Bulletin of the American Physical Society
2007 APS April Meeting
Volume 52, Number 3
Saturday–Tuesday, April 14–17, 2007; Jacksonville, Florida
Session M13: Theory I 
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Sponsoring Units: DPF Chair: JoAnne Hewett, Stanford Linear Accelerator Center Room: Hyatt Regency Jacksonville Riverfront City Terrace 9 
Sunday, April 15, 2007 3:15PM  3:27PM 
M13.00001: Chiral Lagrangian with Heavy QuarkDiquark Symmetry Jie Hu, Thomas Mehen We construct a chiral Lagrangian for doubly heavy baryons and heavy mesons that is invariant under heavy quarkdiquark symmetry at leading order and includes the leading $O(1/m_Q)$ symmetry violating operators. The theory is used to predict the electromagnetic decay width of the $J=\frac{3}{2}$ member of the ground state doubly heavy baryon doublet. Numerical estimates are provided for doubly charm baryons. We also calculate chiral corrections to doubly heavy baryon masses and strong decay widths of low lying excited doubly heavy baryons. [Preview Abstract] 
Sunday, April 15, 2007 3:27PM  3:39PM 
M13.00002: Hamiltonian approach to YangMills theories in 2+1 dimensions: glueball and meson mass spectra. Alexandr Yelnikov, Robert G. Leigh, Djordje Minic I will present a summary of the recently announced analytic computation of the spectrum of lowest spin glueballs and associated Regge trajectories in the planar limit of pure YangMills theory in 2+1 dimensions. I will also discuss the analytic approach to the spectrum of QCD in 2+1 dimensions, as well as preliminary analytic treatment of pure YangMills theory in 3+1 dimensions. The emphasis will be placed on the computations of new nontrivial ground state wave functionals in these cases and close comparisons with the available large N lattice data. [Preview Abstract] 

M13.00003: ABSTRACT WITHDRAWN 
Sunday, April 15, 2007 3:51PM  4:03PM 
M13.00004: Higgs mechanism with nonparallel vacuum and physical field Jaime Besprosvany Spontaneous symmmetry breaking of scalar potentials provide degenerate vacuum configurations of fields. We investigate the Higgs mechanism in gauge theories with a nonalligned physical field with the vacuum. We calculate the effective potential with corrections to first order in the coupling constant of a renormalizable fourthpower scalar potential, including a derived thirdpower contribution. We find that these non alligned configurations are possible for potentials with non zero secondpower term. We discuss applications of this mechanism in standardmodel extensions that provide CP violating phase generation, and restrictions on the mass of the Higgs particle. [Preview Abstract] 

M13.00005: ABSTRACT WITHDRAWN 
Sunday, April 15, 2007 4:15PM  4:27PM 
M13.00006: Soft Leptogenesis in LeftRight Symmetric Models Abdel Bachri, Babu Kaladi We analyze lepton asymmetry induced in the right handed sneutrino ${\tilde \nu}_{R1}{\tilde \nu}_{R1}^{\dagger}$ mixing and decay through $W_R$ exchange in a class of leftright symmetric models (SUSYLR). Usual soft leptogenesis scenario requires small $B$term and relatively low heavy neutrino mass. We include the effect of SUSY breaking contribution on the breaking parameters; and compute r.h.n soft parameters to show that Soft Leptogenesis mechanism implemented in SUSYLR framework leads to adequate baryon number asymmetry in the universe with natural values of Soft breaking parameters; $B\sim 100~{\rm GeV}$. In this class of models; $M_{{\tilde \nu}_{R1}}\sim M_{W_R}\sim (10^9~~10^{10})~\mbox {GeV}$, is not required to be small as it is in the original idea. There is no excessive CP violation in these models even when we assume universality of parameters. [Preview Abstract] 
Sunday, April 15, 2007 4:27PM  4:39PM 
M13.00007: New Dark Matter Candidate in a U(1)$'$ Model Salah Nasri, HyeSung Lee, Kanstantin Matchev The Minimal Supersymmetric Standard Model (MSSM) suffers from the finetuning of the $\mu$ parameter in the superpotential. This is called the ``$\mu$ problem'' in the MSSM. The $U(1)'$extended MSSM (UMSSM) is a natural extension without the $\mu$problem or domain wall problem. With a new gauge boson ($Z'$), we revive the possibility for the sneutrino to be the dark matter including the constraints on the relic density from WMAP, bounds on $Z'$ mass from Tevatron and BBN and the constraint on the elastic scattering cross section off nucelon from CDMSII. [Preview Abstract] 
Sunday, April 15, 2007 4:39PM  4:51PM 
M13.00008: Measurement of Higgs SelfCoupling Constant in Standard Model Firdevs Duru After the discovery of Higgs Boson, its properties will gain importance. One of the most critical properties of Higgs is its selfcoupling constant, $\lambda $, which is necessary to understand the shape of the potential. In order to calculate $\lambda $, the observation of Higgs pair production is necessary. In the Large Hadron Collider (LHC) experiment, there will be different ways of producing Higgs pairs, such as gluon fusion, WW or ZZ fusion, W or Zstrahlung. We use the gluongluon fusion Standard Model (SM) sample of gg $>$ HH $>$ (W$^{+}$ W$^{})$ (W$^{+}$ W$^{})>$ (j j l$^{\pm } \quad \upsilon )$ (j j l$^{\mbox{'}\pm } \quad \upsilon )$, where l and l$^{\mbox{'}}$ are any combination of electrons and muons. Also, the two background processes, W$^{\pm }$ W$^{+}$ W$^{}$ j j and ttbarW$^{\pm }$, which have the largest contribution are used. These signal and background events have been simulated in CMS detector. We report the details of a Higgs selfcoupling constant measurement study in the CMS experiment, and compare to the earlier studies. [Preview Abstract] 
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