# International Workshop on e⁺e⁻ collisions from Phi to Psi 2017

26-29 June 2017
Schloss Waldthausen
Europe/Berlin timezone
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## Contribution List

Displaying 100 contributions out of 100
Presented by Andreas NYFFELER on 26 Jun 2017 at 09:25
Presented by Thomas TEUBNER on 26 Jun 2017 at 09:00
Presented by Matthias STEINHAUSER on 26 Jun 2017 at 15:10
Type: Poster Session: Poster Session
Board #: 30
The Beijing Electron Spectrometer III (BESIII) is a multi-purpose detector collecting data provided by the collisions in the Beijing Electron Positron Collider II (BEPCII), hosted at the Institute of High Energy Physics of Beijing. BESIII has already collected the world's largest sample of $J/\psi$ and $\psi(2s)$. Due to the unprecedented luminosity of the BEPCII, the most inner part of the Mul ... More
Presented by Marco MAGGIORA on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 12
We provide an updated analysis of the forward J/$\psi$-p scattering amplitude, relating its imaginary part to $\gamma p \to J/\psi p$ and $\gamma p \to c\bar{c}$ cross sections data, and calculating its real part through a once-subtracted dispersion relation. From a global fit to both differential and total cross section data, we extract a value for the spin-averaged J/$\psi$-p s-wave scatterin ... More
Presented by Mr. Oleksii GRYNIUK on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 16
Using the data sets taken at center-of-mass energies above 4 GeV by the BESIII detector at the BEPCII storage ring, we search for the reaction $e^+e^-\to\gamma_{\mathrm{ISR}} X(3872)\to\gamma_{\mathrm{ISR}}\pi^+\pi^-J/\psi$ via the Initial State Radiation technique. The production of a resonance with quantum numbers $J^{PC}=1^{++}$ such as the $X(3872)$ via single photon $e^+e^-$ annihilation is f ... More
Presented by Mr. Martin RIPKA on 27 Jun 2017 at 18:30
Presented by Konrad GRIESSINGER on 26 Jun 2017 at 11:55
Presented by Martin RIPKA on 26 Jun 2017 at 12:20
Presented by Xiaoshen KANG on 28 Jun 2017 at 12:20
Presented by Wenbiao YAN on 26 Jun 2017 at 17:20
Presented by Alaa DBEYSSI on 28 Jun 2017 at 15:05
Type: Poster Session: Poster Session
Board #: 4
At the Institute for Nuclear Physics in Mainz the new electron accelerator MESA will go into operation within the next years. In the extracted beam operation (155 MeV, 150 uA) the P2 experiment will measure the weak mixing angle in electron-proton scattering with a very high precision. For the desired accuracy 10,000 hours of operation time are needed and therefore the high-power beam dump of this ... More
Presented by Mr. Mirco CHRISTMANN, Dr. Patrick ACHENBACH on 27 Jun 2017 at 18:30
Presented by Ivan LOGASHENKO on 26 Jun 2017 at 10:35
Presented by Fedor IGNATOV on 26 Jun 2017 at 16:40
Presented by Stephan PAUL on 28 Jun 2017 at 11:55
Type: Poster Session: Poster Session
Board #: 20
The composite models, which address the existing problems of the Standard Model, generally include the excited leptons. I introduce new scenarios for possible generation of the baryon asymmetry of the universe using these new particles. The scenarios do not contradict to the small neutrino masses and the proton stability, and can be tested at the LHC.
Presented by Dr. Dmitry ZHURIDOV on 27 Jun 2017 at 18:30
Presented by Wolfgang GRADL on 28 Jun 2017 at 12:40
Type: Poster Session: Poster Session
Board #: 19
Using a data set of 2.93 fb$^{−1}$ taken at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider, a search for an extra U(1) gauge boson, also denoted as a dark photon, has been performed. We examine the initial state radiation reactions $e^{+}e^{-}\to e^{+}e^{−}\gamma_{ISR}$ and $e^{+}e^{-}\to\mu^{+}\mu^{−}\gamma_{ISR}$ for this search, where the dark photon ... More
Presented by Dr. Yuping GUO on 27 Jun 2017 at 18:30
Presented by Alessandra FILIPPI on 27 Jun 2017 at 12:30
Type: Poster Session: Poster Session
Board #: 24
It has been shown that the decay amplitude $\eta'\rightarrow \pi^+\pi^-\gamma$ has an important impact on the dispersion-theoretical analysis of the singly-virtual $\eta'$ transition form factor [1]. Consequently, we expect that the *doubly*-virtual transition form factor can be understood in more detail, starting from an analysis of the decay $\eta'\rightarrow2(\pi^+\pi^-)$. It was found that the ... More
Presented by Ms. Judith PLENTER on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 25
Due to multiple possible polarizations hard exclusive production of tensor mesons by virtual photons or in heavy meson decays offers interesting possibilities to study the helicity structure of the underlying short-distance process. Motivated by the first measurement of the transition form factor $\gamma^*\gamma \to f_2(1270)$ at large momentum transfers by the BELLE collaboration we present an im ... More
Presented by Nikoilay KIVEL on 27 Jun 2017 at 18:30
Presented by Andre HOANG
Type: Poster Session: Poster Session
Board #: 26
**MAGIX** is a planned experiment that will be implemented at the upcoming accelerator MESA in Mainz. Due to its location in the energy-recovering lane of the accelerator beam-currents up to **1 mA** with a maximum energy of **105 MeV** will be provided for precision experiments. MAGIX itself consists of a jet-target and two magnet-spectrometers. Inside the spectrometers **GEM**-based detectors wi ... More
Presented by Mr. Pepe GUELKER on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 27
MAGIX is a planned experiment that will be implemented at the upcoming accelerator MESA in Mainz. Due to its location in the energy-recovering lane of the accelerator beam currents up to 1 mA with a maximum energy of 105 MeV will be provided for precision experiments. MAGIX itself consists of a Jet Target and two magnet-spectrometers. The Jet-Target consists of a Laval-Nozzle and a catcher whic ... More
Presented by Stephan Marcus AULENBACHER on 27 Jun 2017 at 18:30
Presented by Bastian KUBIS on 29 Jun 2017 at 10:10
Type: Poster Session: Poster Session
Board #: 22
The neutral pion transition form factor plays prominent roles both in the hadronic light-by-light scattering corrections to the muon anomaly and in the electromagnetic rare decays of the pion. The singly-virtual transition form factor has been investigated in dispersion relations [1], where the form factor in time-like region was predicted based on the $e^+e^-\to 3 \pi$ cross section data and th ... More
Presented by Long BAI on 27 Jun 2017 at 18:30
Presented by Rong-Gang PING on 27 Jun 2017 at 09:25
Presented by B. Lee ROBERTS on 26 Jun 2017 at 09:45
Presented by Gilberto COLANGELO on 29 Jun 2017 at 15:15
Presented by Vladiszlav PAUK on 29 Jun 2017 at 14:55
Presented by Fred JEGERLEHNER on 26 Jun 2017 at 14:50
Presented by Zhiqing ZHANG on 26 Jun 2017 at 14:30
Type: Talk
Heavy-quark spin-symmetry (HQSS) partners of the isovector bottomonium-like states $Z_b(10610)$ and $Z_b(10650)$ are predicted within the molecular picture. Treating both $Z_b$ states as shallow bound states, we solve the system of coupled-channel integral equations for the contact plus one-pion exchange (OPE) potentials to predict the location of the partner states with the quantum numbers ... More
Presented by Vadim BARU on 29 Jun 2017 at 14:40
Presented by Guangshun HUANG on 29 Jun 2017 at 15:55
Type: Poster Session: Poster Session
Board #: 3
One of today’s most pressing question in nuclear physics is the understanding of the so-called "proton radius puzzle". The puzzle originates from a striking discrepancy between the electric charge radius of the proton, extracted from the muonic hydrogen Lamb shift, compared to measurements based on electron-proton scattering experiments and atomic transition measurements in electronic hydr ... More
Presented by Dr. Patrik ADLARSON, Dr. Vahe SOKHOYAN on 27 Jun 2017 at 18:30
Presented by Miha MIHOVILOVIC on 27 Jun 2017 at 10:05
Presented by Tsutomu MIBE on 26 Jun 2017 at 10:10
Presented by Korneliy TODYSHEV on 26 Jun 2017 at 17:00
Presented by Marcin BERLOWSKI on 29 Jun 2017 at 12:40
Presented by Lars SCHMITT on 29 Jun 2017 at 17:10
Presented by Eugene CHUDAKOV on 29 Jun 2017 at 17:35
Type: Poster Session: Poster Session
Board #: 21
We report on the lattice QCD calculation of the π0→γ∗γ∗ form factor with photon virtualities in the range Q2∈[0−1.5]~GeV2. Different lattice spacings and pion masses are used to extrapolate our result to the physical point. First, we check that our results, once extrapolated to the chiral and continuum limit, are compatible with the chiral anomaly. Then, the shape of the form factor i ... More
Presented by Dr. Antoine GERARDIN on 27 Jun 2017 at 18:30
Presented by Christoph LEHNER on 29 Jun 2017 at 09:25
Presented by Hartmut WITTIG on 29 Jun 2017 at 09:05
Type: Poster Session: Poster Session
Board #: 5
Running in parallel to the existing MAMI electron accelerator, the new workhorse of the Institute of Nuclear Physics of the University of Mainz is an energy recovering electron recirculator capable of delivering 1 mA polarized currents at 105 MeV to a fix target experiment in its path. The Magix experiment is currently being developed to exploit that power to perform high-precision experiments in ... More
Presented by Mr. Sabato Stefano CAIAZZA on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 14
We report a new precise measurement J/$\psi$ meson leptonic width performed with the KEDR detector at the VEPP-4M $e^+e^-$ collider. Cross sections for the processes $e^+e^-\to hadrons$ and $e^+e^- \to e^+e^-$ were measured at J/$\psi$ resonance energy range and $\Gamma_{ee}*B_{hadrons}$(J/$\psi$) value was obtained with accuracy about 2%. Leptonic and total widths were calculated, using the tabl ... More
Presented by Mrs. Tatyana KHARLAMOVA on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 15
Based on the nine data sets taken with the KEDR detector since 2004 in charmonia region, we report $\Gamma_{ee} \times \mathcal{B}_{\mu\mu} = 19.4 \pm 0.3 \pm 0.4$ eV for $\psi(2s)$ meson. The total luminosity accounted for is more than 6.5 pb$^{-1}$, corresponding to about $4 \times 10^6 \psi(2s)$. There were several scans of the resonance allowing us to know the collider energy spread and sev ... More
Presented by Mr. Andrey SUKHAREV on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 8
The cross section of the $e^+e^-\to K^+K^-$ process is measured with data samples collected with Beijing Spectrometer (BESIII) at $\sqrt{s} = 2.00 - 3.08$ GeV. The results are consistent with those of BaBar and with better precision. A structure near $2.2$ GeV is observed with mass $2229.8 \pm 5.3_{stat} \pm 17.2_{syst}$ MeV and width $143.7 \pm 12.0_{stat} \pm 7.8_{syst}$ MeV. The kaon form facto ... More
Presented by Mr. Dong LIU on 27 Jun 2017 at 18:30
Type: Poster Session: Poster Session
Board #: 11
We measure the cross sections of $e^+e^- \to e^+e^-$ and $e^+e^- \to \mu^+\mu^-$ processes using the data set collected with the BESIII detector at fifteen energy points around the $J/\psi$ resonance. By fitting the theoretical cross section curves of the two processes as functions of energy to the measured cross section data simultaneously, the combinations of $J/\psi$ decay widths $\Gamma_{ee}\G ... More Presented by Xingyu ZHOU on 27 Jun 2017 at 18:30 Presented by Graziano VENANZONI on 26 Jun 2017 at 12:40 Presented by Christoph Florian REDMER on 29 Jun 2017 at 12:20 Presented by Susan SCHADMAND on 29 Jun 2017 at 12:00 Presented by Christopher THOMAS on 28 Jun 2017 at 11:35 Presented by Alexandr MILSTEIN on 28 Jun 2017 at 15:25 Presented by Kurt AULENBACHER on 29 Jun 2017 at 16:45 Presented by Dmitry SHWARTZ on 29 Jun 2017 at 15:35 Presented by Boris SHWARTZ on 26 Jun 2017 at 17:40 Presented by Robert SZAFRON on 27 Jun 2017 at 15:05 Presented by Carl-Edwin CARLSON on 28 Jun 2017 at 14:15 Type: Poster Session: Poster Session Board #: 18 Usually the simulation of scattering processes in lattice QCD is carried out at unphysical high values of the quark masses [1]. Hence, a method to extrapolate data obtained in lattice calculations to physical masses is needed to allow for comparison between theory and experiment. To obtain a sound extrapolation, dispersion relations and chiral perturbation theory (ChPT) can be invoked. While a sim ... More Presented by Mr. Malwin NIEHUS on 27 Jun 2017 at 18:30 Presented by Andrej ARBUZOV on 27 Jun 2017 at 09:45 Type: Poster Session: Poster Session Board #: 6 After the upgrade of the positron injection facility the electron-positron collider VEPP-2000 started to operate at the end of last year and delivers an excellent luminosity, which is higher than the previous in 2-3 times. The detector CMD-3 has gained a new statistic, which corresponds to integrated luminosity of about 30 pb$^{-1}$. Many processes in the energy region from 1 to 2 GeV go through t ... More Presented by Prof. Gennady FEDOTOVICH on 27 Jun 2017 at 18:30 Presented by Patrik ADLARSON on 29 Jun 2017 at 11:20 Presented by Marek KARLINER on 28 Jun 2017 at 11:15 Presented by Roman MIZUK on 28 Jun 2017 at 09:10 Presented by Zhentian SUN on 28 Jun 2017 at 09:35 Presented by Matthew NEEDHAM on 28 Jun 2017 at 10:00 Presented by Maxim POSPELOV on 27 Jun 2017 at 12:05 Presented by Andre DE GOUVEA on 27 Jun 2017 at 14:40 Presented by Luciano MAIANI on 28 Jun 2017 at 08:45 Presented by Tatyana DIMOVA on 26 Jun 2017 at 11:30 Presented by Leonid KARDAPOLTSEV on 26 Jun 2017 at 18:00 Type: Poster Session: Poster Session Board #: 9 With the high luminosity accelerator -- BEPCII and the BESIII detector located in Beijing, China, for the first time, we are able to search for a non-vector charmoinum -- the$\chi_{c1}$state in$e^+e^-$direct production. In order to investigate the full interference line shape of$\chi_{c1}$with continuum background, we propose to take data with$e^+e^-$central-of-mass energy 2 MeV below, exa ... More Presented by Dr. Zhiqing LIU on 27 Jun 2017 at 18:30 Presented by Luca TRENTADUE on 26 Jun 2017 at 15:30 Presented by Alberto LUSIANI on 27 Jun 2017 at 11:45 Type: Poster Session: Poster Session Board #: 17 We analyze the contribution from intermediate spin–0 and spin–2 resonances to the$\tau\rightarrow 3\pi \nu_\tau$decay by means of a chiral invariant Lagrangian incorporating these mesons. In particular, we study the corresponding axial-vector form-factors. The advantage of this procedure with respect to previous analyses is that it incorporates chiral (and isospin) invariance and, hence, th ... More Presented by Dr. Olga SHEKHOVTSOVA on 27 Jun 2017 at 18:30 Type: Poster Session: Poster Session Board #: 7 The reaction$e^+e^- \to \pi^+\pi^-\pi^0\eta$has been studied in the experiment with the SND detector at the VEPP-2000$e^+e^-$collider. The reaction proceeds via the four intermediate states:$\omega\eta$,$\phi\eta$,$a_0\rho$and structureless$\pi^+\pi^-\pi^0\eta$state, which may be, for example,$\rho(1450)\pi$with$\rho(1450) \to \rho(770)\eta$. The total$e^+e^- \to \pi^+\pi^-\pi^0 ... More
Presented by Mr. Alexander BOTOV on 27 Jun 2017 at 18:30
Presented by Denis EPIFANOV on 27 Jun 2017 at 11:20
Presented by Emilie PASSEMAR on 27 Jun 2017 at 10:55
Type: Poster Session: Poster Session
Board #: 10
The integrated luminosity in the BELLE II experiment (20-50 ab$^{-1}$) will allow to access information never available before. It was found, within the model implemented in the newly updated Monte Carlo generator EKHARA, that at BELLE II it will be possible to study in detail $\chi_{ci} − \gamma^∗ − \gamma$ form factors through measurements of the reaction $e^+e^- \to e^+e^-\chi_{ci} (\t ... More Presented by Patrycja KISZA on 27 Jun 2017 at 18:30 Presented by Carlo CARLONI CALAME on 27 Jun 2017 at 09:05 Presented by Marco BATTAGLIERI on 27 Jun 2017 at 14:20 Presented by Changzheng YUAN on 29 Jun 2017 at 18:00 Presented by Igal JAEGLE on 27 Jun 2017 at 14:00 Type: Poster Session: Poster Session Board #: 28 The experiments at the future electron accelerator MESA (Mainz Energy-recovering Superconducting Accelerator) at the University of Mainz focus on the validity of the Standard Model of particle physics. Thereby, the main interest is the search for dark photons as candidates for dark matter, and precision measurements of fundamental constants, such as the proton radius or the electroweak mixing angl ... More Presented by Mrs. Silke GRIESER on 27 Jun 2017 at 18:30 Type: Poster Session: Poster Session Board #: 2 The proton is not an elementary particle but has a substructure governed by the interaction of quarks and gluons. The size of the proton is manifest in the spatial distributions of the electric charge and magnetization, which determine the response to electromagnetic interaction. Recently, contradictory measurements of the proton charge radius between muonic hydrogen and electronic probes have con ... More Presented by Prof. Michael KOHL on 27 Jun 2017 at 18:30 Presented by Aida X. EL-KHADRA on 29 Jun 2017 at 08:45 Type: Poster Session: Poster Session Board #: 1 Hard two-photon exchange has been favored theoretically to explain the previously observed discrepancy in measurements of the elastic proton electric-to-magnetic form factor ratio with polarized and unpolarized methods. Several experiments have been carried out to investigate the effects of two-photon exchange. The OLYMPUS experiment at DESY has been one of three dedicated experiments to use compa ... More Presented by Prof. Michael KOHL on 27 Jun 2017 at 18:30 Presented by Randolf POHL on 28 Jun 2017 at 14:40 Presented by Henryk CZYZ on 27 Jun 2017 at 08:45 Type: Poster Session: Poster Session Board #: 29 The BESIII experiment based at the BEPCII$e^{+}e^{-}$collider (Beijing, China) is investigating physics in the charm-$\tau$region. Processes in which the particles emission peaks towards small polar angles, such as Initial State Radiations (ISR) from$e^{+}e^{-}$annhiliations, are currently detected with limited efficiency. In order to improve their detections, we propose two small tagge ... More Presented by Dr. Brice GARILLON on 27 Jun 2017 at 18:30 Presented by Johann KUEHN on 26 Jun 2017 at 15:50 Type: Poster Session: Poster Session Board #: 13 In this work, we aim to provide a physical description of the recent BESIII data on the exotic meson decay,$ Y(4260) \to J/ \psi \; \pi^{+} \pi^{-}$. In the$\psi \pi$invariant mass distribution, one can observe two peaks, which correspond to the exotic meson$Z_c(3900)$and its kinematic reflection. Its shape can be parameterized as a S-wave Breit-Wigner and a background, which comes from the f ... More Presented by Mr. Daniel MOLNAR on 27 Jun 2017 at 18:30 Presented by Christoph HANHART on 28 Jun 2017 at 10:55 Presented by Igor DANILKIN on 29 Jun 2017 at 09:45 Presented by Elena PEREZ DEL RIO on 29 Jun 2017 at 11:40 Type: Poster Session: Poster Session Board #: 23 Phenomenological model, which describe very well the coupling of the$\pi^0, \eta, \eta^{'}$mesons to two photons is presented. The model of the form factors is consistent with the data in the space-like region, as well with the data in the time-like region with exception of the$\pi^0$BaBar data and$\eta\$ CMD2 data. The obtained form factors are implemented in Monte Carlo event generator Phokh ... More
Presented by Szymon TRACZ on 27 Jun 2017 at 18:30
Presented by Hideyuki NAKAZAWA on 29 Jun 2017 at 11:00
Presented by JGU President Prof. KRAUSCH on 26 Jun 2017 at 08:45
Type: Talk
Two-photon decays of a tensor D*D* molecule are studied and the suggested approach is applied to the X(3915) charmoniumlike state under the assumption of the latter being a 2++ molecule - a spin partner of the X(3872). It is argued that the existing experimental data disfavour such an identification of this state. Therefore, it is suggested that either the X(3915) has a different exotic nature or ... More
Presented by Alexey NEFEDIEV on 29 Jun 2017 at 14:25