scholarly journals On the Double Pole Structure of the Λ(1405)

2017 ◽  
Author(s):  
Luis Roca ◽  
Juan Nieves ◽  
Eulogio Oset
Keyword(s):  
Double Pole ◽  
Pole Structure

scholarly journals N*'s AND Δ's GENERATED IN VECTOR, PSEUDOSCALAR MESON-BARYON SYSTEMS

2014 ◽  
Vol 26 ◽  
pp. 1460060 ◽  
Author(s):  
K. P. KHEMCHANDANI ◽  
A. MARTÍNEZ TORRES ◽  
H. NAGAHIRO ◽  
A. HOSAKA
Keyword(s):  
Pseudoscalar Meson ◽  
Final States ◽  
Vector Mesons ◽  
Double Pole ◽  
Loop Function ◽  
Pseudoscalar Mesons ◽  
Pole Structure ◽  
Channel Interactions ◽  
Coupled Channel ◽  
Dynamical Origin

We have recently studied coupled channel interactions of vector and pseudoscalar mesons with octet baryons having total strangeness null and spin-parity 1/2-. We, thus, considered πN, ηN, KΛ, KΣ, ρN, ωN, ϕN, K*Λ, and K*Σ with total isospin 1/2 and 3/2. The interactions between pseudoscalar mesons and baryons are obtained by using the Weinberg-Tomozawa theorem. For the case of vector mesons, we calculate s-, t-, u-exchange diagrams and a contact term. The subtraction constants, required to calculate the loop-function in the scattering equations, are constrained by fitting the available experimental data on some of the reactions with pseudoscalar meson-baryon final states. We end up finding resonances which can be related to N*(1535), N*(1650) (with a double pole structure), N*(1895) and Δ(1620). We conclude that these resonances can be, at least partly, interpreted as dynamically generated resonances and that the vector mesons play an important role in determining the dynamical origin of the low-lying N* and Δ states.

scholarly journals Unveiling the K1(1270) double-pole structure in the B¯→J/ψρK¯ and B¯→J/ψK¯*π decays

2021 ◽  
Vol 103 (11) ◽  
Author(s):  
J. M. Dias ◽  
G. Toledo ◽  
L. Roca ◽  
E. Oset
Keyword(s):  
Double Pole ◽  
Pole Structure

scholarly journals SEARCHING FOR THE QUARK–DIQUARK SYSTEMATICS OF BARYONS COMPOSED BY LIGHT QUARKS q = u, d

2010 ◽  
Vol 25 (15) ◽  
pp. 2965-2995 ◽  
Author(s):  
A. V. ANISOVICH ◽  
V. V. ANISOVICH ◽  
M. A. MATVEEV ◽  
V. A. NIKONOV ◽  
A. V. SARANTSEV ◽  
...  
Keyword(s):  
Axial Vector ◽  
Mass Region ◽  
High Mass ◽  
Vector State ◽  
Double Pole ◽  
High Mass Region ◽  
Pole Structure ◽  
State Formula ◽  
Baryon Resonances

Supposing quark–diquark structure of baryons, we look for systematics of baryons composed of light quarks (q = u, d). We systematize baryons using the notion of two diquarks: (i) axial–vector state, [Formula: see text], with the spin SD = 1 and isospin ID = 1 and (ii) scalar one, [Formula: see text], with the spin SD = 0 and isospin ID = 0. We consider several schemes for the composed baryons: (1) with different diquark masses, [Formula: see text], (2) with [Formula: see text] and overlapping [Formula: see text] and [Formula: see text] states (resonances), (3) with/without SU(6) constraints for low-lying states (with quark–diquark orbital momenta L = 0). In the high-mass region, the model predicts several baryon resonances at M ~ 2.0–2.9 GeV . Moreover, the model gives us the double pole structure (i.e. two poles with the same Re M but different Im M) in many amplitudes at masses M ≳ 2.0 GeV . We see also that for description of low-lying baryons (with L = 0), the SU(6) constraint is needed.

scholarly journals Comparative Study of Dual PM Vernier Machines

2021 ◽  
Vol 12 (1) ◽  
pp. 12
Author(s):  
Huan Qu ◽  
Zi Qiang Zhu ◽  
Toru Matsuura ◽  
Dusan Ivanovic ◽  
Takashi Kato ◽  
...  
Keyword(s):  
Comparative Study ◽  
Open Circuit ◽  
Torque Density ◽  
Halbach Array ◽  
Higher Power ◽  
Pole Structure ◽  
Consequent Pole ◽  
Torque Ripples ◽  
Two Machines ◽  
Load Conditions

In this paper, two types of dual permanent magnet (PM) machines, i.e., stator slot dual-PM (SSDPM) machine and split-tooth dual-PM (STDPM) machine, are investigated and compared. Both machines have consequent pole structure with Halbach array PMs. Their difference lies in the position of stator PM. The SSDPM machine has Halbach array PMs in the stator slots, while the STDPM machine has PMs between the split teeth. Torque characteristics, i.e., average torques and torque ripples, of different slot/pole number combinations of the two machines are compared. The 24 stator slots/20 rotor slots/4 armature pole pair (24S20R4Pa) SSDPM machine with distributed windings and the 24 stator slots/10 rotor slots/4 armature pole pair (12S20R4Pa) STDPM machine with concentrated windings are compared under both open-circuit and on-load conditions. The results show that the SSDPM machine is more competitive by delivering higher torque density and higher power density.

scholarly journals Relating the b ghost and the vertex operators of the pure spinor superstring

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Osvaldo Chandia ◽  
Brenno Carlini Vallilo
Keyword(s):  
Vertex Operator ◽  
Bosonic String ◽  
Vertex Operators ◽  
Pure Spinor ◽  
Double Pole ◽  
Lorenz Gauge

Abstract The OPE between the composite b ghost and the unintegrated vertex operator for massless states of the pure spinor superstring is computed and shown to reproduce the structure of the bosonic string result. The double pole vanishes in the Lorenz gauge and the single pole is shown to be equal to the corresponding integrated vertex operator.

UHV AC and DC Coordinated Operation Techniques Based on Continuous Simulation

2015 ◽  
Vol 713-715 ◽  
pp. 1347-1350
Author(s):  
Yu Fei Rao ◽  
Lin Lin Yu
Keyword(s):  
Theoretical Analysis ◽  
High Voltage ◽  
Power Grid ◽  
Double Pole ◽  
Continuous Simulation ◽  
Operation Techniques ◽  
Load Mode ◽  
Typical Method ◽  
Ultra High Voltage

In the process of China's ultra high-voltage (UHV) construction, Henan UHV power grid is the important part. Summer great load mode of Henan power gird is chosen as the typical method. In the background of completing Nanyang UHV extension project, based on single pole running and double pole running of Hami-Zhengzhou UHVDC project respectively, it is simulated and analyzed. The results indicate that power grid cannot maintain stability when single pole block fault or double pole block fault occurs. Through theoretical analysis and simulation, under UHV AC running certain limit, HVDC latching grid is stable. Under UHV DC running certain limit, HVDC latching grid is stable. Based on continuous simulation, this paper obtained the coordinated operation of area UHV AC and DC.

LACTATE RESPONSE TO ROLLER SKIING WITH THE DOUBLE POLE AND DIAGONAL STRIDE TECHNIQUES

1992 ◽  
Vol 24 (Supplement) ◽  
pp. S105
Author(s):  
S. Mittelstadt ◽  
M. Hoffman ◽  
P. Clifford ◽  
K. O??Hagan ◽  
P. Walls ◽  
...  
Keyword(s):  
Double Pole
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