Search for <math display="inline"><msub><mi>η</mi><mi>c</mi></msub><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo><mo stretchy="false">→</mo><mi>p</mi><mover accent="true"><mi>p</mi><mo stretchy="false">¯</mo></mover></math> and branching fraction measurements of <math display="inline"><mrow><msub><mrow><mi>χ</mi></mrow><mrow><mi>c</mi><mi>J</mi></mrow></msub><mo stretchy="false">→</mo><mi>p</mi><mover accent="true"><mrow><mi>p</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover></mrow></math> via <math display="inline"><mi>ψ</mi><mo stretchy="false">(</mo><mn>2</mn><mi>S</mi><mo stretchy="false">)</mo></math> radiative decays - INSPIRE

DataBETA

Search for $η_{c} (2 S) \to p \bar{p}$ and branching fraction measurements of $χ_{c J} \to p \bar{p}$ via $ψ (2 S)$ radiative decays

BESIII

Collaboration

Oct 24, 2024

10 pages

Published in:

Phys.Rev.D 111 (2025) 1, 012003

Published: Jan 1, 2025

e-Print:

2410.18464 [hep-ex]

DOI:

10.1103/PhysRevD.111.012003 (publication)

Experiments:

BEPC-BES-III

View in:

ADS Abstract Service

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Abstract: (APS)

Using

(27.12 \pm 0.14) \times 10^{8}

ψ (2 S)

events collected by the BESIII detector operating at BEPCII, we search for the decay

η_{c} (2 S) \to p \bar{p}

via the process

ψ (2 S) \to γ η_{c} (2 S)

and only find a signal with a significance of

1.7 σ

. The upper limit of the product branching fraction at the 90% confidence level is determined to be

B (ψ (2 S) \to γ η_{c} (2 S)) \times B (η_{c} (2 S) \to p \bar{p}) < 2.4 \times 10^{- 7}

. The branching fractions of

χ_{c J} \to p \bar{p} (J = 0, 1, 2)

are also measured to be

B (χ_{c 0} \to p \bar{p}) = (2.51 \pm 0.02 \pm 0.08) \times 10^{- 4}

,

B (χ_{c 1} \to p \bar{p}) = (8.16 \pm 0.09 \pm 0.25) \times 10^{- 4}

, and

B (χ_{c 2} \to p \bar{p}) = (8.33 \pm 0.09 \pm 0.22) \times 10^{- 4}

, where the first uncertainty is statistical and the second systematic.

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