Physical Review D

We reanalyze the two- and three-pion mass distributions in the decays X(3872)→ρJ/ψ and X(3872)→ωJ/ψ and argue that the present data favor the 1⁺⁺ assignment for the quantum numbers of the X.

Data from the Liquid Scintillator Neutrino Detector and Mini-Booster Neutrino experiments, and the revised expectations of the antineutrino flux from nuclear reactors suggest the existence of eV-mass sterile neutrinos. The 3+2 and 1+3+1 scenarios accommodate all relevant short-baseline neutrino data...

Current results of the MiniBooNE experiment show excess events that indicate neutrino oscillations, but only if one goes beyond the standard 3 family scenario. Recently a different explanation of the events has been given, not in terms of oscillations but by the production and decay of a massive ste...

We present a search for new phenomena in events with two reconstructed Z bosons and large missing transverse momentum, sensitive to processes pp̅ →X₂X₂→ZZX₁X₁, where X₂ is an unstable particle decaying as X₂→ZX₁ and X₁ is undetected. The particles X₁ and X₂ may be, among other possibilities, ...

We present a measurement of the relative branching fraction, R_f0/ϕ, of B_s⁰→J/ψf₀(980), with f₀(980)→π⁺π^-, to the process B_s⁰→J/ψϕ, with ϕ→K⁺K^-. The J/ψf₀(980) final state corresponds to a CP-odd eigenstate of B_s⁰ that could be of interest in future studies of CP violation. Using 8  fb^-1 of data reco...

We present a search for semileptonic B decays to the charmed baryon Λ_c⁺ based on 420  fb^-1 of data collected at the Υ(4S) resonance with the BABAR detector at the PEP-II e⁺e^- storage rings. By fully reconstructing the recoiling B in a hadronic decay mode, we reduce non-B backgrounds and determine th...

We report a measurement of the inclusive semileptonic branching fraction of the B_s meson using data collected with the BABAR detector in the center-of-mass energy region above the Υ(4S) resonance. We use the inclusive yield of ϕ mesons and the ϕ yield in association with a high-momentum lepton to pe...

In this note, we study the coupling of the technidilaton to the weak bosons. We consider two cases: (1) The dilaton directly couples to the weak bosons in a similar way as in the standard model. (2) The coupling in question is effectively induced only through the technifermion loops. In both cases, ...

We show that the discovery channel for dark matter (DM) production at colliders can be through flavor violating interactions resulting in a novel signature of a single top and large missing transverse energy. We discuss several examples where the production of DM is dominated by flavor violating cou...

We examine the effect of the difference in nuclear interactions of K⁰ and K̅ ⁰ mesons on the measurement of CP asymmetry for experiments at e⁺e^- colliders—charm and B-meson factories. We find that this effect on CP asymmetry can be as large as 0.3%, and therefore sufficiently significant in i...

The OPERA Collaboration has reported the observation of superluminal muon neutrinos, whose speed v_ν exceeds that of light c, with (v_ν-c)/c≃2.5×10^-5. In a recent work, Cohen and Glashow have refuted this claim by noting that such neutrinos will lose energy, by pair emission of particles, at unaccepta...

If the observation by OPERA of apparently superluminal neutrinos is correct, the Lagrangian for second-generation leptons must break Lorentz invariance. We calculate the effects of an energy-independent change in the neutrino speed on another observable, the charged pion decay rate. The rate decreas...

The Atlas and CMS groups have both reported an excess of events in the WW^*→ℓ⁺ℓ^-+E_T^miss search channel, which could be the first evidence for the Higgs boson. In the MSSM, the lightest SUSY Higgs scalar h is expected to occur with mass m_h≲135  GeV, depending on the range of SUSY parameters scanned ov...

We report the first reconstruction in hadron collisions of the suppressed decays B^-→D(→K⁺π^-)K^- and B^-→D(→K⁺π^-)π^-, sensitive to the Cabibbo-Kobayashi-Maskawa phase γ, using data from 7  fb^-1 of integrated luminosity collected by the CDF II detector at the Tevatron collider. We reconstruct a signal fo...

We show that bound states moving in a finite periodic volume have an energy correction which is topological in origin and universal in character. The topological volume corrections contain information about the number and mass of the constituents of the bound states. These results have broad applica...

The processes η_c^′→ρ⁰ρ⁰, K^*0K̅ ^*0, and ϕϕ are searched for using a sample of 1.06×10⁸ ψ^′ events collected with the BESIII detector at the BEPCII collider. No signals are observed in any of the three final states. The upper limits on the decay branching fractions are determined to be B(η_c^′→ρ⁰ρ⁰...

The calculation of scattering amplitudes in Yang-Mills theory at loop level is important for the analysis of background processes at particle colliders as well as our understanding of perturbation theory at the quantum level. We present tools to derive relations for especially one-loop amplitudes, a...

Motivated by the recent interest in light weakly interacting massive particles (WIMPs) of mass ∼O(10  GeV/c²), an extension of the elastic, spin-independent, WIMP-nucleon cross-section limits resulting from the CRESST-II commissioning run (2007) are presented. Previously, these data were used to set...

We show that the area-angular-momentum inequality A≥8π|J| holds for axially symmetric closed outermost stably marginally trapped surfaces. These are horizon sections (in particular, apparent horizons) contained in otherwise generic non-necessarily axisymmetric black hole spacetimes, with a non-negat...

C-theory provides a unified framework to study metric, metric-affine and more general theories of gravity. In the vacuum weak-field limit of these theories, the parameterized post-Newtonian parameters β and γ can differ from their general relativistic values. However, there are several classes of mo...

Polarization of light rotates in a gravitational field. The accrued phase is operationally meaningful only with respect to a local polarization basis. In stationary space-times, we construct local reference frames that allow us to isolate the Machian gravimagnetic effect from the geodetic (mass) con...

Cold dark matter in the Milky Way halo may have structure defined by flows with low velocity dispersion. The Axion Dark Matter eXperiment high resolution channel is especially sensitive to axions in such low velocity dispersion flows. Results from a combined power spectra analysis of the high resolu...

We analyze the a set of 17 rotation curves of low surface brightness (LSB) galaxies from The HI Nearby Galaxy Survey (THINGS) with different mass models to study the core structure and to determine a phase transition energy scale (E_c) between hot and cold dark matter, due to nonperturbative effects ...

We consider a simple model of cosmological collapse driven by canonical fields with exponential potentials. We generalize the two-field ekpyrotic collapse to consider nonorthogonal or tilted potentials and give the general condition for isocurvature field fluctuations to have a scale-invariant spect...

We study energy transport by asymmetric dark matter (ADM) in very low-mass stars and brown dwarfs. Our motivation is to explore astrophysical signatures of ADM, which may not otherwise be amenable to indirect dark matter searches. In viable models, the additional cooling of low-mass stellar cores ca...

We consider the perturbative (weak field) limit of the small x QCD evolution equation for the quadrupole, the normalized trace of four Wilson lines in the fundamental representation, which appears in dihadron angular correlation in high-energy collisions. We linearize the quadrupole evolution equati...

Partial decay widths of the heavy-light mesons, D, D_s, B, and B_s, emitting one chiral particle (π or K) are evaluated in the framework of a relativistic potential model. Decay amplitudes are calculated by keeping the Lorentz invariance as far as possible and use has been made of the Lorentz-boosted ...

We present a systematic discussion of Λ_b→Λ transition form factors in the framework of soft-collinear effective theory (SCET). The universal soft form factor, which enters the symmetry relations in the limit of large recoil energy, is calculated from a sum-rule analysis of a suitable SCET correlatio...

In the framework of the k_T-factorization approach, the production and polarization of prompt J/ψ mesons in pp collisions at the LHC energy √s=7  TeV is studied. Both the direct production mechanism as well as feed-down contributions from χ_c1, χ_c2, and ψ^′ decays are taken into account. Our considerat...

We study some properties of nucleons with a simplified version of a Faddeev equation at finite temperature and baryon chemical potential in the framework of the Nambu–Jona-Lasinio model. By taking diquark-quark bubble summation, we constructed the nucleon propagator and calculated the dynamical mass...

We report on a measurement of CP-violating asymmetries (A_CP) in the Cabibbo-suppressed D⁰→π⁺π^- and D⁰→K⁺K^- decays reconstructed in a data sample corresponding to 5.9  fb^-1 of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D^*+→D⁰π⁺ to identify t...

A maximum entropy principle was proven in my recent paper [S. Gao, Phys. Rev. D 84 104023 (2011)]. I show that a crucial condition p=p(ρ) used in the proof can be removed and the conclusion remains valid.

A well-known connection between n strings winding around a circle and permutations of n objects plays a fundamental role in the string theory of large N two-dimensional Yang-Mills theory and elsewhere in topological and physical string theories. Basic questions in the enumeration of Feynman graphs c...

In this note, we study a large class of four-dimensional R-symmetric theories, and we describe a new quantity τ_U which is well defined in these theories. Furthermore, we conjecture that this quantity is larger in the ultraviolet (UV) than in the infrared (IR), i.e., that τ_U^UV>τ_U^IR. While we do no...

Recently, the possibility of so-called twinlike field theories has been demonstrated, that is, of different field theories which share the same topological defect solution with the same energy density. Further, purely algebraic conditions have been derived which the corresponding Lagrangians have to...

Radiative corrections to the decay rate of charged fermions caused by the presence of a thermal bath of photons are calculated in the limit when temperatures are below the masses of all charged particles involved. The cancellation of finite-temperature infrared divergences in the decay rate is descr...

There are several instances where quantum anomalies of continuous and discrete classical symmetries play an important role in fundamental physics. Examples come from chiral anomalies in the Standard Model of fundamental interactions and gravitational anomalies in string theories. Their generic origi...

We give a systematic treatment of a spin 1/2 particle in a combined electromagnetic field and a weak gravitational field that is produced by a slowly moving matter source. This paper continues previous work on a spin zero particle, but it is largely self-contained and may serve as an introduction to...

We discuss the Hawking temperature of near-equilibrium black holes using a semiclassical analysis. We introduce a useful expansion method for slowly evolving spacetime, and evaluate the Bogoliubov coefficients using the saddle point approximation. For a spacetime whose evolution is sufficiently slow...

A generalization to the theory of massive gravity is presented which includes three dynamical metrics. It is shown that at the linear level, the theory predicts a massless spin-2 field which is decoupled from the other two gravitons, which are massive and interacting. In this regime, the matter shou...

It is expected that black holes are formed dynamically under gravitational collapses and approach stationary states. In this paper, we show that the asymptotic Killing vector at late time should exist on the horizon and then that it can be extended outside of black holes under the assumption of the ...

Interacting massive fields with m>dH/2 in d+1 dimensional de Sitter space are fundamentally unstable. Scalar fields in this mass range can decay to themselves. This process (which is kinematically forbidden in Minkowski space) can lead to an important change to the propagator and the physics of t...

Using the effective-one-body (EOB) formalism and a time-domain Teukolsky code, we generate inspiral, merger, and ringdown waveforms in the small-mass-ratio limit. We use EOB inspiral and plunge trajectories to build the Teukolsky-equation source term, and compute full coalescence waveforms for a ran...

We analyze the physical properties of boson stars, which possess counterparts in flat space-time, Q-balls. Applying a stability analysis via catastrophe theory, we show that the families of rotating and nonrotating boson stars exhibit two stable regions, separated by an unstable region. Analogous to...

Recently, a class of theories of massive gravity has been shown to be ghost-free. We study the spherically symmetric solutions in the bigravity formulation of such theories. In general, the solutions admit both a Lorentz-invariant and a Lorentz-breaking asymptotically flat behavior and also fall int...

Inflation typically predicts a quasiscale-invariant spectrum of gravitational waves. In models of slow-roll inflation, the amplitude of such a background is too small to allow direct detection without a dedicated space-based experiment such as the proposed BBO or DECIGO. In this paper we note that p...

We introduce the generalized Lorentz gauge condition in the theory of quantum electrodynamics into the general vector-tensor theories of gravity. Then we explore the cosmic evolution and the static, spherically symmetric solution of the four dimensional vector field with the generalized Lorenz gauge...

We have recently shown [ S. A. Kim, A. R. Liddle and D. Seery Phys. Rev. Lett. 105 181302 (2010)] that multifield axion N-flation can lead to observable non-Gaussianity in much of its parameter range, with the assisted-inflation mechanism ensuring that the density perturbations are sufficiently clo...

We discuss the interplay between spectral shape and detector response beyond a simple E^-2 neutrino flux at neutrino telescopes, using the example of time-integrated point source searches using IceCube-40 data. We use a self-consistent model for the neutrino production, in which protons interact with...