Results 51 to 60 of about 274,150 (265)

The investigation of K+π−, π+K− and π+π− atoms

EPJ Web of Conferences, 2016
Theory, using Low Energy QCD, predicts with high precision the pion-pion and pion-kaon scattering lengths. There is accurate relation between K+π− and π+K− atoms lifetime and pion-kaon S-wave scattering lengths with isospin 1/2 and 3/2.
Yazkov Valeriy
doaj   +1 more source

Evaluation of the Axial Vector Commutator Sum Rule for Pion-Pion Scattering

, 2007
We consider the sum rule proposed by one of us (SLA), obtained by taking the expectation value of an axial vector commutator in a state with one pion. The sum rule relates the pion decay constant to integrals of pion-pion cross sections, with one pion ...
F. J. Ynduráin, M. E. Saino, Stephen L. Adler, Y. Tomozawa   +3 more
core   +1 more source

QCD phase diagram in a magnetic background for different values of the pion mass [PDF]

Physical Review D, 2018
We investigate the behavior of the pseudocritical temperature of Nf=2+1 QCD as a function of a static magnetic background field for different values of the pion mass, going up to mπ≃660  MeV.
M. D’Elia, F. Manigrasso, F. Negro, F. Sanfilippo   +3 more
semanticscholar   +1 more source

Information on the structure of the rho meson from the pion form-factor

, 2009
The electromagnetic pion form-factor is calculated in a Bethe-Salpeter approach which accounts for pion rescattering. In the scattering kernel the pion-pion contact interaction from lowest-order chiral perturbation theory is considered together with an ...
F. Klingl, S. Leupold
core   +1 more source

Coupled channels calculation of a pion-Lambda-nucleon quasibound state

, 2010
We extend the study of a JP=2+, I=3/2 pion-Lambda-nucleon quasibound state [Phys. Rev. D 78, 014013 (2008)] by solving nonrelativistic Faddeev equations, using 3S1-3D1, Lambda N - Sigma N coupled channels Chiral Quark Model local interactions, and pion ...
Gal, Avraham, Garcilazo, Humberto
core   +1 more source

Determination of the pion-nucleon coupling constant and scattering lengths [PDF]

, 2000
We critically evaluate the isovector GMO sum rule for forward pion-nucleon scattering using the recent precision measurements of negatively charged pion-proton and pion-deuteron scattering lengths from pionic atoms.
A. A. Carter, A. A. Carter, A. Citron, A. Donnachie, A. S. Carroll, A. S. Carroll, A. W. Thomas, A. W. Thomas, B. Loiseau, B. Loiseau, B. Tromborg, B. W. Raichle, C. Caso, D. Bugg, D. Chatellard, D. Davidson, D. Sigg, D. Sigg, D. V. Bugg, E. Matsinos, E. Pedroni, G. Bizard, G. Bizard, G. Fäldt, G. Janssen, G. Janssen, H. Böckman, H. Ch. Schröder, H. Ch. Schröder, I. R. Afnan, J. Haidenbauer, J. R. Bergervoet, J. Rahm, K. F. Liu, K. Holinde, M. E. Sainio, M. L. Goldberger, M. L. Goldberger, M. Lacombe, M. M. Pavan, M. M. Pavan, M. M. Pavan, M. R. Robilotta, N. Fettes, N. Fettes, N. Kaiser, P. A. Guichon, P. Gauron, P. Hauser, R. A. Arndt, R. A. Arndt, R. A. Arndt, R. A. Arndt, R. A. M. Klomp, R. G. E. Timmermans, R. Koch, R. L. Workman, R. L. Workman, R. M. Rockmore, R. Machleidt, R. Machleidt, S. L. Baker, S. R. Beane, S. Weinberg, S. Weinberg, T. E. O. Ericson, T. E. O. Ericson, T. E. O. Ericson, T. E. O. Ericson, T. E. O. Ericson, T. E. O. Ericson, T. J. Devlin, T. Mizutani, U. G. Meissner, V. E. Lyubovitskij, V. G. Zinov, V. M. Kolybasov, V. Stoks, V. Stoks, V. V. Baru, W. R. Gibbs   +80 more
core   +4 more sources

Density resummation of perturbation series in a pion gas to leading order in chiral perturbation theory

, 2006
The mean field (MF) approximation for the pion matter, being equivalent to the leading ChPT order, involves no dynamical loops and, if self-consistent, produces finite renormalizations only.
A. Dobado, A. A. Abrikosov, A. B. Migdal, Amand Faessler, B. V. Martemyanov, C. Fuchs, C. Itzykson, C. M. Bender, E. Wigner, I. Yu. Kobzarev, I. Yu. Kobzarev, J. S. Dowker, J. S. Dowker, L. Landau, L. A. Kondratyuk, L. A. Kondratyuk, L. A. Kondratyuk, L. A. Kondratyuk, L. A. Kondratyuk, L. A. Kondratyuk, M. I. Krivoruchenko, M. S. Marinov, M. S. Marinov, M. S. Marinov, R. Hagedorn, R. Hagedorn, S. Kamefuchi, T.-S. Park   +27 more
core   +1 more source

Pion gas viscosity at low temperature and density [PDF]

, 2001
By using Chiral Perturbation Theory and the Uehling-Uhlenbeck equation we compute the viscosity of a pion gas, in the low temperature and low density regime, in terms of the temperature, and the pion fugacity.
A. Dobado, Antonio Dobado, E. A. Uehling, J. D. Bjorken, J. Gasser, L. D. Landau, M. Prakash, P. Gerber, S. Weinberg, Silvia N. Santalla   +9 more
core   +3 more sources

New class of compact stars: Pion stars [PDF]

Physical Review D, 2018
We investigate the viability of a new type of compact star whose main constituent is a Bose-Einstein condensate of charged pions. Several different setups are considered, where a gas of charged leptons and neutrinos is also present.
B. Brandt, G. Endrődi, E. Fraga, M. Hippert, J. Schaffner-Bielich, S. Schmalzbauer   +5 more
semanticscholar   +1 more source

Pion Form Factor in Chiral Limit of Hard-Wall AdS/QCD Model

, 2007
We develop a formalism to calculate form factor and charge density distribution of pion in the chiral limit using the holographic dual model of QCD with hard-wall cutoff. We introduce two conjugate pion wave functions and present analytic expressions for
A. V. Radyushkin, A. V. Radyushkin, E. Witten, H. R. Grigoryan, J. M. Maldacena, L. Da Rold, S. B. Gerasimov, S. B. Gerasimov   +7 more
core   +1 more source