechanism is not the only way to explain EWSB. A class of models, broadly known as Technicolor, postulates the existence of a new strongly-interacting gauge sector at the TeV scale, coupled to the Standard Model through technifermions charged under electroweak. In technicolor, the spontaneous breaking of chiral symmetry triggers EWSB, with the resulting Goldstone bosons ``eaten'' by the massive W, Z gauge bosons. Because they are strongly-coupled and inherently non-perturbative, numerical lattice gauge theory provides an ideal arena in which technicolor can be explored. The maturation of lattice methods and availability of sufficient computing power has spurred the investigation of technicolor using lattice gauge theory techniques, in particular one variant known as ``walking'' technicolor. A technicolor model that resembles QCD is problematic that it does not satisfy the constraints of precision electro-weak observables, most notably those encapsulated by the Peskin-Takeuchi parameters, as well as the contraints on flavor-changing neutral currents. Walking technicolor is a class of models where the theory is near-conformal, \textit{i.e.} the gauge coupling runs very slowly (``walks'') over some large range of energy scales. This walking behavior produces a large separation of scales between the natural cut-off for the theory and the EWSB scale, allowing one to naturally generate fermion masses without violating contrainsts on flavor-changing neutral currents. The dynamics of walking theories may also allow it to satisfy the bounds on the Peskin-Takeuchi parameters. We discuss the results of recent lattice calculations that explore the properties of walking technicolor models and the its implications on possible physics beyond the Standard Model. [Preview Abstract] |
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