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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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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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The beam and detector of the NA62 experiment at CERN
/ NA62 Collaboration
NA62 is a fixed-target experiment at the CERN SPS dedicated to measurements of rare kaon decays. Such measurements, like the branching fraction of the $K^{+} \rightarrow \pi^{+} \nu \bar\nu$ decay, have the potential to bring significant insights into new physics processes when comparison is made with precise theoretical predictions. [...]
arXiv:1703.08501.-
2017-05-31 - 121 p.
- Published in : JINST 12 (2017) P05025
Fulltext: arXiv:1703.08501 - PDF; 10.1088_1748-0221_12_05_P05025 - PDF; IOP OA article: PDF;
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Search for heavy neutral lepton production in $K^+$ decays
/ NA62 Collaboration
A search for heavy neutral lepton production in $K^+$ decays using a data sample collected with a minimum bias trigger by the NA62 experiment at CERN in 2015 is reported. Upper limits at the $10^{-7}$ to $10^{-6}$ level are established on the elements of the extended neutrino mixing matrix $|U_{\ell 4}|^2$ ($\ell=e,\mu$) for heavy neutral lepton mass in the range $170-448~{\rm MeV}/c^2$. [...]
arXiv:1712.00297; CERN-EP-2017-311.-
Geneva : CERN, 2018-03-10 - 9 p.
- Published in : Phys. Lett. B 778 (2018) 137-145
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: arXiv:1712.00297 - PDF; CERN-EP-2017-311 - PDF;
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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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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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Search for $K^+$ decays to a muon and invisible particles
/ NA62 Collaboration
The NA62 experiment at CERN reports searches for $K^+\to\mu^+N$ and $K^+\to\mu^+\nu X$ decays, where $N$ and $X$ are massive invisible particles, using the 2016-2018 data set. The $N$ particle is assumed to be a heavy neutral lepton, and the results are expressed as upper limits of ${\cal O}(10^{-8})$ of the neutrino mixing parameter $|U_{\mu4}|^2$ for $N$ masses in the range 200-384 MeV/$c^2$ and lifetime exceeding 50 ns. [...]
arXiv:2101.12304; CERN-EP-2021-018.-
Geneva : CERN, 2021-05-10 - 10 p.
- Published in : Phys. Lett. B 816 (2021) 136259
Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 2101.12304 - PDF; CERN-EP-2021-018 - PDF;
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