Chinese Physics C > 2018, Vol. 42 > Issue(4): 044101 DOI: 10.1088/1674-1137/42/4/044101

Triangle singularity enhancing isospin violation in B_s⁰→ J/ψπ⁰f₀(980)

Wei-Hong Liang^1,2,,,
S. Sakai^2,,,
Ju-Jun Xie^2,3,,,
E. Oset^2,,

1.
Department of Physics, Guangxi Normal University, Guilin 541004, China
2.
Departamento de Fí
3.
Departamento de Fí
4.
Departamento de Fí
5.
Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

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Abstract：
We perform calculations for the B _s ⁰→ J/ψπ ⁰f ₀(980) and B _s ⁰→ J/ψπ ⁰a ₀(980) reactions, showing that the first is isospin-suppressed while the second is isospin-allowed. The reaction proceeds via a triangle mechanism, with B _s ⁰→J/ψK ^* K+c.c., followed by the decay K ^*→Kπ and a further fusion of K Kinto the f ₀(980) or a ₀(980). We show that the mechanism develops a singularity around the π ⁰f ₀(980) or π ⁰a ₀(980) invariant mass of 1420 MeV, where the π ⁰f ₀and π ⁰a ₀decay modes are magnified and also the ratio of π ⁰f ₀to π ⁰a ₀production. Using experimental information for the B _s ⁰→ J/ψK ^* K+c.c. decay, we are able to obtain absolute values for the reactions studied which fall into the experimentally accessible range. The reactions proposed and the observables evaluated, when contrasted with actual experiments, should be very valuable to obtain information on the nature of the low lying scalar mesons.
- triangle singularity,
- light scalar meson,
- isospin violation,
- bottom meson decay

References

[1]	F. K. Guo, invited talk in the Hadron 2017 Conference, Salamanca, September 2017
[2]	L. D. Landau, Nucl. Phys., 13:181 (1959)
[3]	S. Coleman and R. E. Norton, Nuovo Cim., 38:438 (1965)
[4]	M. Bayar, F. Aceti, F. K. Guo, and E. Oset, Phys. Rev. D, 94:074039 (2016)
[5]	X. H. Liu, M. Oka, and Q. Zhao, Phys. Lett. B, 753:297 (2016)
[6]	C. Adolph et al (COMPASS Collaboration), Phys. Rev. Lett., 115:082001 (2015)
[7]	M. Mikhasenko, B. Ketzer, and A. Sarantsev, Phys. Rev. D, 91:094015 (2015)
[8]	F. Aceti, L. R. Dai, and E. Oset, Phys. Rev. D, 94:096015 (2016)
[9]	V. R. Debastiani, F. Aceti, W. H. Liang, and E. Oset, Phys. Rev. D, 95:034015 (2017)
[10]	C. Patrignani et al (Particle Data Group), Chin. Phys. C, 40:100001 (2016)
[11]	D. Barberis et al (WA102 Collaboration), Phys. Lett. B, 440:225 (1998)
[12]	J. J. Xie, L. S. Geng, and E. Oset, Phys. Rev. D, 95:034004 (2017)
[13]	R. Aaij et al (LHCb Collaboration), Phys. Rev. Lett., 115:072001 (2015)
[14]	R. Aaij et al (LHCb Collaboration), Chin. Phys. C, 40:011001 (2016)
[15]	F. K. Guo, Ulf-G. Meiner, W. Wang, and Z. Yang, Phys. Rev. D, 92:071502 (2015)
[16]	X. H. Liu, Q. Wang, and Q. Zhao, Phys. Lett. B, 757:231 (2016)
[17]	K. Moriya et al (CLAS Collaboration), Phys. Rev. C, 88:045201 (2013); Phys. Rev. C, 88:049902 (2013)
[18]	E. Wang, J. J. Xie, W. H. Liang, F. K. Guo, and E. Oset, Phys. Rev. C, 95:015205 (2017)
[19]	E. Gutz et al (CBELSA/TAPS Collaboration), Eur. Phys. J. A, 50:74 (2014)
[20]	V. R. Debastiani, S. Sakai, and E. Oset, Phys. Rev. C, 96:025201 (2017)
[21]	J. J. Xie and F. K. Guo, Phys. Lett. B, 774:108 (2017)
[22]	B. Pal et al (Belle Collaboration), Phys. Rev. D, 96:051102 (2017)
[23]	S. Sakai, E. Oset, and W. H. Liang, Phys. Rev. D, 96:074025 (2017)
[24]	N. N. Achasov, S. A. Devyanin, and G. N. Shestakov, Phys. Lett. B, 88:367 (1979)
[25]	C. Hanhart, Phys. Rept., 397:155 (2004)
[26]	J. J. Wu, Q. Zhao, and B. S. Zou, Phys. Rev. D, 75:114012 (2007)
[27]	C. Hanhart, B. Kubis, and J. R. Pelaez, Phys. Rev. D, 76:074028 (2007)
[28]	L. Roca, Phys. Rev. D, 88:014045 (2013)
[29]	J. J. Wu, X. H. Liu, Q. Zhao, and B. S. Zou, Phys. Rev. Lett., 108:081803 (2012)
[30]	F. Aceti, W. H. Liang, E. Oset, J. J. Wu, and B. S. Zou, Phys. Rev. D, 86:114007 (2012)
[31]	M. Ablikim et al (BESⅢ Collaboration), Phys. Rev. Lett., 108:182001 (2012)
[32]	F. Aceti, J. M. Dias, and E. Oset, Eur. Phys. J. A, 51:48 (2015)
[33]	M. Ablikim et al (BESⅢ Collaboration), Phys. Rev. D, 92:012007 (2015)
[34]	L. L. Chau and H. Y. Cheng, Phys. Rev. D, 36:137 (1987); Phys. Rev. D, 39:2788 (1989)
[35]	W. H. Liang and E. Oset, Phys. Lett. B, 737:70 (2014)
[36]	E. Oset et al, Int. J. Mod. Phys. E, 25:1630001 (2016)
[37]	R. Aaij et al (LHCb Collaboration), JHEP, 1407:140 (2014)
[38]	R. Pavao, S. Sakai, and E. Oset, Eur. Phys. J. C, 77:599 (2017)
[39]	S. Sakai, E. Oset, and A. Ramos, Eur. Phys. J. A, 54:10 (2018)
[40]	J. A. Oller and E. Oset, Nucl. Phys. A, 620:438 (1997); A 652:407 (E) (1999)
[41]	M. Bayar and V. R. Debastiani, Phys. Lett. B, 775:94 (2017)

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Wei-Hong Liang, S. Sakai, Ju-Jun Xie and E. Oset. Triangle singularity enhancing isospin violation in B _s ⁰→ J/ψπ ⁰f ₀(980)[J]. Chinese Physics C, 2018, 42(4): 044101. doi: 10.1088/1674-1137/42/4/044101

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Received: 2017-11-29

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Supported by National Natural Science Foundation of China (11565007, 11747307, 11647309, 11735003, 11475227), the Youth Innovation Promotion Association CAS (2016367). This work is also partly supported by the Spanish Ministerio de Economia y Competitividad and European FEDER funds (FIS2011-28853-C02-01, FIS2011-28853-C02-02, FIS2014-57026-REDT, FIS2014-51948-C2-1-P, FIS2014-51948-C2-2-P) and the Generalitat Valenciana in the program Prometeo (II-2014/068)

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通讯作者:陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Triangle singularity enhancing isospin violation in B_s⁰→ J/ψπ⁰f₀(980)

Corresponding author:Wei-Hong Liang,

Corresponding author:S. Sakai,

Corresponding author:Ju-Jun Xie,

Corresponding author:E. Oset,

1. Department of Physics, Guangxi Normal University, Guilin 541004, China

2. Departamento de Fí

3. Departamento de Fí

4. Departamento de Fí

5. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Received Date:2017-11-29

Available Online:2018-04-05

Fund Project:Supported by National Natural Science Foundation of China (11565007, 11747307, 11647309, 11735003, 11475227), the Youth Innovation Promotion Association CAS (2016367). This work is also partly supported by the Spanish Ministerio de Economia y Competitividad and European FEDER funds (FIS2011-28853-C02-01, FIS2011-28853-C02-02, FIS2014-57026-REDT, FIS2014-51948-C2-1-P, FIS2014-51948-C2-2-P) and the Generalitat Valenciana in the program Prometeo (II-2014/068)

Abstract:We perform calculations for theB_s⁰→ J/ψπ⁰f₀(980) andB_s⁰→ J/ψπ⁰a₀(980) reactions, showing that the first is isospin-suppressed while the second is isospin-allowed. The reaction proceeds via a triangle mechanism, withB_s⁰→J/ψK^*K+c.c., followed by the decay K^*→Kπ and a further fusion of KKinto the f₀(980) or a₀(980). We show that the mechanism develops a singularity around the π⁰f₀(980) or π⁰a₀(980) invariant mass of 1420 MeV, where the π⁰f₀and π⁰a₀decay modes are magnified and also the ratio of π⁰f₀to π⁰a₀production. Using experimental information for theB_s⁰→ J/ψK^*K+c.c. decay, we are able to obtain absolute values for the reactions studied which fall into the experimentally accessible range. The reactions proposed and the observables evaluated, when contrasted with actual experiments, should be very valuable to obtain information on the nature of the low lying scalar mesons.

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Triangle singularity enhancing isospin violation in B_s⁰→ J/ψπ⁰f₀(980)

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