Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

A. Anastasi; D. Babusci; G. Bencivenni; M. Berlowski; C. Bloise; F. Bossi; P. Branchini; A. Budano; L. Caldeira Balkeståhl; B. Cao; F. Ceradini; P. Ciambrone; F. Curciarello; E. Czerwiński; G. D'Agostini; E. Dané; V. De Leo; E. De Lucia; A. De Santis; P. De Simone; A. Di Cicco; A. Di Domenico; R. Di Salvo; D. Domenici; A. D'Uffizi; A. Fantini; G. Felici; S. Fiore; A. Gajos; P. Gauzzi; G. Giardina; S. Giovannella; E. Graziani; F. Happacher; L. Heijkenskjöld; T. Johansson; D. Kamińska; W. Krzemien; A. Kupsc; S. Loffredo; P. A. Lukin; G. Mandaglio; M. Martini; M. Mascolo; R. Messi; S. Miscetti; G. Morello; D. Moricciani; P. Moskal; M. Papenbrock; The KLOE-2 Collaboration

doi:10.1016/j.physletb.2016.12.016

Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

A. Anastasi, D. Babusci, G. Bencivenni, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Dané, V. De Leo, E. De Lucia, A. De Santis, P. De SimoneA. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, A. D'Uffizi, A. Fantini, G. Felici, S. Fiore, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjöld, T. Johansson, D. Kamińska, W. Krzemien, A. Kupsc, S. Loffredo, P. A. Lukin, G. Mandaglio, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, M. Papenbrock, The KLOE-2 Collaboration

Кафедра физики элементарных частиц ФФ

Результат исследования: Научные публикации в периодических изданиях › статья

Аннотация

We have measured the running of the effective QED coupling constant α(s) in the time-like region 0.6<s<0.975 GeV with the KLOE detector at DAΦNE using the Initial-State Radiation process e⁺e⁻→μ⁺μ⁻γ. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the e⁺e⁻→π⁺π⁻ cross section measured by KLOE, the real and imaginary parts of the shift Δα(s) have been extracted. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω→μ⁺μ⁻)=(6.6±1.4_stat±1.7_syst)⋅10⁻⁵ has been determined.

Язык оригинала	английский
Страницы (с-по)	485-492
Число страниц	8
Журнал	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Том	767
DOI	https://doi.org/10.1016/j.physletb.2016.12.016
Состояние	Опубликовано - 10 апр 2017

Доступ к документу

10.1016/j.physletb.2016.12.016

Link to publication in Scopus

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Anastasi, A., Babusci, D., Bencivenni, G., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Caldeira Balkeståhl, L., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., D'Agostini, G., Dané, E., De Leo, V., De Lucia, E., De Santis, A., ... The KLOE-2 Collaboration (2017). Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 767, 485-492. https://doi.org/10.1016/j.physletb.2016.12.016

Anastasi, A. ; Babusci, D. ; Bencivenni, G. ; Berlowski, M. ; Bloise, C. ; Bossi, F. ; Branchini, P. ; Budano, A. ; Caldeira Balkeståhl, L. ; Cao, B. ; Ceradini, F. ; Ciambrone, P. ; Curciarello, F. ; Czerwiński, E. ; D'Agostini, G. ; Dané, E. ; De Leo, V. ; De Lucia, E. ; De Santis, A. ; De Simone, P. ; Di Cicco, A. ; Di Domenico, A. ; Di Salvo, R. ; Domenici, D. ; D'Uffizi, A. ; Fantini, A. ; Felici, G. ; Fiore, S. ; Gajos, A. ; Gauzzi, P. ; Giardina, G. ; Giovannella, S. ; Graziani, E. ; Happacher, F. ; Heijkenskjöld, L. ; Johansson, T. ; Kamińska, D. ; Krzemien, W. ; Kupsc, A. ; Loffredo, S. ; Lukin, P. A. ; Mandaglio, G. ; Martini, M. ; Mascolo, M. ; Messi, R. ; Miscetti, S. ; Morello, G. ; Moricciani, D. ; Moskal, P. ; Papenbrock, M. ; The KLOE-2 Collaboration. / Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector. В: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2017 ; Том 767. стр. 485-492.

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title = "Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector",

abstract = "We have measured the running of the effective QED coupling constant α(s) in the time-like region 0.6+e−→μ+μ−γ. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the e+e−→π+π− cross section measured by KLOE, the real and imaginary parts of the shift Δα(s) have been extracted. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω→μ+μ−)=(6.6±1.4stat±1.7syst)⋅10−5 has been determined.",

keywords = "Vacuum polarization, α running, LUMINOSITY, MUON PAIR PRODUCTION, HADRONIC CROSS-SECTION, FSR, ANGLE BHABHA SCATTERING, VACUUM POLARIZATION, RADIATIVE RETURN, E(+)E(-), arunning",

author = "A. Anastasi and D. Babusci and G. Bencivenni and M. Berlowski and C. Bloise and F. Bossi and P. Branchini and A. Budano and {Caldeira Balkest{\aa}hl}, L. and B. Cao and F. Ceradini and P. Ciambrone and F. Curciarello and E. Czerwi{\'n}ski and G. D'Agostini and E. Dan{\'e} and {De Leo}, V. and {De Lucia}, E. and {De Santis}, A. and {De Simone}, P. and {Di Cicco}, A. and {Di Domenico}, A. and {Di Salvo}, R. and D. Domenici and A. D'Uffizi and A. Fantini and G. Felici and S. Fiore and A. Gajos and P. Gauzzi and G. Giardina and S. Giovannella and E. Graziani and F. Happacher and L. Heijkenskj{\"o}ld and T. Johansson and D. Kami{\'n}ska and W. Krzemien and A. Kupsc and S. Loffredo and Lukin, {P. A.} and G. Mandaglio and M. Martini and M. Mascolo and R. Messi and S. Miscetti and G. Morello and D. Moricciani and P. Moskal and M. Papenbrock and {The KLOE-2 Collaboration}",

year = "2017",

month = apr,

day = "10",

doi = "10.1016/j.physletb.2016.12.016",

language = "English",

volume = "767",

pages = "485--492",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

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Anastasi, A, Babusci, D, Bencivenni, G, Berlowski, M, Bloise, C, Bossi, F, Branchini, P, Budano, A, Caldeira Balkeståhl, L, Cao, B, Ceradini, F, Ciambrone, P, Curciarello, F, Czerwiński, E, D'Agostini, G, Dané, E, De Leo, V, De Lucia, E, De Santis, A, De Simone, P, Di Cicco, A, Di Domenico, A, Di Salvo, R, Domenici, D, D'Uffizi, A, Fantini, A, Felici, G, Fiore, S, Gajos, A, Gauzzi, P, Giardina, G, Giovannella, S, Graziani, E, Happacher, F, Heijkenskjöld, L, Johansson, T, Kamińska, D, Krzemien, W, Kupsc, A, Loffredo, S, Lukin, PA, Mandaglio, G, Martini, M, Mascolo, M, Messi, R, Miscetti, S, Morello, G, Moricciani, D, Moskal, P, Papenbrock, M & The KLOE-2 Collaboration 2017, 'Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, том. 767, стр. 485-492. https://doi.org/10.1016/j.physletb.2016.12.016

Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector. / Anastasi, A.; Babusci, D.; Bencivenni, G.; Berlowski, M.; Bloise, C.; Bossi, F.; Branchini, P.; Budano, A.; Caldeira Balkeståhl, L.; Cao, B.; Ceradini, F.; Ciambrone, P.; Curciarello, F.; Czerwiński, E.; D'Agostini, G.; Dané, E.; De Leo, V.; De Lucia, E.; De Santis, A.; De Simone, P.; Di Cicco, A.; Di Domenico, A.; Di Salvo, R.; Domenici, D.; D'Uffizi, A.; Fantini, A.; Felici, G.; Fiore, S.; Gajos, A.; Gauzzi, P.; Giardina, G.; Giovannella, S.; Graziani, E.; Happacher, F.; Heijkenskjöld, L.; Johansson, T.; Kamińska, D.; Krzemien, W.; Kupsc, A.; Loffredo, S.; Lukin, P. A.; Mandaglio, G.; Martini, M.; Mascolo, M.; Messi, R.; Miscetti, S.; Morello, G.; Moricciani, D.; Moskal, P.; Papenbrock, M.; The KLOE-2 Collaboration.

В: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Том 767, 10.04.2017, стр. 485-492.

Результат исследования: Научные публикации в периодических изданиях › статья

TY - JOUR

T1 - Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

AU - Anastasi, A.

AU - Babusci, D.

AU - Bencivenni, G.

AU - Berlowski, M.

AU - Bloise, C.

AU - Bossi, F.

AU - Branchini, P.

AU - Budano, A.

AU - Caldeira Balkeståhl, L.

AU - Cao, B.

AU - Ceradini, F.

AU - Ciambrone, P.

AU - Curciarello, F.

AU - Czerwiński, E.

AU - D'Agostini, G.

AU - Dané, E.

AU - De Leo, V.

AU - De Lucia, E.

AU - De Santis, A.

AU - De Simone, P.

AU - Di Cicco, A.

AU - Di Domenico, A.

AU - Di Salvo, R.

AU - Domenici, D.

AU - D'Uffizi, A.

AU - Fantini, A.

AU - Felici, G.

AU - Fiore, S.

AU - Gajos, A.

AU - Gauzzi, P.

AU - Giardina, G.

AU - Giovannella, S.

AU - Graziani, E.

AU - Happacher, F.

AU - Heijkenskjöld, L.

AU - Johansson, T.

AU - Kamińska, D.

AU - Krzemien, W.

AU - Kupsc, A.

AU - Loffredo, S.

AU - Lukin, P. A.

AU - Mandaglio, G.

AU - Martini, M.

AU - Mascolo, M.

AU - Messi, R.

AU - Miscetti, S.

AU - Morello, G.

AU - Moricciani, D.

AU - Moskal, P.

AU - Papenbrock, M.

AU - The KLOE-2 Collaboration

PY - 2017/4/10

Y1 - 2017/4/10

N2 - We have measured the running of the effective QED coupling constant α(s) in the time-like region 0.6+e−→μ+μ−γ. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the e+e−→π+π− cross section measured by KLOE, the real and imaginary parts of the shift Δα(s) have been extracted. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω→μ+μ−)=(6.6±1.4stat±1.7syst)⋅10−5 has been determined.

AB - We have measured the running of the effective QED coupling constant α(s) in the time-like region 0.6+e−→μ+μ−γ. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the e+e−→π+π− cross section measured by KLOE, the real and imaginary parts of the shift Δα(s) have been extracted. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω→μ+μ−)=(6.6±1.4stat±1.7syst)⋅10−5 has been determined.

KW - Vacuum polarization

KW - α running

KW - LUMINOSITY

KW - MUON PAIR PRODUCTION

KW - HADRONIC CROSS-SECTION

KW - FSR

KW - ANGLE BHABHA SCATTERING

KW - VACUUM POLARIZATION

KW - RADIATIVE RETURN

KW - E(+)E(-)

KW - arunning

UR - http://www.scopus.com/inward/record.url?scp=85014040536&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2016.12.016

DO - 10.1016/j.physletb.2016.12.016

M3 - Article

VL - 767

SP - 485

EP - 492

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

SN - 0370-2693

ER -