Related papers: $\phi(2170)$ decaying to $\phi \pi\pi$ and $\phi K…

Splitting Strong and Electromagnetic Interactions in K(L4) Decays

We recently considered $K_{\ell 4}$ decays in the framework of chiral perturbation theory based on the effective Lagrangian including mesons, photons, and leptons. There, we published analytic one-loop-level expressions for form factors $f$…

High Energy Physics - Phenomenology · Physics 2009-11-10 A. Nehme

Observation of a resonant structure in $e^{+}e^{-} \to K^{+}K^{-}\pi^{0}\pi^{0}$

Using $e^{+}e^{-}$ collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total integrated luminosity of 300 pb^{-1}, a partial-wave analysis…

High Energy Physics - Experiment · Physics 2020-03-25 M. Ablikim , M. N. Achasov , P. Adlarson , S. Ahmed , M. Albrecht , A. Amoroso , Q. An , Anita , Y. Bai , O. Bakina , R. Baldini Ferroli , I. Balossino , Y. Ban , K. Begzsuren , J. V. Bennett , N. Berger , M. Bertani , D. Bettoni , F. Bianchi , J. Biernat , J. Bloms , I. Boyko , R. A. Briere , H. Cai , X. Cai , A. Calcaterra , G. F. Cao , N. Cao , S. A. Cetin , J. F. Chang , W. L. Chang , G. Chelkov , D. Y. Chen , G. Chen , H. S. Chen , M. L. Chen , S. J. Chen , X. R. Chen , Y. B. Chen , W. Cheng , G. Cibinetto , F. Cossio , X. F. Cui , H. ~L. ~Dai , J. P. Dai , X. C. Dai , A. Dbeyssi , D. Dedovich , Z. Y. Deng , A. Denig , I. Denysenko , M. Destefanis , F. De Mori , Y. Ding , C. Dong , J. Dong , L. Y. Dong , M. Y. Dong , S. X. Du , J. Fang , S. S. Fang , Y. Fang , R. Farinelli , L. Fava , F. Feldbauer , G. Felici , C. Q. Feng , M. Fritsch , C. D. Fu , Y. Fu , X. L. Gao , Y. Gao , Y. Gao , Y. G. Gao , I. Garzia , E. M. Gersabeck , A. Gilman , K. Goetzen , L. Gong , W. X. Gong , W. Gradl , M. Greco , L. M. Gu , M. H. Gu , S. Gu , Y. T. Gu , C. Y Guan , A. Q. Guo , L. B. Guo , R. P. Guo , Y. P. Guo , Y. P. Guo , A. Guskov , S. Han , T. T. Han , T. Z. Han , X. Q. Hao , F. A. Harris , K. L. He , F. H. Heinsius , T. Held , Y. K. Heng , M. Himmelreich , T. Holtmann , Y. ~R. ~Hou , Z. ~L. ~Hou , H. ~M. ~Hu , J. ~F. ~Hu , T. ~Hu , Y. ~Hu , G. ~S. ~Huang , L. ~Q. ~Huang , X. ~T. ~Huang , N. ~Huesken , T. ~Hussain , W. ~Ikegami Andersson , W. ~Imoehl , M. ~Irshad , S. ~Jaeger , S. ~Janchiv , Q. ~Ji , Q. ~P. ~Ji , X. ~B. ~Ji , X. ~L. ~Ji , H. ~B. ~Jiang , X. ~S. ~Jiang , X. ~Y. ~Jiang , J. ~B. ~Jiao , Z. ~Jiao , D. ~P. ~Jin , S. ~Jin , Y. ~Jin , T. ~Johansson , N. ~Kalantar-Nayestanaki , X. ~S. ~Kang , R. ~Kappert , M. ~Kavatsyuk , B. ~C. ~Ke , I. ~K. ~Keshk , A. ~Khoukaz , P. ~Kiese , R. ~Kiuchi , R. ~Kliemt , L. ~Koch , O. ~B. ~Kolcu , B. ~Kopf , M. ~Kuemmel , M. ~Kuessner , A. ~Kupsc , M. ~ G. ~Kurth , W. ~Kühn , J. ~J. ~Lane , J. ~S. ~Lange , P. ~Larin , L. ~Lavezzi , H. ~Leithoff , M. ~Lellmann , T. ~Lenz , C. ~Li , C. ~H. ~Li , Cheng~Li , D. ~M. ~Li , F. ~Li , G. ~Li , H. ~B. ~Li , H. ~J. ~Li , J. ~C. ~Li , J. ~L. ~Li , Ke~Li , L. ~K. ~Li , Lei~Li , P. ~L. ~Li , P. ~R. ~Li , S. ~Y. ~Li , W. ~D. ~Li , W. ~G. ~Li , X. ~H. ~Li , X. ~L. ~Li 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Investigation of the $e^+e^- \to \omega \pi^0 \to \pi^0 \pi^0 \gamma$ reaction in the energy domain near the $\phi$-meson

The $e^+e^- \to \omega \pi^0 \to \pi^0 \pi^0 \gamma$ process was investigated in the SND experiment at the VEPP-2M collider. A narrow energy interval near the $\phi$-meson was scanned. The observed cross-section reveals, at the level of…

High Energy Physics - Experiment · Physics 2009-09-25 M. N. Achasov , V. M. Aulchenko , A. V. Berdyugin , A. V. Bozhenok , D. A. Bukin , S. V. Burdin , T. V. Dimova , V. P. Druzhinin , M. S. Dubrovin , I. A. Gaponenko , V. B. Golubev , V. N. Ivanchenko , I. A. Koop , A. A. Korol , S. V. Koshuba , E. V. Pakhtusova , A. A. Salnikov , V. V. Shary , S. I. Serednyakov , Yu. M. Shatunov , V. A. Sidorov , Z. K. Silagadze , A. A. Valishev

Study of the process e+e- -> omega pi0 in the phi-meson mass region with the KLOE detector

We have studied the e+e- -> omegapi0 cross section in the sqrt(s) interval 1000-1030 MeV using the pi+pi-pi0pi0 and pi0pi0gamma final states with a sample of ~600 pb^-1 collected with the KLOE detector at DAFNE. By fitting the observed…

High Energy Physics - Experiment · Physics 2008-11-26 The KLOE Collaboration , F. Ambrosino , A. Antonelli , M. Antonelli , F. Archilli , P. Beltrame , G. Bencivenni , S. Bertolucci , C. Bini , C. Bloise , S. Bocchetta , F. Bossi , P. Branchini , P. Campana , G. Capon , T. Capussela , F. Ceradini , P. Ciambrone , F. Crucianelli , E. De Lucia , A. De Santis , P. De Simone , G. De Zorzi , A. Denig , A. Di Domenico , C. Di Donato , B. Di Micco , M. Dreucci , G. Felici , M. L. Ferrer , S. Fiore , P. Franzini , C. Gatti , P. Gauzzi , S. Giovannella , E. Graziani , W. Kluge , G. Lanfranchi , J. Lee-Franzini , D. Leone , M. Martini , P. Massarotti , S. Meola , S. Miscetti , M. Moulson , S. Müller , F. Murtas , M. Napolitano , F. Nguyen , M. Palutan , E. Pasqualucci , A. Passeri , V. Patera , F. Perfetto , P. Santangelo , B. Sciascia , A. Sciubba , A. Sibidanov , T. Spadaro , M. Testa , L. Tortora , P. Valente , G. Venanzoni , R. Versaci , G. Xu

The interference in the reaction $e^+e^-\to\gamma\pi^+\pi^-$ and the search for the decay $\phi\to\gamma f_0\to\gamma\pi^+\pi^-$

We describe the interference between amplitudes $e^+e^- \to \rho \to \gamma\pi^+\pi^-$ and $e^+e^- \to \phi \to \gamma f_0 \to \gamma\pi^+\pi^-$, where $f_0$ meson is considered in the frameworks of the four-quark model and the model of the…

High Energy Physics - Phenomenology · Physics 2010-11-15 N. N. Achasov , V. V. Gubin , E. P. Solodov

Density effects on the pion dispersion relation at finite temperature

We study the behavior of the pion dispersion relation in a pion medium at finite density and temperature, introducing a chemical potential to describe the finite pion number density. Such description is particularly important during the…

High Energy Physics - Phenomenology · Physics 2009-11-07 Alejandro Ayala

High-statistics study of neutral-pion pair production in two-photon collisions

The differential cross section for the process $\gamma \gamma \to \pi^0 \pi^0$ has been measured in the kinematic range 0.6 GeV $< W < 4.1$ GeV, $|\cos \theta^*|<0.8$ in energy and pion scattering angle, respectively, in the $\gamma\gamma$…

High Energy Physics - Experiment · Physics 2008-10-03 Belle Collaboration , I. Adachi

Rigorous Effective Field Theory Study on Pion Form Factor

We study $e^+e^-\to\pi^+\pi^-$ cross section and phase shift of $I=l=1$ $\pi-\pi$ scattering below 1GeV in framework of chiral constituent quark model. The results including all order contribution of the chiral perturbation expansion and…

High Energy Physics - Phenomenology · Physics 2007-05-23 Xiao-Jun Wang , Mu-Lin Yan

Determination of $\sigma(e^+e^-\to \pi^+ \pi^-)$ from radiative processes at DA$\Phi$NE

We have measured the cross section $\sigma(e^+e^-\to\pi^+\pi^-\gamma)$ with the KLOE detector at DA$\Phi$NE, at an energy $W=M_\phi=1.02$ GeV. From the dependence of the cross section on $m(\pi^+\pi^-)=\sqrt{W^2-2WE_\gamma}$, where…

High Energy Physics - Experiment · Physics 2008-11-26 The KLOE Collaboration , A. Aloisio

Tetraquark-based analysis and predictions of the cross sections and distributions for the processes e^+ e^- --> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) near Upsilon(5S)

We calculate the cross sections and final state distributions for the processes e^+ e^- --> Upsilon(1S) (pi^+ pi^-, K^+ K^-, eta pi^0) near the Upsilon(5S) resonance based on the tetraquark hypothesis. This framework is used to analyse the…

High Energy Physics - Phenomenology · Physics 2015-03-17 Ahmed Ali , Christian Hambrock , Satoshi Mishima

Study of the process $e^+e^-\to \pi^+\pi^-\pi^0$ using initial state radiation with BABAR

The process $e^+e^-\to \pi^+\pi^-\pi^0\gamma$ is studied at a center-of-mass energy near the $\Upsilon(4S)$ resonance using a data sample of 469 fb$^{-1}$ collected with the BABAR detector at the PEP-II collider. We have performed a precise…

High Energy Physics - Experiment · Physics 2021-11-15 The BABAR Collaboration

Theoretical study of the $D^0 \to K^- \pi^+ \eta$ reaction

We develop a model to study the $D^0 \to K^- \pi^+ \eta$ weak decay, starting with the color favored external emission and Cabibbo favored mode at the quark level. A less favored internal emission decay mode is also studied as a source of…

High Energy Physics - Phenomenology · Physics 2021-04-14 Genaro Toledo , Natsumi Ikeno , Eulogio Oset

The effect of multi-channel pion-pion scattering in decays of the $\Upsilon$-family mesons

The effect of isoscalar S-wave multi-channel pion-pion scattering ($\pi\pi\to\pi\pi,K\bar{K},\eta\eta$) is considered in the analysis of data on decays of the $\Upsilon$-meson family -- $\Upsilon(2S)\to\Upsilon(1S)\pi\pi$,…

High Energy Physics - Phenomenology · Physics 2014-10-14 Yu. S. Surovtsev , P. Bydzovsky , T. Gutsche , R. Kaminski , V. E. Lyubovitskij , M. Nagy

The reaction $\pi N \to \pi \pi N$ above threshold in chiral perturbation theory

Single pion production off nucleons is studied in the framework of relativistic baryon chiral perturbation theory at tree level with the inclusion of the terms from the dimension two effective pion-nucleon Lagrangian. The five appearing…

High Energy Physics - Phenomenology · Physics 2009-10-30 V. Bernard , N. Kaiser , Ulf-G. Meißner

The scalars $a_0(980)$ and $f_0(980)$ in the process $D_s^+ \to K^{+} K^{-} \pi^{+}$

In this work, we have investigated the process $D_s^+\to K^+ K^- \pi^+$, taking into account the contributions from the $S$-wave pseudoscalar-pseudoscalar interaction within the chiral unitary approach, and also the intermediate $\phi$…

High Energy Physics - Phenomenology · Physics 2021-09-13 Jun-Ya Wang , Man-Yu Duan , Guan-Ying Wang , De-Min Li , Li-Juan Liu , En Wang

Equation of state of imbalanced cold matter from chiral perturbation theory

We study the thermodynamic properties of matter at vanishing temperature for non-extreme values of the isospin chemical potential and of the strange quark chemical potential. From the leading order pressure obtained by maximizing the static…

High Energy Physics - Phenomenology · Physics 2016-04-06 Stefano Carignano , Andrea Mammarella , Massimo Mannarelli

K_L to \pi^+ \pi^- e^+ e^-

We calculate all of the form factors for the one-photon, $K_L \rightarrow \pi^+ \pi^- \gamma^* \rightarrow \pi^+ \pi^- e^+e^-$ contribution to the $K_L \rightarrow \pi^+ \pi^- e^+e^-$ decay amplitude at leading order in chiral perturbation…

High Energy Physics - Phenomenology · Physics 2014-11-17 John K. Elwood , Mark B. Wise , Martin J. Savage

Cross sections for inelastic $K$+$\phi$ scattering

In the first Born approximation we study the reactions $K\phi\to\pi K$, $\rho K$, $\pi K^*$, and $\rho K^*$ with quark-antiquark annihilation and creation. Transition amplitudes are derived with the development in spherical harmonics of the…

High Energy Physics - Phenomenology · Physics 2023-07-11 Yi-Hao Pan , Xiao-Ming Xu

Low-energy parameterisations of the pion-nucleon phase shifts

Compared in this work are a few sets of results, obtained from the pion-nucleon ($\pi N$) data at low energy (pion laboratory kinetic energy up to $100$ MeV) on the basis of the modelling of the $s$- and $p$-wave $K$-matrix elements (or of…

Nuclear Theory · Physics 2022-06-07 Evangelos Matsinos

Investigation of the $D^{0} \rightarrow K_S^{0} \pi^{0} \eta,\ K_S^{0} \pi^{0} \pi^0$ decays

Inspired by the invariant mass distributions for the decays $D^{0} \rightarrow K_S^{0} \pi^{0} \eta$ and $D^{0} \rightarrow K_S^{0} \pi^{0} \pi^{0}$ reported by the BESIII Collaboration, we investigate these processes with an unified final…

High Energy Physics - Phenomenology · Physics 2026-03-18 Wei Liang , Chu-Wen Xiao , Guo-Mei Gan , Shi-Qi Zhou