Axial resonances a1(1260), b1(1235) and their decays from the lattice

被引：32

作者：

Lang, C. B. ^{[1
]}

Leskovec, Luka ^{[2
]}

Mohler, Daniel ^{[3
]}

Prelovsek, Sasa ^{[2
,4
]}

机构：

[1] Graz Univ, Inst Phys, A-8010 Graz, Austria

[2] Jozef Stefan Inst, Ljubljana 1000, Slovenia

[3] Fermilab Natl Accelerator Lab, Batavia, IL 60510 USA

[4] Univ Ljubljana, Dept Phys, Ljubljana 1000, Slovenia

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2014年 / 04期

基金：

美国能源部;

关键词：

Lattice QCD; QCD; QUANTUM-FIELD THEORIES; VOLUME DEPENDENCE; ENERGY-SPECTRUM; PARTICLES; VECTOR;

D O I：

10.1007/JHEP04(2014)162

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

The light axial-vector resonances a(1) (1260) and b(1) (1235) are explored in N-f = 2 lattice QCD by simulating the corresponding scattering channels p pi and w pi. Interpolating fields (q) over barq and p pi or w pi are used to extract the s-wave phase shifts for the first time. The. and. are treated as stable and we argue that this is justified in the considered energy range and for our parameters m pi similar or equal to 266MeV and L similar or equal to 2 fm. We neglect other channels that would be open when using physical masses in continuum. Assuming a resonance interpretation a Breit-Wigner fit to the phase shift gives the a(1) (1260) resonance mass m(a1)(res) = 1.435(53)( +/-(0)(109)) GeV compared to m(a1)(exp) = 1.230(40) GeV. The a(1) width Gamma(a1)(s) = g(2) p/s is parametrized in terms of the coupling and we obtain g(a1p pi) = 1.71( 39) GeV compared to g(a1p pi) (exp) = 1.35(30) GeV derived from Gamma(exp)(a1) = 425(175) MeV. In the b(1) channel, we find energy levels related to pi(0)w(0) and b(1) (1235), and the lowest level is found at E-1 greater than or similar to m(w) + m(pi) but is within uncertainty also compatible with an attractive interaction. Assuming the coupling g(b1w pi) extracted from the experimental width we estimate m(b1)(res) = 1.414(36) (+/-(0)(83)).

引用

页数：16

共 43 条

[1] Observation of a JPC=1-+ Exotic Resonance in Diffractive Dissociation of 190 GeV/c π- into π-π-π+ [J].

Alekseev, M. G. ;

Alexakhin, V. Yu ;

Alexandrov, Yu ;

Alexeev, G. D. ;

Amoroso, A. ;

Austregesilo, A. ;

Badelek, B. ;

Balestra, F. ;

Ball, J. ;

Barth, J. ;

Baum, G. ;

Bedfer, Y. ;

Bernhard, J. ;

Bertini, R. ;

Bettinelli, M. ;

Birsa, R. ;

Bisplinghoff, J. ;

Bordalo, P. ;

Bradamante, F. ;

Bravar, A. ;

Bressan, A. ;

Brona, G. ;

Burtin, E. ;

Bussa, M. P. ;

Chapiro, A. ;

Chiosso, M. ;

Chung, S. U. ;

Cicuttin, A. ;

Colantoni, M. ;

Crespo, M. L. ;

Dalla Torre, S. ;

Dafni, T. ;

Das, S. ;

Dasgupta, S. S. ;

Denisov, O. Yu ;

Dhara, L. ;

Diaz, V. ;

Dinkelbach, A. M. ;

Donskov, S. V. ;

Doshita, N. ;

Duic, V. ;

Duennweber, W. ;

Efremov, A. ;

El Alaoui, A. ;

Eversheim, P. D. ;

Eyrich, W. ;

Faessler, M. ;

Ferrero, A. ;

Finger, M. ;

Finger, M. .

PHYSICAL REVIEW LETTERS, 2010, 104 (24)

[2] Lattice QCD calculation of the ρ meson decay width [J].

Aoki, S. ;

Fukugita, M. ;

Ishikawa, K-I. ;

Ishizuka, N. ;

Kanaya, K. ;

Kuramashi, Y. ;

Namekawa, Y. ;

Okawa, M. ;

Sasaki, K. ;

Ukawa, A. ;

Yoshie, T. .

PHYSICAL REVIEW D, 2007, 76 (09)

[3] ρ meson decay in 2+1 flavor lattice QCD [J].

Aoki, S. ;

Ishikawa, K-I. ;

Ishizuka, N. ;

Kanaya, K. ;

Kuramashi, Y. ;

Namekawa, Y. ;

Okawa, M. ;

Taniguchi, Y. ;

Ukawa, A. ;

Ukita, N. ;

Yamazaki, T. ;

Yoshie, T. .

PHYSICAL REVIEW D, 2011, 84 (09)

[4] UNITARY COUPLED-CHANNEL ANALYSIS OF DIFFRACTIVE PRODUCTION OF A1 RESONANCE [J].

BASDEVANT, JL ;

BERGER, EL .

PHYSICAL REVIEW D, 1977, 16 (03) :657-678

[5] REVIEW OF PARTICLE PHYSICS Particle Data Group [J].

Beringer, J. ;

Arguin, J. -F. ;

Barnett, R. M. ;

Copic, K. ;

Dahl, O. ;

Groom, D. E. ;

Lin, C. -J. ;

Lys, J. ;

Murayama, H. ;

Wohl, C. G. ;

Yao, W. -M. ;

Zyla, P. A. ;

Amsler, C. ;

Antonelli, M. ;

Asner, D. M. ;

Baer, H. ;

Band, H. R. ;

Basaglia, T. ;

Bauer, C. W. ;

Beatty, J. J. ;

Belousov, V. I. ;

Bergren, E. ;

Bernardi, G. ;

Bertl, W. ;

Bethke, S. ;

Bichsel, H. ;

Biebel, O. ;

Blucher, E. ;

Blusk, S. ;

Brooijmans, G. ;

Buchmueller, O. ;

Cahn, R. N. ;

Carena, M. ;

Ceccucci, A. ;

Chakraborty, D. ;

Chen, M. -C. ;

Chivukula, R. S. ;

Cowan, G. ;

D'Ambrosio, G. ;

Damour, T. ;

de Florian, D. ;

de Gouvea, A. ;

DeGrand, T. ;

de Jong, P. ;

Dissertori, G. ;

Dobrescu, B. ;

Doser, M. ;

Drees, M. ;

Edwards, D. A. ;

Eidelman, S. .

PHYSICAL REVIEW D, 2012, 86 (01)

[6] On the generalized eigenvalue method for energies and matrix elements in lattice field theory [J].

Blossier, Benoit ;

Della Morte, Michele ;

von Hippel, Georg ;

Mendes, Tereza ;

Sommer, Rainer .

JOURNAL OF HIGH ENERGY PHYSICS, 2009, (04)

[7]

Briceno R. A., ARXIV13116032

[8] Moving multichannel systems in a finite volume with application to proton-proton fusion [J].

Briceno, Raul A. ;

Davoudi, Zohreh .

PHYSICAL REVIEW D, 2013, 88 (09)

[9]

collaboration COMPASS, ARXIV13123678

[10] Dynamical coupled-channel approaches on a momentum lattice [J].

Doering, M. ;

Haidenbauer, J. ;

Meissner, U. -G. ;

Rusetsky, A. .

EUROPEAN PHYSICAL JOURNAL A, 2011, 47 (12)

← 1 2 3 4 5 →