14061353
Supertubes connecting D 4 branes
We find and explore a class of dyonic instanton solutions which can be identified as the supertubes connecting two D4 branes. They correspond to a single monopole string and a pair of monopole-antimonopole strings from the worldvolume view point of D4 branes. 1 Introduction Recently there has been a considerable study of the so called supertube solutions. Originally Mateos and Townsend constructed supersymmetric configurations of D2-D0-F1 branes where D2 brane forms a single cylinder with D-particles and F-strings melted in[1]. The corresponding configurations in the matrix model have been found also[2, 3]. As a limit of the elliptic deformation of circular tubes, flat supersymmetric brane antibrane configurations are realized[4] and the wouldbe tachyons present in the ordinary brane-antibrane system become massless exhibiting the stability of the system[5]. In fact the cross sectional shape of the tubes is shown to be arbitrary in the transverse eight dimensions[6]. More recently, the DBI action has been explored to find the supersymmetric configuration for D2 supertubes ending on a D4 brane[7]. The higher dimensional analogue has In this note we are interested in tubular D2 connecting two D4 branes separated, say, in x 9 direction. As argued in Ref. [7], all the constituents of supertubes, i.e. D0, F1 and D2, may end on D4 branes and, hence, such configuration should be consistent with supersymmetries. Viewed from the worldvolume of D4, D0 appears as an instanton generating selfdual field strength and F-string extended along x 9 works as a localized electric source. One direction of D2 is extended in x 9 and the other spatial direction will in general form a curve in D4 worldvolume. Since this curve is magnetically charged, one may call it as a magnetic string from the view point of the D4 worldvolume. The instantons preserve only half of sixteen supersymmetries and F1/D2 breaks further half, so only 1/8 of 32 supersymmetries remain in general. In this U(2) context of two D4 branes, one is ultimately interested in magnetic strings where the shape of curve on D4 is arbitrary, which correspond to tubes of arbitrary cross sections. However such general configurations seem involved for reasons described below. Therefore we shall focus on the monopole and antimonopole strings corresponding to supersymmetric flat D2-D2 connecting two D4 branes. This supersymmetric configuration is composed of a monopole string and an antimonopole string. Simpler situation arises if one considers just one flat D2 (or a …
119199828
The general M5-brane superconformal index
We calculate and study the general superconformal index for the 6d U(N) (2,0) theory with four chemical potentials, from the indices of gauge theories on CP^2 x R. Our index agrees with the large N supergravity index on AdS_7 x S^4 at low energies, and also yields the negative 'Casimir energy' with an N^3 scaling which was recently calculated from a QFT on S^5. Our approach also suggests a systematic study of the (1,0) superconformal indices.
7063414
Mass-Deformed Bagger-Lambert Theory and its BPS Objects
We find a 16-supersymmetric mass-deformed Bagger-Lambert theory with SO(4)xSO(4) global R symmetry. The R charge plays the role of the noncentral term in the superalgebra. This theory has one symmetric vacuum and two inequivalent broken sectors of vacua. Each sector of the broken symmetry has SO(4) geometry. We find the 1/2 BPS domain walls connecting the symmetric phase and any broken phase, and 1/4 BPS supertubelike objects, which may appear as anyonic q-balls in the symmetric phase or vortices in the broken phase. We also discuss mass deformations, which reduce the number of supersymmetries.
11205361
The CP(n) model on noncommutative plane
We construct the consistent CP(n) model on noncommutative plane. The Bogomolny bound on the energy is saturated by (anti-)self-dual solitons with integer topological charge, which is independent of their scaling and orientation. This integer quantization is satisfied for our general solutions, which turns out regular everywhere. We discuss the possible implication of our result to the instanton physics in Yang–Mills theories on noncommutative R4.
119250832
New BPS configurations of BMN matrix theory
We explore the 1/2 BPS configurations in BMN matrix theory with SO(3) angular momentum of SO(3) × SO(6) symmetry. The fluctuation analysis of the BPS configurations near the abelian solutions and also the fuzzy two sphere vacua reveals how nonabelian BPS configurations emerge. Especially the irreducible nonabelian configurations seem to have the maximal angular momentum of order N3, beyond which they collapse to abelian ones. We also find some new BPS configurations explicitly.
29030259
Magnetic monopole with Wilson-loop symmetry breaking.
A nonsingular classical magnetic-monopole solution is obtained in a theory with Wilson-loop symmetry breaking. The solution is used to elucidate the quantization rules governing the magnetic charge, which are more restrictive than those for Higgs monopoles.
119361427
Exploring the charged Higgs bosons in the left-right symmetric model
We explore constraints on the charged Higgs sector in the left-right symmetric model from the present experimental data. Because of the different Yukawa structure, the allowed parameter space of the charged Higgs boson in the LR model is different from that of the two Higgs doublet model. We find that the constraint from t{yields}bH{sup {+-}} decay at Tevatron is most significant, while B{yields}{tau}{nu} decay could provide no constraint on the LR model. Bounds from e{sup -}e{sup +}{yields}H{sup -}H{sup +} process at LEP are similar to those in the two Higgs doublet model.
203614509
Ju n 20 08 Production of the charged Higgs bosons at the CERN Large Hadron Collider in the left-right symmetric model
Search of Higgs bosons is the primary goal of the CERN Large Hadron Collider (LHC). In the standard model (SM), one neutral Higgs boson exists as a result of the electroweak symmetry breaking (EWSB), of which mass is not predicted in the theoretical framework. The discovery potential for the SM Higgs boson at the LHC will reach to about 1 TeV with the integrated luminosity of 100 fb. It implies that the SM Higgs boson will be discovered at the LHC at more than 5-σ level. In many models of new physics beyond the SM, however, more symmetries are involved and the Higgs sector should be extended to break larger symmetry. Signatures of an extended Higgs sector would provide direct evidence for new physics beyond the SM. Models with an extended Higgs sector often contain charged Higgs bosons H, which do not exist within the SM. The two Higgs doublet model (2HD) is one of the simplest extension of the SM and the Higgs structure of the minimal supersymmetric standard model (MSSM). There are three neutral Higgs bosons, h, H, A and a pair of charged Higgs bosons H in the 2HD model and the MSSM. Hereafter the 2HD model and the MSSM are just called the 2HD model generically. If the H bosons are lighter than the top quark, they can be produced in the top quark decay processes t → bH. Search for H from top quark decays in the 2HD model has been performed at Tevatron and no evidence for H production is found [1]. The CERN Large Electron Positron Collider (LEP) has also examined the charged Higgs bosons up to √ s = 200 GeV through the pair production of H to present the lower bound of the charged Higgs boson mass [2, 3]. Recent measurement of Br(B → τν) by Belle provides indirect constraints on the charged Higgs bosons in the 2HD model via the annihilation diagram mediated by H boson [4, 5]. The absence of the observed charged Higgs boson so far derives constraints on (tanβ,mH±) parameter space for the 2HD model. If the charged Higgs bosons are heavier than the top quark, we have to observe the direct production at hadron colliders. The most promising channel for the charged Higgs boson production at the LHC is the gb → tH process which has been extensively studied [6, 7, 8, 9]. The Drell-Yan mechanism gg, qq̄ → HH and the associated production with a W boson, qq̄ → HW are suppressed due to the weak couplings, low quark luminosity, and loop suppression. The discovery potential of the H bosons at the LHC has been studied by ATLAS [10] and CMS [11] groups. Expected to be discovered is a MSSM charged Higgs boson as heavy as 1 TeV at the 5-σ confidence level, or may be excluded up to the mass of 1.5 TeV at 95 % C.L. at the LHC with the MSSM radiative corrections [9]. The left-right (LR) symmetric model based on the gauge symmetry, SU(2)L× SU(2)R× U(1)B−L, usually contain a bidoublet Higgs field φ(2, 2̄, 0) for the EWSB and the Yukawa couplings represented by
119332767
Analysis of Low-Energy Pion Spectra
The transverse mass spectra and the rapidity distributions of $\pi^+$ and $\pi^-$ in Au-Au collisions at 2, 4, 6, and 8 GeV$\cdot$A by E895 collaboration are fitted using an elliptically expanding fireball model with the contribution from the resonance decays and the final state Coulomb interaction. The ratio of the total number of produced $\pi^-$ and $\pi^+$ is used to fit the data. The resulting freeze-out temperature is rather low($T_f < 60$ MeV) with large transverse flow and thus resonance contribution is very small. The difference in the shape of $m_t$ spectra of the oppositely charged pions are found to be due to the Coulomb interaction of the pions.
119242266
Stringy unification of type IIA and IIB supergravities under N=2 D=10 supersymmetric double field theory
Abstract To the full order in fermions, we construct D = 10 type II supersymmetric double field theory. We spell the precise N = 2 supersymmetry transformation rules as for 32 supercharges. The constructed action unifies type IIA and IIB supergravities in a manifestly covariant manner with respect to O ( 10 , 10 ) T-duality and a pair of local Lorentz groups, or Spin ( 1 , 9 ) × Spin ( 9 , 1 ) , besides the usual general covariance of supergravities or the generalized diffeomorphism. While the theory is unique, the solutions are twofold. Type IIA and IIB supergravities are identified as two different types of solutions rather than two different theories.
121511469
The ϱ-peak in the dimuon spectrum as a clock for fireball lifetimes in relativistic nuclear collisions
Abstract We discuss the modification of the dipleton yield from vector mesons inside a nuclear fireball. We argue that the relative magnitude of the ϱ peak in the dilepton spectrum determines the lifetime of the hadron gas phase in nuclear collisions with an accuracy of about 1 fm/ c . We also find that the φ (ω + ϱ) ratio measured in the dimuon channel in 200 A GeV O + U and S + U collisions points towards a rather short-lived hadronic phase in these collisions.