Zobrazeno 1 - 10
of 895
pro vyhledávání: '"Ulf-G. Meissner"'
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 8, Pp 1-38 (2024)
Abstract The electromagnetic form factors G E and G M of the proton and neutron in the timelike region are extracted in a study of the processes e + e − → p ¯ p $$ \overline{p}p $$ and e + e − → n ¯ n $$ \overline{n}n $$ . The reaction ampl
Externí odkaz:
https://doaj.org/article/2aed6b2e68fd4f6b82488a99bd77bd40
Autor:
Zhen-Hua Zhang, Teng Ji, Xiang-Kun Dong, Feng-Kun Guo, Christoph Hanhart, Ulf-G. Meißner, Akaki Rusetsky
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 8, Pp 1-24 (2024)
Abstract Using chiral effective field theory, we predict that there must be isovector charmonium-like D D ¯ ∗ $$ D{\overline{D}}^{\ast } $$ hadronic molecules with J PC = 1++ denoted as W c1. The inputs are the properties of the X(3872), including
Externí odkaz:
https://doaj.org/article/c2a645799d704aa79099194bfd746491
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 7, Pp 1-10 (2024)
Abstract We extend our previous study of the interactions of $$\bar{D}^{(*)} \Lambda _c - \bar{D}^{(*)}\Sigma _c^{(*)}$$ D ¯ ( ∗ ) Λ c - D ¯ ( ∗ ) Σ c ( ∗ ) within an analytic, unitary, coupled-channel approach by including the $$J/\psi p$$
Externí odkaz:
https://doaj.org/article/0636f4b3961a4cd289feb5d50b7c23b1
Autor:
Helen Meyer, Ulf-G. Meißner
Publikováno v:
Journal of High Energy Physics, Vol 2024, Iss 6, Pp 1-20 (2024)
Abstract We present an improved calculation of the light element abundances in the framework of Big Bang nucleosynthesis as a function of the Higgs vacuum expectation value v. We compare the methods of our calculation to previous literature including
Externí odkaz:
https://doaj.org/article/8b7af825296d4b88ab0255785dc5b0c9
Publikováno v:
Physics Letters B, Vol 858, Iss , Pp 139023- (2024)
We investigate the feasibility of measuring the proton charge radius through dimuon photoproduction off a proton target. Our findings indicate that the Bethe-Heitler mechanism, which dominates at small momentum transfers, allows for an extraction of
Externí odkaz:
https://doaj.org/article/5cbefc72135d46cb8f4f8d35dedd50a0
Publikováno v:
Physics Letters B, Vol 856, Iss , Pp 138887- (2024)
We propose a novel method for measuring the charge radii of charged stable hadrons, with which the first measurement of the charge radii of the Σ+ and the Ξ− is foreseen. The method explores the facts that the Dalitz decay ψ(2S)→YY¯e+e− con
Externí odkaz:
https://doaj.org/article/14f7d7345eb94e2585d77492d9f6a01d
Publikováno v:
European Physical Journal C: Particles and Fields, Vol 84, Iss 4, Pp 1-12 (2024)
Abstract This study focuses on the interaction of the pseudoscalar meson octet and the baryon decuplet. In the continuum, it is observed that several $$J^{P}=\frac{3}{2}^-$$ J P = 3 2 - baryon resonances can be produced by the Weinberg-Tomozawa inter
Externí odkaz:
https://doaj.org/article/9dc5c3deb0e34066b87c61f0eec20348
Publikováno v:
Physics Letters B, Vol 853, Iss , Pp 138698- (2024)
A reliable determination of the pole parameters and residues of nucleon resonances is notoriously challenging, given the required analytic continuation into the complex plane. We provide a comprehensive analysis of such resonance parameters accessibl
Externí odkaz:
https://doaj.org/article/7d5b0af53299465f9d31ed6f380f44b5
Publikováno v:
Physics Letters B, Vol 853, Iss , Pp 138646- (2024)
The primary objective of this study is to investigate hadronic molecules of K⁎K¯1(1270) using a one-boson-exchange model, which incorporates exchanges of vector and pseudoscalar mesons in the t-channel, as well as the pion exchange in the u-channe
Externí odkaz:
https://doaj.org/article/8025486e46664ee89d0a010ac9fe9ee4
Publikováno v:
Physics Letters B, Vol 850, Iss , Pp 138463- (2024)
We present a systematic ab initio study of clustering in hot dilute nuclear matter using nuclear lattice effective field theory with an SU(4)-symmetric interaction. We introduce a method called light-cluster distillation to determine the abundances o
Externí odkaz:
https://doaj.org/article/d084bdef4ae343bfa425e592fd2b4d6b