Measurement of Energy-Dependent Pair-Production Cross Section and Electromagnetic Form Factors of a Charmed Baryon

Sonia Kabana; Vindhyawasini Prasad; BESIII Collaboration

doi:10.1103/PHYSREVLETT.131.191901

Measurement of Energy-Dependent Pair-Production Cross Section and Electromagnetic Form Factors of a Charmed Baryon

Título traducido de la contribución: Medición de la sección transversal de producción de pares dependiente de la energía y de los factores de forma electromagnéticos de un barión encantado

Sonia Kabana
, Vindhyawasini Prasad
, BESIII Collaboration

Instituto de Alta Investigación

Universidad de Tarapacá

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

36 Citas (Scopus)

Resumen

Estudiamos el proceso e+e-→Λc+Λ¯c- a doce energías del centro de masas, desde 4,6119 hasta 4,9509 GeV, utilizando muestras de datos recopiladas por el detector BESIII del colisionador BEPCII. Las secciones eficaces de Born y los factores de forma efectivos (|Geff|) se determinan con una precisión sin precedentes tras combinar los métodos de etiqueta simple y doble basados en el proceso de desintegración Λc+→pK-π+. Se obtienen secciones eficaces planas alrededor de 4,63 GeV y no se encuentra ninguna indicación de la estructura resonante Y(4630), como la reportada por Belle. Además, no se observa ningún comportamiento oscilatorio en la dependencia energética de |Geff| de Λc+, a diferencia de lo observado en los casos de protones y neutrones. Al analizar la sección eficaz junto con la distribución del ángulo polar del barión Λc+ en cada punto de energía, se extraen y separan los módulos de los factores de forma eléctrico y magnético (|GE| y |GM|). Por primera vez, se observa la dependencia energética de la relación de factores de forma |GE/GM|, que puede describirse correctamente mediante una función oscilatoria.

Título traducido de la contribución	Medición de la sección transversal de producción de pares dependiente de la energía y de los factores de forma electromagnéticos de un barión encantado
Idioma original	Inglés
Número de artículo	191901
Páginas (desde-hasta)	1-11
Número de páginas	11
Publicación	Physical Review Letters
Volumen	131
N.º	19
DOI	https://doi.org/10.1103/PHYSREVLETT.131.191901
Estado	Publicada - 9 nov. 2023

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title = "Measurement of Energy-Dependent Pair-Production Cross Section and Electromagnetic Form Factors of a Charmed Baryon",

abstract = "We study the process e+e-→Λc+Λ¯c- at twelve center-of-mass energies from 4.6119 to 4.9509 GeV using data samples collected by the BESIII detector at the BEPCII collider. The Born cross sections and effective form factors (|Geff|) are determined with unprecedented precision after combining the single and double-tag methods based on the decay process Λc+→pK-π+. Flat cross sections around 4.63 GeV are obtained and no indication of the resonant structure Y(4630), as reported by Belle, is found. In addition, no oscillatory behavior is discerned in the |Geff| energy dependence of Λc+, in contrast to what is seen for the proton and neutron cases. Analyzing the cross section together with the polar-angle distribution of the Λc+ baryon at each energy point, the moduli of electric and magnetic form factors (|GE| and |GM|) are extracted and separated. For the first time, the energy dependence of the form factor ratio |GE/GM| is observed, which can be well described by an oscillatory function.",

author = "Sonia Kabana and Vindhyawasini Prasad and \{The BESIII collaboration\}",

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doi = "10.1103/PHYSREVLETT.131.191901",

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T1 - Measurement of Energy-Dependent Pair-Production Cross Section and Electromagnetic Form Factors of a Charmed Baryon

AU - Kabana, Sonia

AU - Prasad, Vindhyawasini

AU - The BESIII collaboration

PY - 2023/11/9

Y1 - 2023/11/9

N2 - We study the process e+e-→Λc+Λ¯c- at twelve center-of-mass energies from 4.6119 to 4.9509 GeV using data samples collected by the BESIII detector at the BEPCII collider. The Born cross sections and effective form factors (|Geff|) are determined with unprecedented precision after combining the single and double-tag methods based on the decay process Λc+→pK-π+. Flat cross sections around 4.63 GeV are obtained and no indication of the resonant structure Y(4630), as reported by Belle, is found. In addition, no oscillatory behavior is discerned in the |Geff| energy dependence of Λc+, in contrast to what is seen for the proton and neutron cases. Analyzing the cross section together with the polar-angle distribution of the Λc+ baryon at each energy point, the moduli of electric and magnetic form factors (|GE| and |GM|) are extracted and separated. For the first time, the energy dependence of the form factor ratio |GE/GM| is observed, which can be well described by an oscillatory function.

AB - We study the process e+e-→Λc+Λ¯c- at twelve center-of-mass energies from 4.6119 to 4.9509 GeV using data samples collected by the BESIII detector at the BEPCII collider. The Born cross sections and effective form factors (|Geff|) are determined with unprecedented precision after combining the single and double-tag methods based on the decay process Λc+→pK-π+. Flat cross sections around 4.63 GeV are obtained and no indication of the resonant structure Y(4630), as reported by Belle, is found. In addition, no oscillatory behavior is discerned in the |Geff| energy dependence of Λc+, in contrast to what is seen for the proton and neutron cases. Analyzing the cross section together with the polar-angle distribution of the Λc+ baryon at each energy point, the moduli of electric and magnetic form factors (|GE| and |GM|) are extracted and separated. For the first time, the energy dependence of the form factor ratio |GE/GM| is observed, which can be well described by an oscillatory function.

UR - https://www.scopus.com/pages/publications/85177799416

UR - https://publons.com/wos-op/publon/64265400/

UR - http://www.ncbi.nlm.nih.gov/pubmed/38000396

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SN - 0031-9007

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JO - Physical Review Letters

JF - Physical Review Letters

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M1 - 191901

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Measurement of Energy-Dependent Pair-Production Cross Section and Electromagnetic Form Factors of a Charmed Baryon

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