Bulletin of the American Physical Society
81st Annual Meeting of the APS Southeastern Section
Volume 59, Number 18
Wednesday–Saturday, November 12–15, 2014; Columbia, South Carolina
Session GC: High Energy Physics IV |
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Chair: Robert Group, University of Virginia Room: Richland I |
Friday, November 14, 2014 8:30AM - 8:42AM |
GC.00001: sQED Interpolated between the Instant Form Dynamics and the Light-front Dynamics Ziyue Li, Alfredo Suzuki, Chueng-Ryong Ji We present the electromagnetic gauge field interpolation between the instant form and the front form of the relativistic Hamiltonian dynamics and calculate the scattering amplitude in case of the electromagnetic gauge field theory with the scalar fermion fields known as the sQED theory. We find that the Coulomb gauge in the instant form dynamics (IFD) and the light-front gauge in the front form dynamics, or the light-front dynamics (LFD), are naturally linked by the unified general physical gauge that interpolates between these two forms of dynamics. We derive the spin-1 polarization vector for the photon that can be generally applicable for any interpolation angle. Corresponding photon propagator for an arbitrary interpolation angle is also found. The calculation of the lowest-order scattering processes for an arbitrary interpolation angle in sQED shows the same J-shape correlation that was found in the simpler scalar field theory. We discuss the singular behavior of this correlation in conjunction with the zero mode issue in the LFD. [Preview Abstract] |
Friday, November 14, 2014 8:42AM - 8:54AM |
GC.00002: A New View of PMNS Matrix and Charged Lepton Mass Matrix in the Model of Electroweak-scale Right-handed Neutrino Trinh Le, Hung Pham We present a model of neutrino masses within the framework of EW-$\nu_R$ model in which the experimentally desired form of the PMNS matrix is obtained by applying an A(4) symmetry to the \emph{Higgs singlet sector} responsible for the neutrino Dirac mass matrix. This mechanism naturally avoids potential conflict with the LHC data which severely constrained the Higgs doublet sector. Moreover, by making a simple ansatz we extract $\mathcal{M}_l {\mathcal{M}_l}^\dagger$ for the charged lepton sector. [Preview Abstract] |
Friday, November 14, 2014 8:54AM - 9:06AM |
GC.00003: Search For New Physics at the BABAR Experiment Romulus Godang Using a full BABAR data sample of 426/fb, we present measurements of R(D) and R(D*) where R(D) $=$ BR(D tau nu)/BR(D lepton nu) and R(D*) $=$ BR(D* tau nu)/BR(D* lepton nu). The lepton is either electron or muon. These ratios of R(D) and R(D*) exceed the Standard Model predictions by 2.0 sigma and 2.7 sigma, respectively. The combined results disagree with the Standard Model prediction at the level of 3.4 sigma. These ratios are sensitive to New Physics (NP) contributions in the form of a charged Higgs Boson. [Preview Abstract] |
Friday, November 14, 2014 9:06AM - 9:18AM |
GC.00004: Studies of the X(3872) Arman Margaryan, Roxanne Springer The $X(3872)$ is an unusual charmonium-like state that lies very close to the $D^0$ $\bar{D}^{0*}$ threshold. Heavy hadron chiral perturbation theory (HH$\chi$PT) and the effective field theory developed for the $X(3872)$ (XEFT) are applied to processes involving the $X(3872)$ and a photon. The existence of the decay mode $X(3872)\rightarrow J/\psi\gamma $ demands a $C=+1$ assignment for the $X(3872)$. The invariant mass distribution in the decay $X(3872)\rightarrow J/\psi \pi^{+}\pi^{-}$ is consistent only with the $J^{PC}=1^{++}$ quantum number assignment for the $X(3872)$ particle. This suggests that the $X(3872)$ wavefunction may be dominated by long distance physics, hence coupling strongly with a ($D^0\bar{D}^{0*}+\bar{D}^0D^{0*}$) molecular bound state. Here we present some differential cross sections involving the $X(3872)$. They depend on the angle between the final photon momentum and initial or final particle polarization vectors. These angular distributions may distinguish between long distance and short distance components of the $X(3872)$, so that future measurements may provide information about the structure of the $X(3872)$. [Preview Abstract] |
Friday, November 14, 2014 9:18AM - 9:30AM |
GC.00005: Study of $B^\pm \to \pi^\pm \pi^\mp \pi^\pm$ at Belle Yao Li Decays of B mesons to three-body charmless final states probe the properties of the weak interaction through their dependence on the complex quark couplings in the CKM matrix. They also test dynamical models for hadronic B decays. Based on a sample of $ (771.581\pm 10.566) \times 10^6 $ $B\bar B$ pairs collected by the Belle experiment at $\sqrt{s} = 10.58 GeV$, we present a study of direct CP nonconservation in $B^\pm \to \pi^\pm \pi^+ \pi^-$. [Preview Abstract] |
Friday, November 14, 2014 9:30AM - 9:42AM |
GC.00006: The Latest Oscillation Results from the Daya Bay Reactor Neutrino Experiment Jonathan Link The Daya Bay reactor neutrino experiment is one of the three current-generation short-baseline reactor neutrino experiments designed to measure the neutrino mixing angle $\theta_{13}$. This talk will give a review the Daya Bay experiment, present the latest oscillation analysis including results on sin$^{2}$2$\theta_{13}$ and $\Delta $m$_{ee}^{2}$, and discuss the current status and future prospects with an emphasis on the determination of precision oscillation parameters. [Preview Abstract] |
Friday, November 14, 2014 9:42AM - 9:54AM |
GC.00007: The signal strength of CP-odd spin zero state in the model of electroweak scaled right-handed neutrinos at LHC Vinh Hoang, Hung Pham, Ajinkya Kamat We analyze and compute the signal strength of one CP-odd spin zero state in the model of electroweak scaled right-handed neutrinos ($EW\nu_R$) model. The signal strength is investigated in various major channels at LHC, $\gamma\gamma$, VV, and b$\bar{b}$. With the high statistic in $\gamma\gamma$ channel, we can have an exclusive region, $130 \div 150 \;GeV$ for this CP-odd scalar. We also show an interesting decay mode which mimics WW process. From that, an upper limit for coupling of a singlet with right-handed doublets is imposed. [Preview Abstract] |
Friday, November 14, 2014 9:54AM - 10:06AM |
GC.00008: Search for B$^0 \rightarrow l^+ l^-$ at Belle Kimberly Williams The decay modes $B^{0}\rightarrow l^{+}l^{-}$ are a group of very rare particle decays presenting an important test to the Standard Model. They could show evidence of physics outside the Standard model such as lepton family number violations and probe the weak interaction theory. Based on a sample of $ (771.581\pm 10.566) \times 10^6 $ $B\bar B$ pairs collected by the Belle experiment at $\sqrt{s} = 10.58 GeV$, we present a study of the rare decay $B^{0}\rightarrow l^{+}l^{-}$. [Preview Abstract] |
Friday, November 14, 2014 10:06AM - 10:18AM |
GC.00009: Potential Mirror Matter Effect on the Neutron Lifetime Louis Varriano, Yuri Kamyshkov, Zurab Berezhiani A precise measurement of the neutron lifetime is important for Big Bang nucleosynthesis calculations. The history of neutron lifetime measurements has demonstrated impressive continuous improvements of the experimental techniques and of the accuracy. However, two most precise recent measurements performed by different techniques differ by about 3 standard deviations. This difference of 9.2 seconds can possibly be resolved by future experiments, but it also can lead to an interpretation of a new effect. This research attempts to explain this difference by a mirror matter as dark matter effect present in these experiments. Both mirror matter and regular matter can have similar properties and self-interactions and can interact gravitationally with each other, thus providing evidence of the existence of dark matter. However mirror matter does not couple to the regular matter by our other Standard Model interactions. Additional interactions can exist, providing mixing of regular matter neutral states, like the neutron, with mirror components with small probability. This work first estimates the density of mirror matter particles needed to explain the difference between measurements of the neutron lifetime. Working under a model that describes an accumulation of mirror matter particles within the Earth, this resulting density is then evaluated for its reasonableness. [Preview Abstract] |
Friday, November 14, 2014 10:18AM - 10:30AM |
GC.00010: What can Electroweak-scale Right-handed Neutrino tell us about the Higgs sector at LHC? Ajinkya Kamat, Pham Hung, Vinh Hoang In the electroweak scale right handed neutrino (EW$\nu_R$) model, a right handed neutrino can naturally acquire a mass around the electroweak scale. A minimal extension to this model can also accommodate a CP-even Higgs boson with a mass around 126 GeV, in addition to a rich spectrum of BSM scalars and mirror fermions. The 126 GeV Standard Model-like Higgs boson discovered and studied at CMS and ATLAS experiments, exhibits a dual-like nature in the framework of this model. Also, the BSM scalars in this model can potentially be searched for at the LHC. [Preview Abstract] |
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