J. Gutierrez

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hep-ex2026

First Measurement of the Relative Phase between Proton Psionic Form Factors

BESIII Collaboration, M. Ablikim, M. N. Achasov +754

The relative phase between the time-like form factors of the proton is a crucial observable for a complete understanding of its internal structure, yet it has remained unmeasured d…

hep-ex2026

Observation of the $X (2370)$ in $J / ψ \to γ K_{S}^{0} K_{S}^{0} π^{0}$ and $J / ψ \to γ π^{0} π^{0} η$

BESIII Collaboration, M. Ablikim, M. N. Achasov +769

Based on $(10087 \pm 44) \times 1 0^{6}$ $J / ψ$ events collected with the BESIII detector, the $J / ψ \to γ K_{S}^{0} K_{S}^{0} π^{0}$ and $J / ψ \to γ π^{0} π^{0} η$ processes are stu…

hep-ex2026

Observation of the Exotic State $π_{1} (1600)$ in $ψ (2 S) \to γ χ_{c 1}, χ_{c 1} \to π^{+} π^{-} η^{'}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +750

A partial wave analysis of the process $ψ (2 S) \to γ χ_{c 1}, χ_{c 1} \to π^{+} π^{-} η^{'}$ is performed using $(2712.4 \pm 14.3) \times 1 0^{6}$ $ψ (2 S)$ events collected with t…

hep-ex2026

First Observation of \boldmath{ $D^{+} \to a_{0} (980) ρ$ and $D^{+} \to a_{0} (980)^{+} f_{0} (500)$ } in \boldmath{ $D^{+} \to π^{+} π^{+} π^{-} η$ and $D^{+} \to π^{+} π^{0} π^{0} η$ } Decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +756

We perform the first amplitude analysis of the singly Cabibbo-suppressed decays $D^{+} \to π^{+} π^{+ (0)} π^{- (0)} η$ , using $e^{+} e^{-}$ collision data collected with the BESIII detector…

hep-ex2026

Measurement of the branching fractions of $χ_{c J} \to π^{+} π^{-} π^{0} π^{0}$ via $ψ (3686) \to γ χ_{c J}$

BESIII Collaboration, M. Ablikim, M. N. Achasov +762

Using $(2712.4 \pm 14.3) \times 1 0^{6}$ $ψ (3686)$ events collected with the BESIII detector operating at BEPCII, the branching fractions of $χ_{c J} \to π^{+} π^{-} π^{0} π^{0}$ ( $J = 0, 1, 2$ ) are mea…

First Measurement of the Relative Phase between Proton Psionic Form Factors

Observation of the X(2370) in J/ψ→γKS0​KS0​π0 and J/ψ→γπ0π0η

Observation of the Exotic State π1​(1600) in ψ(2S)→γχc1​,χc1​→π+π−η′

First Observation of \boldmath{D+→a0​(980)ρ and D+→a0​(980)+f0​(500)} in \boldmath{D+→π+π+π−η and D+→π+π0π0η} Decays

Measurement of the branching fractions of χcJ​→π+π−π0π0 via ψ(3686)→γχcJ​

Observation of the $X (2370)$ in $J / ψ \to γ K_{S}^{0} K_{S}^{0} π^{0}$ and $J / ψ \to γ π^{0} π^{0} η$

Observation of the Exotic State $π_{1} (1600)$ in $ψ (2 S) \to γ χ_{c 1}, χ_{c 1} \to π^{+} π^{-} η^{'}$

First Observation of \boldmath{ $D^{+} \to a_{0} (980) ρ$ and $D^{+} \to a_{0} (980)^{+} f_{0} (500)$ } in \boldmath{ $D^{+} \to π^{+} π^{+} π^{-} η$ and $D^{+} \to π^{+} π^{0} π^{0} η$ } Decays

Measurement of the branching fractions of $χ_{c J} \to π^{+} π^{-} π^{0} π^{0}$ via $ψ (3686) \to γ χ_{c J}$