We perform a full amplitude analysis of the process e+ e- → J/ψ$$D\bar{D}$$, where D refers to either D0 or D+. A new charmoniumlike state X*(3860) that decays to$$D\bar{D}$$ is observed with a significance of 6.5σ. Its mass is (3862 $$+26+40\atop{-32-13}$$) MeV=c2, and its width is (201 $$+154+88\atop{-67-82}$$) MeV. The JPC 0++ hypothesis is favored over the 2++ hypothesis at the level of 2.5σ.
Chilikin, K., et al. "Observation of an alternative <math display='inline'><msub><mi>χ</mi><mrow><mi>c</mi><mn>0</mn></mrow></msub><mo stretchy='false'>(</mo><mn>2</mn><mi>P</mi><mo stretchy='false'>)</mo></math> candidate in <math display='inline'><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>-</mo></msup><mo stretchy='false'>→</mo><mi>J</mi><mo stretchy='false'>/</mo><mi>ψ</mi><mi>D</mi><mover accent='true'><mi>D</mi><mo stretchy='false'>¯</mo></mover></math>." Physical Review D, vol. 95, no. 11, Jun. 2017. https://doi.org/10.1103/PhysRevD.95.112003
Chilikin, K., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aulchenko, V., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Barberio, E., Besson, D., Bhardwaj, V., Bhuyan, B., Biswal, J., Bobrov, A., Bondar, A., ... Zupanc, A. (2017). Observation of an alternative <math display='inline'><msub><mi>χ</mi><mrow><mi>c</mi><mn>0</mn></mrow></msub><mo stretchy='false'>(</mo><mn>2</mn><mi>P</mi><mo stretchy='false'>)</mo></math> candidate in <math display='inline'><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>-</mo></msup><mo stretchy='false'>→</mo><mi>J</mi><mo stretchy='false'>/</mo><mi>ψ</mi><mi>D</mi><mover accent='true'><mi>D</mi><mo stretchy='false'>¯</mo></mover></math>. Physical Review D, 95(11). https://doi.org/10.1103/PhysRevD.95.112003
Chilikin, K., Adachi, I., Aihara, H., et al., "Observation of an alternative <math display='inline'><msub><mi>χ</mi><mrow><mi>c</mi><mn>0</mn></mrow></msub><mo stretchy='false'>(</mo><mn>2</mn><mi>P</mi><mo stretchy='false'>)</mo></math> candidate in <math display='inline'><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>-</mo></msup><mo stretchy='false'>→</mo><mi>J</mi><mo stretchy='false'>/</mo><mi>ψ</mi><mi>D</mi><mover accent='true'><mi>D</mi><mo stretchy='false'>¯</mo></mover></math>," Physical Review D 95, no. 11 (2017), https://doi.org/10.1103/PhysRevD.95.112003
@article{osti_1373836,
author = {Chilikin, K. and Adachi, I. and Aihara, H. and Al Said, S. and Asner, D. M. and Aulchenko, V. and Ayad, R. and Babu, V. and Badhrees, I. and Bakich, A. M. and others},
title = {Observation of an alternative <math display='inline'><msub><mi>χ</mi><mrow><mi>c</mi><mn>0</mn></mrow></msub><mo stretchy='false'>(</mo><mn>2</mn><mi>P</mi><mo stretchy='false'>)</mo></math> candidate in <math display='inline'><msup><mi>e</mi><mo>+</mo></msup><msup><mi>e</mi><mo>-</mo></msup><mo stretchy='false'>→</mo><mi>J</mi><mo stretchy='false'>/</mo><mi>ψ</mi><mi>D</mi><mover accent='true'><mi>D</mi><mo stretchy='false'>¯</mo></mover></math>},
annote = {We perform a full amplitude analysis of the process e+ e- → J/ψ$D\bar{D}$, where D refers to either D0 or D+. A new charmoniumlike state X*(3860) that decays to$D\bar{D}$ is observed with a significance of 6.5σ. Its mass is (3862 $+26+40\atop{-32-13}$) MeV=c2, and its width is (201 $+154+88\atop{-67-82}$) MeV. The JPC 0++ hypothesis is favored over the 2++ hypothesis at the level of 2.5σ.},
doi = {10.1103/PhysRevD.95.112003},
url = {https://www.osti.gov/biblio/1373836},
journal = {Physical Review D},
issn = {ISSN 2470-0010},
number = {11},
volume = {95},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2017},
month = {06}}
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