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Search for Darkonium in $e^+e^-$ Collisions
/ BABAR Collaboration
Collider searches for dark sectors, new particles interacting only feebly with ordinary matter, have largely focused on identifying signatures of new mediators, leaving much of dark sector structures unexplored. In particular, the existence of dark matter bound states (darkonia) remains to be investigated. [...]
arXiv:2106.08529; BABAR-PUB-21/002; SLAC-PUB-17608.-
2022-01-11 - 10 p.
- Published in : Phys. Rev. Lett. 128 (2022) 021802
Fulltext: PDF;
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GEM detector performance with innovative micro-TPC readout in high magnetic field
/ Garzia, I (INFN, Ferrara ; Ferrara U.) ; Alexeev, M (INFN, Turin) ; Amoroso, A (INFN, Turin ; Turin U.) ; Baldini Ferroli, R (Frascati ; Beijing, Inst. High Energy Phys.) ; Bertani, M (Frascati) ; Bettoni, D (INFN, Ferrara) ; Bianchi, F (INFN, Turin ; Turin U.) ; Calcaterra, A (Frascati) ; Canale, N (Ferrara U.) ; Capodiferro, M (Frascati ; INFN, Rome) et al.
Gas detector development is one of the pillars of the research in fundamental physics. Since several years, a new concept of detectors, called Micro Pattern Gas Detector (MPGD), allowed to overcome several problems related to other types of commonly used detectors, like drift chamber and micro strips detectors, reducing the rate of discharges and providing better radiation tolerance. [...]
2018 - 5 p.
- Published in : EPJ Web Conf. 170 (2018) 01009
Fulltext: PDF;
In : INTERNATIONAL CONFERENCE on ADVANCEMENTS in NUCLEAR INSTRUMENTATION MEASUREMENT METHODS and their APPLICATIONS, Liege, Belgique, 19 - 23 Jun 2017, pp.01009
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A Cylindrical GEM Inner Tracker for the BESIII experiment at IHEP
/ Farinelli, R. (INFN, Ferrara ; Ferrara U.) ; Alexeev, M. (INFN, Turin) ; Amoroso, A. (INFN, Turin) ; Bianchi, F. (INFN, Turin) ; Bertani, M. (INFN, Rome) ; Bettoni, D. (INFN, Ferrara) ; Canale, N. (INFN, Ferrara ; Ferrara U.) ; Calcaterra, A. (INFN, Rome) ; Carassiti, V. (INFN, Ferrara) ; Cerioni, S. (INFN, Rome) et al.
The Beijing Electron Spectrometer III (BESIII) is a multipurpose detector that collects data provided by the collision in the Beijing Electron Positron Collider II (BEPCII), hosted at the Institute of High Energy Physics of Beijing. [...]
arXiv:1807.00500.
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2018.
Fulltext
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Test beam results of a Cylindrical GEM detector for the BESIII experiment
/ Mezzadri, Giulio (INFN, Ferrara ; Ferrara U.) ; Alexeev, Maxim (INFN, Turin) ; Amoroso, Antonio (INFN, Turin ; Turin U.) ; Baldini Ferroli, Rinaldo (Beijing, Inst. High Energy Phys. ; Frascati) ; Bertani, Monica (Frascati) ; Bettoni, Diego (INFN, Ferrara) ; Bianchi, Fabrizio (INFN, Turin ; Turin U.) ; Calcaterra, Alessandro (Frascati) ; Canale, Nicola (INFN, Ferrara) ; Capodiferro, Manlio (Frascati ; INFN, Rome) et al.
Gas detector are very light instrument used in high energy physics to measure the particle properties: position and momentum. Through high electric field is possible to use the Gas Electron Multiplier (GEM) technology to detect the charged particles and to exploit their properties to construct a large area detector, such as the new IT for BESIII. [...]
arXiv:1803.07489.-
SISSA, 2019 - 8 p.
- Published in : PoS MPGD2017 (2019) 048
Fulltext: 1803.07489 - PDF; PoS(MPGD2017)048 - PDF;
In : 5th International Conference on Micro-Pattern Gas Detectors, Philadelphia, Pennsylvania, Pa, Usa, 22 - 26 May 2017, pp.048
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The new cylindrical GEM inner tracker of BESIII
/ Lavezzi, L. (Beijing, Inst. High Energy Phys. ; INFN, Turin) ; Alexeev, M. (INFN, Turin) ; Amoroso, A. (INFN, Turin ; Turin U.) ; Baldini Ferroli, R. (Beijing, Inst. High Energy Phys. ; Frascati) ; Bertani, M. (Frascati) ; Bettoni, D. (INFN, Ferrara) ; Bianchi, F. (INFN, Turin ; Turin U.) ; Calcaterra, A. (Frascati) ; Canale, N. (INFN, Ferrara) ; Capodiferro, M. (Frascati ; INFN, Rome) et al.
The Cylindrical GEM-Inner Tracker (CGEM-IT) is the upgrade of the internal tracking system of the BESIII experiment. It consists of three layers of cylindrically-shaped triple GEMs, with important innovations with respect to the existing GEM detectors, in order to achieve the best performance with the lowest material budget. [...]
arXiv:1803.07258.-
2018-05-03 - 6 p.
- Published in : Int. J. Mod. Phys. Conf. Ser. 46 (2018) 1860077
Fulltext: PDF; Fulltext from Publisher: PDF; External link: Fulltext
In : The 21st Particles & Nuclei International Conference, Beijing, China, 1 - 5 Sep 2017, pp.1860077
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Development and Test of a $\mu$TPC Cluster Reconstruction for a Triple GEM Detector in Strong Magnetic Field
/ Farinelli, R. (INFN, Ferrara ; Ferrara U.) ; Alexeev, M. (INFN, Turin) ; Amoroso, A. (INFN, Turin) ; Bianchi, F. (INFN, Turin) ; Bertani, M. (Beijing, Inst. High Energy Phys.) ; Bettoni, D. (INFN, Ferrara) ; Canale, N. (INFN, Ferrara ; Ferrara U.) ; Calcaterra, A. (Beijing, Inst. High Energy Phys.) ; Carassiti, V. (INFN, Ferrara) ; Cerioni, S. (Beijing, Inst. High Energy Phys.) et al.
Performance of triple GEM prototypes has been evaluated by means of a muon beam at the H4 line of the SPS test area at CERN. The data from two planar prototypes have been reconstructed and analyzed offline with two clusterization methods: the enter of gravity of the charge distribution and the micro Time Projection Chamber (\muTPC). [...]
arXiv:1707.04456.-
Oct. 2016 - 4 p.
- Published in : 10.1109/NSSMIC.2016.8069914
Preprint: PDF;
In : IEEE Nuclear Science Symposium and Medical Imaging Conference, Strasbourg, France, 29 Oct - 6 Nov 2016, pp.8069914
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The Cylindrical GEM Inner Tracker of the BESIII experiment: prototype test beam results
/ Lavezzi, L. (Beijing, Inst. High Energy Phys. ; INFN, Turin) ; Alexeev, M. (INFN, Turin) ; Amoroso, A. (INFN, Turin ; Turin U.) ; Baldini Ferroli, R. (Beijing, Inst. High Energy Phys. ; Frascati) ; Bertani, M. (Frascati) ; Bettoni, D. (INFN, Ferrara) ; Bianchi, F. (INFN, Turin ; Turin U.) ; Calcaterra, A. (Frascati) ; Canale, N. (INFN, Ferrara) ; Capodiferro, M. (Frascati ; INFN, Rome ; Rome U.) et al.
A cylindrical GEM detector is under development, to serve as an upgraded inner tracker at the BESIII spectrometer. It will consist of three layers of cylindrically-shaped triple GEMs surrounding the interaction point. [...]
arXiv:1706.02428.-
2017-07-27 - 6 p.
- Published in : JINST 12 (2017) C07038
Preprint: PDF;
In : Instrumentation for Colliding Beam Physics, Novosibirsk, Russia, 27 Feb - 3 Mar 2017, pp.C07038
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A new $G$-parity violating amplitude in the $J/\psi$ decay?
/ Ferroli, R. Baldini (Frascati) ; De Mori, F. (INFN, Turin ; Turin U.) ; Destefanis, M. (INFN, Turin ; Turin U.) ; Maggiora, M. (INFN, Turin ; Turin U.) ; Pacetti, S. (INFN, Perugia ; Perugia U.) ; Yan, L. (Hefei, CUST) ; Bertani, M. (Frascati) ; Calcaterra, A. (Frascati) ; Felici, G. (Frascati) ; Patteri, P. (Frascati) et al.
The $J/\psi$ meson has negative $G$-parity so that, in the limit of isospin conservation, its decay into $\pi^+\pi^-$ should be purely electromagnetic. However, the measured branching fraction $\mathcal{B}(J/\psi\to\pi^+\pi^-)$ exceeds by more than 3.9 standard deviations the expectation computed according to BaBar data on the $e^+e^-\to\pi^+\pi^-$ cross section. [...]
arXiv:1608.07191.-
2017-02-27 - 11 p.
- Published in : Phys. Rev. D 95 (2017) 034038
Preprint: PDF; External link: Preprint
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