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Caldeira Balkeståhl, Li
Alternative names
Publications (10 of 62) Show all publications
Caldeira Balkeståhl, L., Elter, Z., Grape, S. & Hellesen, C. (2018). Application of Multivariate Analysis to Gamma and Neutron Signatures from Spent Nuclear Fuel. In: : . Paper presented at 59th Annual Meeting of the Institute of Nuclear Materials Management (INMM), July 22-26 2018, Baltimore, USA.
Open this publication in new window or tab >>Application of Multivariate Analysis to Gamma and Neutron Signatures from Spent Nuclear Fuel
2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-380882 (URN)
Conference
59th Annual Meeting of the Institute of Nuclear Materials Management (INMM), July 22-26 2018, Baltimore, USA
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02
Anastasi, A., Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., . . . Teubner, T. (2018). Combination of KLOE sigma (e(+) e(-) -> pi(+)pi(-) gamma(gamma)) measurements and determination of a(mu)(pi+pi-) in the energy range 0.10 < s < 0.95 GeV2. Journal of High Energy Physics (JHEP) (3), Article ID 173.
Open this publication in new window or tab >>Combination of KLOE sigma (e(+) e(-) -> pi(+)pi(-) gamma(gamma)) measurements and determination of a(mu)(pi+pi-) in the energy range 0.10 < s < 0.95 GeV2
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2018 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 3, article id 173Article in journal (Refereed) Published
Abstract [en]

The three precision measurements of the cross section sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for sigma (e(+)e(-) -> pi(+)pi(-)gamma(gamma)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of a(mu)(pi+pi-) (489.8 +/- 1.7(stat) +/- 4.8(sys)) x 10(-10).

Place, publisher, year, edition, pages
Springer, 2018
Keywords
e plus -e- Experiments
National Category
Subatomic Physics Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-351704 (URN)10.1007/JHEP03(2018)173 (DOI)000429243600001 ()
Available from: 2018-06-04 Created: 2018-06-04 Last updated: 2018-06-04Bibliographically approved
Elter, Z., Caldeira Balkeståhl, L., Grape, S. & Hellesen, C. (2018). Geometry-based Variance Reduction in simulations of Passive Gamma Spectroscopy from Spent Nuclear Fuel. In: : . Paper presented at International Workshop on Numerical Modelling of NDA Instrumentation and Methods for Nuclear Safeguards (NM-NDA-IMNS18). ESARDA. 2018..
Open this publication in new window or tab >>Geometry-based Variance Reduction in simulations of Passive Gamma Spectroscopy from Spent Nuclear Fuel
2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-380889 (URN)
Conference
International Workshop on Numerical Modelling of NDA Instrumentation and Methods for Nuclear Safeguards (NM-NDA-IMNS18). ESARDA. 2018.
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02
Caldeira Balkeståhl, L., Elter, Z., Grape, S. & Hellesen, C. (2018). MCNP simulations of prototype DDSI detector. In: : . Paper presented at International Workshop on Numerical Modelling of NDA Instrumentation and Methods for Nuclear Safeguards (NM-NDA-IMNS18). ESARDA, 2018..
Open this publication in new window or tab >>MCNP simulations of prototype DDSI detector
2018 (English)Conference paper, Oral presentation with published abstract (Other academic)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-380885 (URN)
Conference
International Workshop on Numerical Modelling of NDA Instrumentation and Methods for Nuclear Safeguards (NM-NDA-IMNS18). ESARDA, 2018.
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02
Elter, Z., Caldeira Balkeståhl, L., Grape, S. & Hellesen, C. (2018). Nuclear safeguards verification of modelled BWR fuel using a multivariate analysis approach. In: : . Paper presented at IAEA Symposium on International Safeguards: Building Future Safeguards Capabilities, Nov 5-8, Vienna. 2018..
Open this publication in new window or tab >>Nuclear safeguards verification of modelled BWR fuel using a multivariate analysis approach
2018 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-380891 (URN)
Conference
IAEA Symposium on International Safeguards: Building Future Safeguards Capabilities, Nov 5-8, Vienna. 2018.
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02
Caldeira Balkeståhl, L., Elter, Z., Grape, S. & Hellesen, C. (2018). Nuclear safeguards verification of modelled partial defect PWR fuel using multivariate analysis. In: : . Paper presented at IAEA Symposium on International Safeguards: Building Future Safeguards Capabilities.
Open this publication in new window or tab >>Nuclear safeguards verification of modelled partial defect PWR fuel using multivariate analysis
2018 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-380886 (URN)
Conference
IAEA Symposium on International Safeguards: Building Future Safeguards Capabilities
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02
Elter, Z., Caldeira Balkeståhl, L., Grape, S. & Hellesen, C. (2018). Partial defect identification in PWR spent fuel using Passive Gamma Spectroscopy. In: : . Paper presented at PHYSOR 2018, Cancun, Mexico..
Open this publication in new window or tab >>Partial defect identification in PWR spent fuel using Passive Gamma Spectroscopy
2018 (English)Conference paper, Published paper (Refereed)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-380890 (URN)
Conference
PHYSOR 2018, Cancun, Mexico.
Available from: 2019-04-02 Created: 2019-04-02 Last updated: 2019-04-02
Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., . . . Jegerlehner, F. (2017). Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector. Physics Letters B, 767, 485-492
Open this publication in new window or tab >>Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector
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2017 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 767, p. 485-492Article in journal (Refereed) Published
Abstract [en]

We have measured the running of the effective QED coupling constant alpha(s) in the time-like region 0.6 < root s < 0.975 GeV with the KLOE detector at DA Phi NE using the Initial-State Radiation process e(+) e(-) -> mu(+) mu(-)gamma. It represents the first measurement of the running of alpha(s) in this energy region. Our results show a more than 5 sigma significance of the hadronic contribution to the running of alpha(s), which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the e(+) e(-) -> pi(+) pi(-) cross section measured by KLOE, the real and imaginary parts of the shift Delta alpha(s) have been extracted. From a fit of the real part of Delta alpha(s) and assuming the lepton universality the branching ratio BR(omega -> mu(+) mu(-)) = (6.6 +/- 1.4(stat) +/- 1.7(syst)) (.) 10 (5)has been determined.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV, 2017
Keywords
Vacuum polarization, arunning
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-320023 (URN)10.1016/j.physletb.2016.12.016 (DOI)000397861700074 ()
Funder
EU, FP7, Seventh Framework Programme, FP7-INFRASTRUCTURES2008-1 227431
Note

A KLOE-2 Collaboration

Available from: 2017-04-13 Created: 2017-04-13 Last updated: 2017-11-29Bibliographically approved
Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., . . . Wolke, M. (2016). Limit on the production of a new vector boson in e+e− → Uγ, U → π+π− with the KLOE experiment. Physics Letters B, 757, 356-361
Open this publication in new window or tab >>Limit on the production of a new vector boson in e+e− → Uγ, U → π+π− with the KLOE experiment
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2016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 757, p. 356-361Article in journal (Refereed) Published
Abstract [en]

Abstract The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, ε 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones.

Keywords
Dark matter, Dark forces, Dark photon, U boson
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-289366 (URN)10.1016/j.physletb.2016.04.019 (DOI)000376800300048 ()
Funder
EU, European Research Council, RII3-CT-2004-506078EU, FP7, Seventh Framework Programme, 227431 FP7-INFRASTRUCTURES-2008-1
Available from: 2016-04-29 Created: 2016-04-29 Last updated: 2017-11-30Bibliographically approved
Anastasi, A., Caldeira Balkeståh, L., Cao, B., Heijkenskjöld, L., Ikegami Andersson, W., Johansson, T., . . . Wolke, M. (2016). Measurement of the ϕ→π0e+e− transition form factor with the KLOE detector. Physics Letters B, 757, 362-367
Open this publication in new window or tab >>Measurement of the ϕ→π0e+e− transition form factor with the KLOE detector
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2016 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 757, p. 362-367Article in journal (Refereed) Published
Abstract [en]

A measurement of the vector to pseudoscalar conversion decay ϕ→π0e+e− with the KLOE experiment is presented. A sample of ∼9500 signal events was selected from a data set of 1.7 fb−1 of e+e− collisions at s√∼mϕ collected at the DAΦNE e+e− collider. These events were used to obtain the first measurement of the transition form factor |Fϕπ0(q2)| and a new measurement of the branching ratio of the decay: BR(ϕ→π0e+e−)=(1.35±0.05+0.05−0.10)×10−5. The result improves significantly on previous measurements and is in agreement with theoretical predictions.

Keywords
e(+)e(-) collisions; Conversion decay; Transition form factor
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-289057 (URN)10.1016/j.physletb.2016.04.015 (DOI)000376800300049 ()
Funder
EU, European Research Council, RII3-CT-2004-506078EU, FP7, Seventh Framework Programme, FP7-INFRASTRUCTURES-2008-1 227431
Available from: 2016-04-28 Created: 2016-04-28 Last updated: 2017-11-30Bibliographically approved
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