Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892)
We apply a recently developed dispersive formalism to calculate the Regge trajectories of the f2(1270), f2′(1525) and K⁎(892) mesons. Trajectories are calculated, not fitted to a family of resonances. Assuming that these resonances can be treated in the elastic approximation, the only input are the...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2015-10-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269315006206 |
| _version_ | 1818547304346419200 |
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| author | J.A. Carrasco J. Nebreda J.R. Pelaez A.P. Szczepaniak |
| author_facet | J.A. Carrasco J. Nebreda J.R. Pelaez A.P. Szczepaniak |
| author_sort | J.A. Carrasco |
| collection | DOAJ |
| description | We apply a recently developed dispersive formalism to calculate the Regge trajectories of the f2(1270), f2′(1525) and K⁎(892) mesons. Trajectories are calculated, not fitted to a family of resonances. Assuming that these resonances can be treated in the elastic approximation, the only input are the pole position and residue of a resonance. In all three cases, the predicted Regge trajectories are almost real and linear, with slopes in agreement with the universal value of order 1 GeV−2. We also show how these results barely change when considering more than two subtractions in the dispersive formalism. |
| first_indexed | 2024-12-12T08:04:58Z |
| format | Article |
| id | doaj.art-d0035da8319744b696f4f40c2c9f98cc |
| institution | Directory Open Access Journal |
| issn | 0370-2693 1873-2445 |
| language | English |
| last_indexed | 2024-12-12T08:04:58Z |
| publishDate | 2015-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-d0035da8319744b696f4f40c2c9f98cc2022-12-22T00:32:00ZengElsevierPhysics Letters B0370-26931873-24452015-10-01749C39940610.1016/j.physletb.2015.08.019Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892)J.A. Carrasco0J. Nebreda1J.R. Pelaez2A.P. Szczepaniak3Departamento de Física Teórica II, Universidad Complutense de Madrid, 28040 Madrid, SpainDepartamento de Física Teórica II, Universidad Complutense de Madrid, 28040 Madrid, SpainDepartamento de Física Teórica II, Universidad Complutense de Madrid, 28040 Madrid, SpainPhysics Department, Indiana University, Bloomington, IN 47405, USAWe apply a recently developed dispersive formalism to calculate the Regge trajectories of the f2(1270), f2′(1525) and K⁎(892) mesons. Trajectories are calculated, not fitted to a family of resonances. Assuming that these resonances can be treated in the elastic approximation, the only input are the pole position and residue of a resonance. In all three cases, the predicted Regge trajectories are almost real and linear, with slopes in agreement with the universal value of order 1 GeV−2. We also show how these results barely change when considering more than two subtractions in the dispersive formalism.http://www.sciencedirect.com/science/article/pii/S0370269315006206 |
| spellingShingle | J.A. Carrasco J. Nebreda J.R. Pelaez A.P. Szczepaniak Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892) Physics Letters B |
| title | Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892) |
| title_full | Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892) |
| title_fullStr | Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892) |
| title_full_unstemmed | Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892) |
| title_short | Dispersive calculation of complex Regge trajectories for the lightest f2 resonances and the K⁎(892) |
| title_sort | dispersive calculation of complex regge trajectories for the lightest f2 resonances and the k 892 |
| url | http://www.sciencedirect.com/science/article/pii/S0370269315006206 |
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