Cross-section measurement of two-photon in-flight annihilation of positrons at p s=20 MeV with the PADME detector

被引：2

作者：

Bossi, F. ^{[1
]}

Branchini, P. ^{[2
]}

Buonomo, B.

Capirossi, V. ^{[3
,4
]}

Caricato, A. P. ^{[5
,6
]}

Chiodini, G. ^{[5
]}

De Sangro, R. ^{[1
]}

Di Giulio, C.

Domenici, D. ^{[1
]}

Ferrarotto, F. ^{[7
]}

Finocchiaro, G. ^{[1
]}

Foggetta, L. G. ^{[1
]}

Frankenthal, A. ^{[8
]}

Garattini, M. ^{[1
]}

Georgiev, G. ^{[9
,10
]}

Giacchino, F. ^{[1
,12
]}

Gianotti, P. ^{[1
]}

Ivanov, S. ^{[10
]}

Ivanov, Sv.

Kozhuharov, V. ^{[1
,10
]}

Leonardi, E.

Long, E. ^{[11
]}

Martino, M. ^{[5
,6
]}

Oceano, I. ^{[5
,6
]}

Oliva, F. ^{[5
,6
,13
]}

Organtini, G. C. ^{[7
]}

Pinna, F.

Piperno, G. ^{[11
]}

Raggi, M. ^{[7
]}

Sarra, I. ^{[1
]}

Simeonov, R.

Spadaro, T. ^{[1
]}

Spagnolo, S. ^{[5
,6
]}

Spiriti, E. ^{[1
]}

Tagnani, D. ^{[2
]}

Taruggi, C. ^{[1
]}

Valente, P. ^{[7
]}

Vilucchi, E. ^{[5
]}

机构：

[1] Ist Nazl Fis Nucl, Lab Nazl Frascati, Via E Fermi 54, I-00044 Frascati, Italy

[2] Ist Nazl Fis Nucl, Sez Roma 3, Via Vasca Navale 84, I-00146 Rome, Italy

[3] DISAT Politecn Torino, Cso Duca Abruzzi 24, I-10129 Turin, Italy

[4] Ist Nazl Fis Nucl, Sez Torino, Cso Duca Abruzzi 24, I-10129 Turin, Italy

[5] Ist Nazl Fis Nucl, Sez Lecce, Via Prov Arnesano, I-73100 Lecce, Italy

[6] Salento Univ, Dipartimento Matemat & Fis, Via Prov Arnesano, I-73100 Lecce, Italy

[7] Ist Nazl Fis Nucl, Sez Roma 1, Ple A Moro 2, I-00185 Rome, Italy

[8] Princeton Univ, Phys Dept, Washington Rd, Princeton, NJ 08540 USA

[9] INRNE Bulgarian Acad Sci, 72 Tsarigradsko Shosse Blvd, Sofia 1784, Bulgaria

[10] Sofia Univ St Kl Ohridski, Fac Phys, 5J Bourchier Blvd, Sofia 1164, Scotland

[11] Sapienza Univ, Dipartimento Fis, Ple A Moro 2, I-00185 Rome, Italy

[12] INFN, Sez Roma 2, Via Ric Scientif 1, Rome, Italy

[13] Edin burgh Univ, Sch Phys & Astron, Edinburgh, Midlothian, Scotland

来源：

PHYSICAL REVIEW D | 2023年 / 107卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.107.012008

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A measurement of the inclusive cross section of in-flight electron-positron annihilation to photons, e+e- -> gamma gamma, is presented using the PADME detector at the Laboratori Nazionali di Frascati. A beam of 430 MeV positrons, corresponding to a center-of-mass energy of 20 MeV, strikes a thin diamond target. The two photons produced in the interaction are detected by an electromagnetic calorimeter made of BGO crystals. The measurement is the first based on direct detection of the photon pair and one of the most precise for positron energies below 1 GeV. It represents an intermediate step in the ultimate PADME goal of searching for dark sector particles and mediators weakly coupled to photons and electrons, with masses ranging from 1 to 20 MeV. The final value, sigma e+e-->gamma gamma = (1.977 +/- 0.018(stat) +/- 0.119(syst)) mb, agrees with next-to-leading-order QED predictions within the 6% experimental uncertainty.

引用

页数：11

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