Ruling Out the Massless Up-Quark Solution to the Strong CP Problem by Computing the Topological Mass Contribution with Lattice QCD

被引：15

作者：

Alexandrou, Constantia ^{[1
,2
]}

Finkenrath, Jacob ^{[2
]}

Funcke, Lena ^{[3
]}

Jansen, Karl ^{[4
]}

Kostrzewa, Bartosz ^{[5
,6
]}

Pittler, Ferenc ^{[5
,6
]}

Urbach, Carsten ^{[5
,6
]}

机构：

[1] Univ Cyprus, Dept Phys, POB 20537, CY-1678 Nicosia, Cyprus

[2] Cyprus Inst, Computat Based Sci & Technol Res Ctr, 20 Konstantinou Kavafi St, CY-2121 Nicosia, Cyprus

[3] Perimeter Inst Theoret Phys, 31 Caroline St North, Waterloo, ON N2L 2Y5, Canada

[4] DESY Zeuthen, NIC, Platanenallee 6, D-15738 Zeuthen, Germany

[5] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, Nussallee 14-16, D-53115 Bonn, Germany

[6] Univ Bonn, Bethe Ctr Theoret Phys, Nussallee 12, D-53115 Bonn, Germany

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 125卷 / 23期

关键词：

The infamous strong CP problem in particle physics can in principle be solved by a massless up quark. In particular; it was hypothesized that topological effects could substantially contribute to the observed nonzero up-quark mass without reintroducing CP violation. Alternatively to previous work using fits to chiral perturbation theory; in this Letter; we bound the strength of the topological mass contribution with direct lattice QCD simulations; by computing the dependence of the pion mass on the dynamical strange-quark mass. We find that the size of the topological mass contribution is inconsistent with the massless up-quark solution to the strong CP problem. © 2020 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title; journal citation; and DOI. Funded by SCOAP3;

D O I：

10.1103/PhysRevLett.125.232001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The infamous strong CP problem in particle physics can in principle be solved by a massless up quark. In particular, it was hypothesized that topological effects could substantially contribute to the observed nonzero up-quark mass without reintroducing CP violation. Alternatively to previous work using fits to chiral perturbation theory, in this Letter, we bound the strength of the topological mass contribution with direct lattice QCD simulations, by computing the dependence of the pion mass on the dynamical strange-quark mass. We find that the size of the topological mass contribution is inconsistent with the massless up-quark solution to the strong CP problem.

引用

页数：6

共 57 条

[1] First physics results at the physical pion mass from Nf=2 Wilson twisted mass fermions at maximal twist [J].

Abdel-Rehim, A. ;

Alexandrou, C. ;

Burger, F. ;

Constantinou, M. ;

Dimopoulos, P. ;

Frezzotti, R. ;

Hadjiyiannakou, K. ;

Helmes, C. ;

Jansen, K. ;

Jost, C. ;

Kallidonis, C. ;

Knippschild, B. ;

Kostrzewa, B. ;

Koutsou, G. ;

Liu, L. ;

Mangin-Brinet, M. ;

Ottnad, K. ;

Petschlies, M. ;

Pientka, G. ;

Rossi, G. C. ;

Urbach, C. ;

Wenger, U. ;

Werner, M. .

PHYSICAL REVIEW D, 2017, 95 (09)

[2] Measurement of the Permanent Electric Dipole Moment of the Neutron [J].

Abel, C. ;

Afach, S. ;

Ayres, N. J. ;

Baker, C. A. ;

Ban, G. ;

Bison, G. ;

Bodek, K. ;

Bondar, V. ;

Burghoff, M. ;

Chanel, E. ;

Chowdhuri, Z. ;

Chiu, P. -J. ;

Clement, B. ;

Crawford, C. B. ;

Daum, M. ;

Emmenegger, S. ;

Ferraris-Bouchez, L. ;

Fertl, M. ;

Flaux, P. ;

Franke, B. ;

Fratangelo, A. ;

Geltenbort, P. ;

Green, K. ;

Griffith, W. C. ;

van der Grinten, M. ;

Grujic, Z. D. ;

Harris, P. G. ;

Hayen, L. ;

Heil, W. ;

Henneck, R. ;

Helaine, V. ;

Hild, N. ;

Hodge, Z. ;

Horras, M. ;

Iaydjiev, P. ;

Ivanov, S. N. ;

Kasprzak, M. ;

Kermaidic, Y. ;

Kirch, K. ;

Knecht, A. ;

Knowles, P. ;

Koch, H. -C. ;

Koss, P. A. ;

Komposch, S. ;

Kozela, A. ;

Kraft, A. ;

Krempel, J. ;

Kuzniak, M. ;

Lauss, B. ;

Lefort, T. .

PHYSICAL REVIEW LETTERS, 2020, 124 (08)

[3] Baryon spectrum with Nf=2+1+1 twisted mass fermions [J].

Alexandrou, C. ;

Drach, V. ;

Jansen, K. ;

Kallidonis, C. ;

Koutsou, G. .

PHYSICAL REVIEW D, 2014, 90 (07)

[4] Comparison of topological charge definitions in Lattice QCD [J].

Alexandrou, Constantia ;

Athenodorou, Andreas ;

Cichy, Krzysztof ;

Dromard, Arthur ;

Garcia-Ramos, Elena ;

Jansen, Karl ;

Wenger, Urs ;

Zimmermann, Falk .

EUROPEAN PHYSICAL JOURNAL C, 2020, 80 (05)

[5] Multigrid approach in shifted linear systems for the non-degenerated twisted mass operator [J].

Alexandrou, Constantia ;

Bacchio, Simone ;

Finkenrath, Jacob .

COMPUTER PHYSICS COMMUNICATIONS, 2019, 236 :51-64

[6] Simulating twisted mass fermions at physical light, strange, and charm quark masses [J].

Alexandrou, Constantia ;

Bacchio, Simone ;

Charalambous, Panagiotis ;

Dimopoulos, Petros ;

Finkenrath, Jacob ;

Frezzotti, Roberto ;

Hadjiyiannakou, Kyriakos ;

Jansen, Karl ;

Koutsou, Giannis ;

Kostrzewa, Bartosz ;

Mangin-Brinet, Mariane ;

Rossi, Giancarlo ;

Simula, Silvano ;

Urbach, Carsten .

PHYSICAL REVIEW D, 2018, 98 (05)

[7] Adaptive aggregation-based domain decomposition multigrid for twisted mass fermions [J].

Alexandrou, Constantia ;

Bacchio, Simone ;

Finkenrath, Jacob ;

Frommer, Andreas ;

Kahl, Karsten ;

Rottmann, Matthias .

PHYSICAL REVIEW D, 2016, 94 (11)

[8]

[Anonymous], 2018, J LARGE SCALE RES FA, DOI 10.17815/jlsrf-4-121-1

[9] FLAG Review 2019 [J].

Aoki, S. ;

Aoki, Y. ;

Becirevic, D. ;

Blum, T. ;

Colangelo, G. ;

Collins, S. ;

Della Morte, M. ;

Dimopoulos, P. ;

Duerr, S. ;

Fukaya, H. ;

Golterman, M. ;

Gottlieb, Steven ;

Gupta, R. ;

Hashimoto, S. ;

Heller, U. M. ;

Herdoiza, G. ;

Horsley, R. ;

Juttner, A. ;

Kaneko, T. ;

Lin, C. -J. D. ;

Lunghi, E. ;

Mawhinney, R. ;

Nicholson, A. ;

Onogi, T. ;

Pena, C. ;

Portelli, A. ;

Ramos, A. ;

Sharpe, S. R. ;

Simone, J. N. ;

Simula, S. ;

Sommer, R. ;

Van de Water, R. ;

Vladikas, A. ;

Wenger, U. ;

Wittig, H. .

EUROPEAN PHYSICAL JOURNAL C, 2020, 80 (02)

[10] Review of lattice results concerning low-energy particle physics [J].

Aoki, S. ;

Aoki, Y. ;

Bernard, C. ;

Blum, T. ;

Colangelo, G. ;

Della Morte, M. ;

Duerr, S. ;

El-Khadra, A. X. ;

Fukaya, H. ;

Horsley, R. ;

Juettner, A. ;

Kaneko, T. ;

Laiho, J. ;

Lellouch, L. ;

Leutwyler, H. ;

Lubicz, V. ;

Lunghi, E. ;

Necco, S. ;

Onogi, T. ;

Pena, C. ;

Sachrajda, T. ;

Sharpe, S. R. ;

Simula, S. ;

Sommer, R. ;

Van de Water, R. S. ;

Vladikas, A. ;

Wenger, U. ;

Wittig, H. .

EUROPEAN PHYSICAL JOURNAL C, 2014, 74 (09)

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