Search for η<sub>c</sub> (2S) → p(p)over-bar and branching fraction measurements of χ<sub>cJ</sub> → p(p)over-bar via ψ(2S) radiative decays

Using (27.12 +/- 0.14) x 10(8) psi(2S) events collected by the BESIII detector operating at BEPCII, we search for the decay eta(c) (2S) -> p (p) over bar via the process psi(2S) -> gamma eta(c)(2S) and only find a signal with a significance of 1.7 sigma. The upper limit of the product branching fraction at the 90% confidence level is determined to be B(psi(2S) -> gamma eta(c)(2S)) B(eta(c) (2S) -> p (p) over bar)< 2.4 x 10(-7). The branching fractions of chi(cJ) -> p (J = 0, 1, 2) are also measured to be B(chi(c0) -> p (p) over bar) = (2.51 +/- 0.02 +/- 0.08) x 10(-4), B(chi(c1) -> p (p) over bar) = (8.16 +/- 0.09 +/- 0.25) x 10(-4), and B(chi(c2) -> p (p) over bar) = (8.33 +/- 0.09 +/- 0.22) x 10(-4), where the first uncertainty is statistical and the second systematic.

Chat with Graph Search

Ask any question about EPFL courses, lectures, exercises, research, news, etc. or try the example questions below.

DISCLAIMER: The Graph Chatbot is not programmed to provide explicit or categorical answers to your questions. Rather, it transforms your questions into API requests that are distributed across the various IT services officially administered by EPFL. Its purpose is solely to collect and recommend relevant references to content that you can explore to help you answer your questions.

Search for η<sub>c</sub> (2S) → p(p)over-bar and branching fraction measurements of χ<sub>cJ</sub> → p(p)over-bar via ψ(2S) radiative decays

Chat with Graph Search

Search for $B_{(s)}^{*0}\rightarrow \mu ^+\mu ^-$ in $B_c^+\rightarrow \pi ^+\mu ^+\mu ^-$ decays

Test of Lepton Universality and Measurement of the Form Factors of D0 →k∗ (892)-μ+νμ

Analytical and EZmock covariance validation for the DESI 2024 results