First Energy-Scan Measurement of 𝑒+⁢𝑒−→𝐾+⁢𝐾− around the 𝜓⁡(2⁢𝑆) Resonance

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First Energy-Scan Measurement of 𝑒+⁢𝑒−→𝐾+⁢𝐾− around the 𝜓⁡(2⁢𝑆) Resonance. / BESIII Collaboration ; Ачасов, Михаил Николаевич ; Мучной, Николай Юрьевич et al.

In: Physical Review Letters, Vol. 137, No. 11, 111904, 11.09.2026.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{a15efdce54794f3cafe0bdf96bd6684b,

title = "First Energy-Scan Measurement of 푒+⁢푒−→퐾+⁢퐾− around the 휓⁡(2⁢푆) Resonance",

abstract = "We report the precise energy scan measurement of the cross section line shape of 휓⁡(2⁢푆)→퐾+⁢퐾−. The analysis is based on 푒+⁢푒− collision data corresponding to an integrated luminosity of 495 pb−1 collected with the BESIII detector at BEPCII. By analyzing the cross section line shape, we extract the relative phase Φ between the strong and electromagnetic amplitudes of the 휓⁡(2⁢푆) resonance, a fundamental parameter in charmonium physics, based on the assumption that the relative phase between the electromagnetic amplitude of the 휓⁡(2⁢푆) resonance and the continuum is zero. Two distinct solutions for the branching fraction ℬ of 휓⁡(2⁢푆)→퐾+⁢퐾− are observed: a constructive interference solution with ℬ=(7.49±0.41)×10−5 and Φ=(110.1±6.7)°, and a destructive interference solution with ℬ=(10.94±0.48)×10−5 and Φ =(−106.8 ±5.7) °. A significant correlation between Φ and ℬ is established, demonstrating that interference effects must be taken into account in the 휓⁡(2⁢푆) branching fraction measurements. Additionally, the first results for both the 휓⁡(2⁢푆) strong form factor, which characterizes the strong coupling between 휓⁡(2⁢푆) and 퐾+⁢퐾−, and the energy-dependent electromagnetic form factor of the charged kaon in this energy region are reported.",

keywords = "Particle interactions, Particle production, Quantum chromodynamics, Strong interaction, Charm quark, Form factors, Bayesian methods, Calorimeters, Multi-purpose particle detectors, Scintillators",

author = "{BESIII Collaboration} and Ачасов, {Михаил Николаевич} and Мучной, {Николай Юрьевич} and Николаев, {Иван Борисович}",

note = "The BESIII Collaboration thanks the staff of BEPCII [41] and the IHEP computing center for their strong support. This work is supported in part by the National Key R&D Program of China under Contracts No. 2023YFA1606000 and No. 2023YFA1606704; Beijing Natural Science Foundation (BJNSF) under Contract No. JQ22002; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11935015, No. 11935016, No. 11935018, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12105100, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, and No. 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the Strategic Priority Research Program of Chinese Academy of Sciences under Contract No. XDA0480600; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174 and No. 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.",

year = "2026",

month = sep,

day = "11",

doi = "10.1103/q72k-vdtp",

language = "English",

volume = "137",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "11",

}

RIS

TY - JOUR

T1 - First Energy-Scan Measurement of 푒+⁢푒−→퐾+⁢퐾− around the 휓⁡(2⁢푆) Resonance

AU - BESIII Collaboration

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

AU - Николаев, Иван Борисович

N1 - The BESIII Collaboration thanks the staff of BEPCII [41] and the IHEP computing center for their strong support. This work is supported in part by the National Key R&D Program of China under Contracts No. 2023YFA1606000 and No. 2023YFA1606704; Beijing Natural Science Foundation (BJNSF) under Contract No. JQ22002; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11935015, No. 11935016, No. 11935018, No. 12025502, No. 12035009, No. 12035013, No. 12061131003, No. 12105100, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12221005, No. 12225509, No. 12235017, and No. 12361141819; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the Strategic Priority Research Program of Chinese Academy of Sciences under Contract No. XDA0480600; CAS under Contract No. YSBR-101; 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; German Research Foundation DFG under Contract No. FOR5327; Istituto Nazionale di Fisica Nucleare, Italy; Knut and Alice Wallenberg Foundation under Contracts No. 2021.0174 and No. 2021.0299; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Research Foundation of Korea under Contract No. NRF-2022R1A2C1092335; National Science and Technology fund of Mongolia; Polish National Science Centre under Contract No. 2024/53/B/ST2/00975; STFC (United Kingdom); Swedish Research Council under Contract No. 2019.04595; U.S. Department of Energy under Contract No. DE-FG02-05ER41374.

PY - 2026/9/11

Y1 - 2026/9/11

N2 - We report the precise energy scan measurement of the cross section line shape of 휓⁡(2⁢푆)→퐾+⁢퐾−. The analysis is based on 푒+⁢푒− collision data corresponding to an integrated luminosity of 495 pb−1 collected with the BESIII detector at BEPCII. By analyzing the cross section line shape, we extract the relative phase Φ between the strong and electromagnetic amplitudes of the 휓⁡(2⁢푆) resonance, a fundamental parameter in charmonium physics, based on the assumption that the relative phase between the electromagnetic amplitude of the 휓⁡(2⁢푆) resonance and the continuum is zero. Two distinct solutions for the branching fraction ℬ of 휓⁡(2⁢푆)→퐾+⁢퐾− are observed: a constructive interference solution with ℬ=(7.49±0.41)×10−5 and Φ=(110.1±6.7)°, and a destructive interference solution with ℬ=(10.94±0.48)×10−5 and Φ =(−106.8 ±5.7) °. A significant correlation between Φ and ℬ is established, demonstrating that interference effects must be taken into account in the 휓⁡(2⁢푆) branching fraction measurements. Additionally, the first results for both the 휓⁡(2⁢푆) strong form factor, which characterizes the strong coupling between 휓⁡(2⁢푆) and 퐾+⁢퐾−, and the energy-dependent electromagnetic form factor of the charged kaon in this energy region are reported.

AB - We report the precise energy scan measurement of the cross section line shape of 휓⁡(2⁢푆)→퐾+⁢퐾−. The analysis is based on 푒+⁢푒− collision data corresponding to an integrated luminosity of 495 pb−1 collected with the BESIII detector at BEPCII. By analyzing the cross section line shape, we extract the relative phase Φ between the strong and electromagnetic amplitudes of the 휓⁡(2⁢푆) resonance, a fundamental parameter in charmonium physics, based on the assumption that the relative phase between the electromagnetic amplitude of the 휓⁡(2⁢푆) resonance and the continuum is zero. Two distinct solutions for the branching fraction ℬ of 휓⁡(2⁢푆)→퐾+⁢퐾− are observed: a constructive interference solution with ℬ=(7.49±0.41)×10−5 and Φ=(110.1±6.7)°, and a destructive interference solution with ℬ=(10.94±0.48)×10−5 and Φ =(−106.8 ±5.7) °. A significant correlation between Φ and ℬ is established, demonstrating that interference effects must be taken into account in the 휓⁡(2⁢푆) branching fraction measurements. Additionally, the first results for both the 휓⁡(2⁢푆) strong form factor, which characterizes the strong coupling between 휓⁡(2⁢푆) and 퐾+⁢퐾−, and the energy-dependent electromagnetic form factor of the charged kaon in this energy region are reported.

KW - Particle interactions

KW - Particle production

KW - Quantum chromodynamics

KW - Strong interaction

KW - Charm quark

KW - Form factors

KW - Bayesian methods

KW - Calorimeters

KW - Multi-purpose particle detectors

KW - Scintillators

UR - https://www.scopus.com/pages/publications/105050292250

U2 - 10.1103/q72k-vdtp

DO - 10.1103/q72k-vdtp

M3 - Article

VL - 137

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 11

M1 - 111904

ER -

ID: 83242175