KM3NeT is a research infrastructure housing the next generation neutrino detectors in the depths of the Mediterranean Sea. The ARCA detector, which is currently under construction, is optimized for searches for neutrinos from astrophysical sources as well as measurements of the diffuse astrophysical flux. The unambiguous detection of neutrinos of extraterrestrial origin by IceCube has led to the first measurement of a high energy astrophysical neutrino flux. The properties of sea water allow for a measurement of the neutrino direction with an excellent angular resolution for both track and cascade events. Here a method to differentiate track and shower events and a method to reject the atmospheric muon background from starting track-like events are combined in one analysis. The analysis on the discovery potential of KM3NeT/ARCA for a diffuse astrophysical neutrino flux using events with the reconstructed vertex inside the detector volume will be presented.
{"title":"Analysis of vertex-contained high energy neutrino events for the KM3NeT/ARCA detector.","authors":"K. Pikounis, E. Tzamariudaki, F. C. Collaboration","doi":"10.5281/zenodo.1300717","DOIUrl":"https://doi.org/10.5281/zenodo.1300717","url":null,"abstract":"KM3NeT is a research infrastructure housing the next generation neutrino detectors in the depths of the Mediterranean Sea. The ARCA detector, which is currently under construction, is optimized for searches for neutrinos from astrophysical sources as well as measurements of the diffuse astrophysical flux. The unambiguous detection of neutrinos of extraterrestrial origin by IceCube has led to the first measurement of a high energy astrophysical neutrino flux. The properties of sea water allow for a measurement of the neutrino direction with an excellent angular resolution for both track and cascade events. Here a method to differentiate track and shower events and a method to reject the atmospheric muon background from starting track-like events are combined in one analysis. The analysis on the discovery potential of KM3NeT/ARCA for a diffuse astrophysical neutrino flux using events with the reconstructed vertex inside the detector volume will be presented.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78332312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
SHIP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee and by the CERN Research Board. The two boards recommended that the experiment proceeds further to a Comprehensive Design phase. A 400 GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating $2times 10^{20}$ proton-target collisions (textit{pot}) in 5 years. A dedicated detector, based on a long vacuum tank followed by a spectrometer and particle identification detectors, will allow to probe a variety of New Physics models with light long-lived exotic particles and masses below $mathcal{O}(10)$~GeV/$c^2$, including Dark Photons, light scalars and pseudo-scalars, and Heavy Neutrinos. The sensitivity to Heavy Neutrinos will allow for the first time to probe, in the mass range between the $K$ and the $D$ meson mass, a coupling range for which Baryogenesis and neutrino oscillations could also be explained. Another dedicated detector will allow the study of neutrino cross-sections and angular distributions. $nu_tau$ deep inelastic scattering cross sections will be measured with a statistics 1000 times larger than currently available, with the extraction of the so far never measured $F_4$ and $F_5$ structure functions, and allow to perform charm physics studies with significantly improved accuracy.
{"title":"SHiP: a new facility to search for long lived neutral particles and investigate the $nu_tau$ properties","authors":"E. Graverini","doi":"10.5167/UZH-162436","DOIUrl":"https://doi.org/10.5167/UZH-162436","url":null,"abstract":"SHIP is a new general purpose fixed target facility, whose Technical Proposal has been recently reviewed by the CERN SPS Committee and by the CERN Research Board. The two boards recommended that the experiment proceeds further to a Comprehensive Design phase. A 400 GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating $2times 10^{20}$ proton-target collisions (textit{pot}) in 5 years. A dedicated detector, based on a long vacuum tank followed by a spectrometer and particle identification detectors, will allow to probe a variety of New Physics models with light long-lived exotic particles and masses below $mathcal{O}(10)$~GeV/$c^2$, including Dark Photons, light scalars and pseudo-scalars, and Heavy Neutrinos. The sensitivity to Heavy Neutrinos will allow for the first time to probe, in the mass range between the $K$ and the $D$ meson mass, a coupling range for which Baryogenesis and neutrino oscillations could also be explained. Another dedicated detector will allow the study of neutrino cross-sections and angular distributions. $nu_tau$ deep inelastic scattering cross sections will be measured with a statistics 1000 times larger than currently available, with the extraction of the so far never measured $F_4$ and $F_5$ structure functions, and allow to perform charm physics studies with significantly improved accuracy.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79102671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-07-07DOI: 10.1007/978-3-319-73171-1_150
N. Sharma
{"title":"Review of (Anti-)Nuclei Production from High Energy Experiments","authors":"N. Sharma","doi":"10.1007/978-3-319-73171-1_150","DOIUrl":"https://doi.org/10.1007/978-3-319-73171-1_150","url":null,"abstract":"","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76864738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-06-28DOI: 10.5506/APHYSPOLBSUPP.11.447
E. Prencipe
The search for multi-quark states beyond the constituent quark model (CQM) has resulted in the discovery of many new exotic states, starting with the observation of the X(3872), discovered by Belle in 2003. Also in the sector of charm-strange physics the CQM does not seem to describe properly all spectrum, despite of theoretical expectations. These new forms of quark bounds clearly show that mesons and baryons are not the only possibilities to be considered. We shortly report in this paper selected recent results on searching for such states at Belle, with the perspectives in the hadron physics program at the Belle II experiment.
{"title":"Exotics at Belle and perspectives at Belle II","authors":"E. Prencipe","doi":"10.5506/APHYSPOLBSUPP.11.447","DOIUrl":"https://doi.org/10.5506/APHYSPOLBSUPP.11.447","url":null,"abstract":"The search for multi-quark states beyond the constituent quark model (CQM) has resulted in the discovery of many new exotic states, starting with the observation of the X(3872), discovered by Belle in 2003. Also in the sector of charm-strange physics the CQM does not seem to describe properly all spectrum, despite of theoretical expectations. These new forms of quark bounds clearly show that mesons and baryons are not the only possibilities to be considered. We shortly report in this paper selected recent results on searching for such states at Belle, with the perspectives in the hadron physics program at the Belle II experiment.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83331383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-05-02DOI: 10.5506/APhysPolB.49.1335
A. Schwartz
We summarize recent results for charm physics. These results span several categories: charm mixing, indirect (time-dependent) CP violation, direct (time-integrated) CP violation, T violation, semileptonic and leptonic decays, and decays of charm baryons.
{"title":"Charm Physics: another route towards New Physics","authors":"A. Schwartz","doi":"10.5506/APhysPolB.49.1335","DOIUrl":"https://doi.org/10.5506/APhysPolB.49.1335","url":null,"abstract":"We summarize recent results for charm physics. These results span several categories: charm mixing, indirect (time-dependent) CP violation, direct (time-integrated) CP violation, T violation, semileptonic and leptonic decays, and decays of charm baryons.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77512828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-04-10DOI: 10.1051/epjconf/201817111003
R. Preghenella
In these proceedings, I report on a selection of recent LHC results in small systems from ALICE [1], ATLAS [2] and CMS [3] experiments. Due to the fact that the investigation of QCD in small systems at high multiplicity is becoming an increasingly large subject, interesting the heavy-ion community and more in general the high-energy physics community, not all the related topics can be discussed in this paper. The focus will be given to some of the measurements addressing the physics of collective phenomena in small systems and to the recent results on strangeness enhancement in proton-proton collisions. The reader must be informed that a large number of interesting results did not find space in the discussion reported here.
{"title":"Small systems at the LHC","authors":"R. Preghenella","doi":"10.1051/epjconf/201817111003","DOIUrl":"https://doi.org/10.1051/epjconf/201817111003","url":null,"abstract":"In these proceedings, I report on a selection of recent LHC results in small systems from ALICE [1], ATLAS [2] and CMS [3] experiments. Due to the fact that the investigation of QCD in small systems at high multiplicity is becoming an increasingly large subject, interesting the heavy-ion community and more in general the high-energy physics community, not all the related topics can be discussed in this paper. The focus will be given to some of the measurements addressing the physics of collective phenomena in small systems and to the recent results on strangeness enhancement in proton-proton collisions. The reader must be informed that a large number of interesting results did not find space in the discussion reported here.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88544162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Ahmad, Shaista Khan, Ashwini Kumar, Arpit Singh, A. Ahmad, B. Singh
Analysis of high multiplicity events produced in 158A GeV/c $^{208}$Pb-$^{208}$Pb collisions is carried out to study the event-by-event fluctuations. The findings reveal that the method of scaled factorial moments can be used to identify the events having densely populated narrow phase space bins. A few events sorted out adopting this approach are individually analyzed. It is observed that these events do exhibit large fluctuations in their pseudorapidity, $eta$ and azimuthal angle, $phi$ distributions arising out due to some dynamical reasons. Two particle $Deltaeta$-$Deltaphi$ correlation study applied to these events too indicates that some complex two-dimensional structure of significantly high magnitude are present in these events which might have some dynamical origin. The findings reveal that the method of scaled factorial moments may be used as an effective triggering for events with large dynamical fluctuations.
{"title":"Correlations and Event-by-Event Fluctuations in High Multiplicity Events Produced in $^{208}$Pb-$^{208}$Pb Collisions.","authors":"S. Ahmad, Shaista Khan, Ashwini Kumar, Arpit Singh, A. Ahmad, B. Singh","doi":"10.1155/2018/6914627","DOIUrl":"https://doi.org/10.1155/2018/6914627","url":null,"abstract":"Analysis of high multiplicity events produced in 158A GeV/c $^{208}$Pb-$^{208}$Pb collisions is carried out to study the event-by-event fluctuations. The findings reveal that the method of scaled factorial moments can be used to identify the events having densely populated narrow phase space bins. A few events sorted out adopting this approach are individually analyzed. It is observed that these events do exhibit large fluctuations in their pseudorapidity, $eta$ and azimuthal angle, $phi$ distributions arising out due to some dynamical reasons. Two particle $Deltaeta$-$Deltaphi$ correlation study applied to these events too indicates that some complex two-dimensional structure of significantly high magnitude are present in these events which might have some dynamical origin. The findings reveal that the method of scaled factorial moments may be used as an effective triggering for events with large dynamical fluctuations.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85771311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Z. Ahmed, Y. Alexeev, G. Apollinari, A. Arvanitaki, D. Awschalom, K. Berggren, K. Bibber, P. Bienias, G. Bodwin, M. Boshier, D. Bowring, D. Braga, K. Byrum, G. Cancelo, G. Carosi, T. Cecil, C. Chang, M. Checchin, S. Chekanov, A. Chou, A. Clerk, I. Cloet, M. Crisler, M. Demarteau, R. Dharmapalan, M. Dietrich, J. Ding, Z. Djurcic, J. Doyle, J. Fast, M. Fazio, P. Fierlinger, H. Finkel, P. Fox, G. Gabrielse, A. Gaponenko, M. Garcia-Sciveres, A. Geraci, J. Guest, S. Guha, S. Habib, R. Harnik, A. Helmy, Y. Heng, J. Henning, Joseph P. Heremans, P. Ho, J. Hogan, J. Hubmayr, D. Hume, K. Irwin, C. Jenks, N. Karonis, R. Kettimuthu, D. Kimball, J. King, E. Kovacs, R. Kriske, D. Kubik, A. Kusaka, B. Lawrie, K. Lehnert, P. Lett, Jonathan Lewis, P. Lougovski, L. Lurio, Xuedan Ma, E. May, P. Merkel, J. Metcalfe, A. Miceli, M. Min, S. Miryala, J. Mitchell, V. Mitrović, H. Mueller, S. Nam, H. Nguyen, H. Nicholson, A. Nomerotski, M. Norman, Kevin J. O'Brien, R. O’Brient, U. Patel, B. Penning, Sergey Perverzev, N. Peters, R.
Report of the first workshop to identify approaches and techniques in the domain of quantum sensing that can be utilized by future High Energy Physics applications to further the scientific goals of High Energy Physics.
{"title":"Quantum Sensing for High Energy Physics","authors":"Z. Ahmed, Y. Alexeev, G. Apollinari, A. Arvanitaki, D. Awschalom, K. Berggren, K. Bibber, P. Bienias, G. Bodwin, M. Boshier, D. Bowring, D. Braga, K. Byrum, G. Cancelo, G. Carosi, T. Cecil, C. Chang, M. Checchin, S. Chekanov, A. Chou, A. Clerk, I. Cloet, M. Crisler, M. Demarteau, R. Dharmapalan, M. Dietrich, J. Ding, Z. Djurcic, J. Doyle, J. Fast, M. Fazio, P. Fierlinger, H. Finkel, P. Fox, G. Gabrielse, A. Gaponenko, M. Garcia-Sciveres, A. Geraci, J. Guest, S. Guha, S. Habib, R. Harnik, A. Helmy, Y. Heng, J. Henning, Joseph P. Heremans, P. Ho, J. Hogan, J. Hubmayr, D. Hume, K. Irwin, C. Jenks, N. Karonis, R. Kettimuthu, D. Kimball, J. King, E. Kovacs, R. Kriske, D. Kubik, A. Kusaka, B. Lawrie, K. Lehnert, P. Lett, Jonathan Lewis, P. Lougovski, L. Lurio, Xuedan Ma, E. May, P. Merkel, J. Metcalfe, A. Miceli, M. Min, S. Miryala, J. Mitchell, V. Mitrović, H. Mueller, S. Nam, H. Nguyen, H. Nicholson, A. Nomerotski, M. Norman, Kevin J. O'Brien, R. O’Brient, U. Patel, B. Penning, Sergey Perverzev, N. Peters, R.","doi":"10.2172/1437899","DOIUrl":"https://doi.org/10.2172/1437899","url":null,"abstract":"Report of the first workshop to identify approaches and techniques in the domain of quantum sensing that can be utilized by future High Energy Physics applications to further the scientific goals of High Energy Physics.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86642365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Collisions of heavy ion nuclei at relativistic speeds (close to the speed of light) creates a high temperature and very dense form of matter, now known to consist of de-confined quarks and gluons, named the quark gluon plasma (QGP). In this thesis, Run1 experimental data from pp and heavy ion collisions at the CERN LHC is analyzed with the CMS detector. The pp jet cross section is compared with next to leading order theoretical calculations supplemented with non perturbative corrections for three different jet radii highlighting better comparisons for larger radii jets. Measurement of the jet yield followed by the nuclear modification factors in proton-lead at 5.02 TeV and lead-lead collisions at 2.76 TeV are presented. A new data driven technique is introduced to estimate and correct for the fake jet contribution in PbPb for low transverse momenta jets. The nuclear modification factors studied in this thesis show jet quenching to be attributed to final state effects, have a strong correlation to the event centrality, a weak inverse correlation to the jet transverse momenta and an apparent independence on the jet radii in the kinematic range studied. These measurements are compared with leading theoretical model calculations and other experimental results at the LHC leading to unanimous agreement on the qualitative nature of jet quenching. This thesis also features novel updates to the Monte Carlo heavy ion event generator JEWEL (Jet Evolution With Energy Loss) including the boson-jet production channels and also background subtraction techniques to reduce the effect of the thermal background. Keeping track of these jet-medium recoils in JEWEL due to the background subtraction techniques significantly improves its descriptions of several jet structure and sub-structure measurements at the LHC. [Shortened abstract]
{"title":"Jetting Through The Primordial Universe","authors":"R. K. Elayavalli","doi":"10.7282/T3W09926","DOIUrl":"https://doi.org/10.7282/T3W09926","url":null,"abstract":"Collisions of heavy ion nuclei at relativistic speeds (close to the speed of light) creates a high temperature and very dense form of matter, now known to consist of de-confined quarks and gluons, named the quark gluon plasma (QGP). In this thesis, Run1 experimental data from pp and heavy ion collisions at the CERN LHC is analyzed with the CMS detector. The pp jet cross section is compared with next to leading order theoretical calculations supplemented with non perturbative corrections for three different jet radii highlighting better comparisons for larger radii jets. Measurement of the jet yield followed by the nuclear modification factors in proton-lead at 5.02 TeV and lead-lead collisions at 2.76 TeV are presented. A new data driven technique is introduced to estimate and correct for the fake jet contribution in PbPb for low transverse momenta jets. The nuclear modification factors studied in this thesis show jet quenching to be attributed to final state effects, have a strong correlation to the event centrality, a weak inverse correlation to the jet transverse momenta and an apparent independence on the jet radii in the kinematic range studied. These measurements are compared with leading theoretical model calculations and other experimental results at the LHC leading to unanimous agreement on the qualitative nature of jet quenching. This thesis also features novel updates to the Monte Carlo heavy ion event generator JEWEL (Jet Evolution With Energy Loss) including the boson-jet production channels and also background subtraction techniques to reduce the effect of the thermal background. Keeping track of these jet-medium recoils in JEWEL due to the background subtraction techniques significantly improves its descriptions of several jet structure and sub-structure measurements at the LHC. [Shortened abstract]","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76959936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Using a sample of $4.48times10^{8}$ $psi(3686)$ events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons $pi^0$, $eta$, $eta^prime$, $eta(1405)$, $eta(1475)$, $eta(1760)$, and $X(1835)$ in $J/psi$ radiative decays using $psi(3686)topi^{+}pi^{-}J/psi$ events. The $pi^0$, $eta$ and $eta^prime$ mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be $B(J/psitogammapi^{0}to3gamma)=(3.57pm0.12pm0.16)times10^{-5}$, $B(J/psitogammaetato3gamma)=(4.42pm0.04pm0.18)times10^{-4}$, and $B(J/psitogammaeta'to3gamma)=(1.26pm0.02pm0.05)times10^{-4}$, where the first errors are statistical and the second systematic. No clear signal for $eta(1405)$, $eta(1475)$, $eta(1760)$ or $X(1835)$ is observed in the two-photon mass spectra, and upper limits at the $90%$ confidence level on the product branching fractions are obtained.
{"title":"Study of two-photon decays of pseudoscalar mesons via $J/psi$ radiative decays","authors":"Besiii collaboration M.Ablikim, M.N.Achasov, S. Ahmed, M.Albrecht, A.Amoroso, F.F.An, Q.An, J.Z.Bai, Y.Bai, O.Bakina, R. Ferroli, Y.Ban, D.W.Bennett, J.V.Bennett, N.Berger, M.Bertani, D.Bettoni, J.M.Bian, F.Bianchi, E.Boger, I.Boyko, R.A.Briere, H.Cai, X.Cai, O. Cakir, A.Calcaterra, G.F.Cao, S.A.Cetin, J.Chai, J.F.Chang, G.Chelkov, G.Chen, H.S.Chen, J.C.Chen, M.L.Chen, P.L.Chen, S.J.Chen, X.R.Chen, Y.B.Chen, X.K.Chu, G.Cibinetto, H.L.Dai, J.P.Dai, A.Dbeyssi, D.Dedovich, Z.Y.Deng, A.Denig, I.Denysenko, M.Destefanis, F.DeMori, Y.Ding, C.Dong, J.Dong, L.Y.Dong, M.Y.Dong, Z.L.Dou, S.X.Du, P.F.Duan, J.Fang, S.S.Fang, X.Fang, Y.Fang, R.Farinelli, L.Fava, S.Fegan, F.Feldbauer, G.Felici, C.Q.Feng, E.Fioravanti, M. Fritsch, C.D.Fu, Q.Gao, X.L.Gao, Y.Gao, Y.G.Gao, Z.Gao, I.Garzia, K.Goetzen, L.Gong, W.X.Gong, W.Gradl, M.Greco, M.H.Gu, S.Gu, Y.T.Gu, A.Q.Guo, L.B.Guo, R.P.Guo, Y.P.Guo, Z.Haddadi, S.Han, X.Q.Hao, F.A.Harris, K.L.He, X.Q.He, F.H.Heinsius, T.Held, Y.K.Heng, T.Holtmann, Z.L.Hou, C.Hu, H.M.Hu, T.Hu, Y.Hu,","doi":"10.1103/PhysRevD.97.072014","DOIUrl":"https://doi.org/10.1103/PhysRevD.97.072014","url":null,"abstract":"Using a sample of $4.48times10^{8}$ $psi(3686)$ events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons $pi^0$, $eta$, $eta^prime$, $eta(1405)$, $eta(1475)$, $eta(1760)$, and $X(1835)$ in $J/psi$ radiative decays using $psi(3686)topi^{+}pi^{-}J/psi$ events. The $pi^0$, $eta$ and $eta^prime$ mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be $B(J/psitogammapi^{0}to3gamma)=(3.57pm0.12pm0.16)times10^{-5}$, $B(J/psitogammaetato3gamma)=(4.42pm0.04pm0.18)times10^{-4}$, and $B(J/psitogammaeta'to3gamma)=(1.26pm0.02pm0.05)times10^{-4}$, where the first errors are statistical and the second systematic. No clear signal for $eta(1405)$, $eta(1475)$, $eta(1760)$ or $X(1835)$ is observed in the two-photon mass spectra, and upper limits at the $90%$ confidence level on the product branching fractions are obtained.","PeriodicalId":8429,"journal":{"name":"arXiv: High Energy Physics - Experiment","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87183463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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