Limit on the production of a low-mass vector boson in , with the KLOE experiment

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• 作者：A. Anastasi^e ; ^d ; D. Babusci^d ; G. Bencivenni^d ; M. Berlowski^t ; C. Bloise^d ; F. Bossi^d ; P. Branchini^q ; A. Budano^p ; ^q ; L. Caldeira Balkestå ; hl^s ; B. Cao^s ; F. Ceradini^p ; ^q ; P. Ciambrone^d ; F. Curciarello^e ; ^b ; ^k ; E. Czerwiński^c ; G. D'Agostini^l ; ^m ; E. Danè ; ^d ; V. De Leo^q ; E. De Lucia^d ; A. De Santis^d ; P. De Simone^d ; A. Di Cicco^p ; ^q ; A. Di Domenico^l ; ^m ; R. Di Salvo^o ; D. Domenici^d ; A. D'Uffizi^d ; A. Fantiniⁿ ; ^o ; G. Felici^d ; S. Fiore^r ; ^m ; A. Gajos^c ; P. Gauzzi^l ; ^m ; G. Giardina^e ; ^b ; S. Giovannella^d ; E. Graziani^q ; F. Happacher^d ; L. Heijkenskj&ouml ; ld^s ; W. Ikegami Andersson^s ; T. Johansson^s ; D. Kamińska^c ; W. Krzemien^t ; A. Kupsc^s ; S. Loffredo^p ; ^q ; G. Mandaglio^e ; ^f ; M. Martini^d ; ^j ; M. Mascolo^d ; R. Messiⁿ ; ^o ; S. Miscetti^d ; G. Morello^d ; D. Moricciani^o ; P. Moskal^c ; A. Palladino^d ; ¹ ; ^{palladin@bu.edu" class="auth_mail" title="E-mail the corresponding author} ; M. Papenbrock^s ; A. Passeri^q ; V. Pateraⁱ ; ^m ; E. Perez del Rio^d ; A. Ranieri^a ; P. Santangelo^d ; I. Sarra^d ; M. Schioppa^g ; ^h ; M. Silarski^d ; F. Sirghi^d ; L. Tortora^q ; G. Venanzoni^d ; ^{graziano.venanzoni@lnf.infn.it" class="auth_mail" title="E-mail the corresponding author} ; W. Wiślicki^t ; M. Wolke^s
• 关键词：Dark matter ; Dark forces ; Dark photon ; U boson ; A&prime ; A&prime
• 刊名：Physics Letters B
• 出版年：2015
• 出版时间：12 November 2015
• 年：2015
• 卷：750
• 期：Complete
• 页码：633-637
• 全文大小：686 K

文摘

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DAΦNE e⁺${\mathrm{e}}^{+}$e⁻${\mathrm{e}}^{-}$ collider. Using an integrated luminosity of 1.54 fb⁻¹$1.54{\text{fb}}^{-1}$, we studied the process e⁺e⁻→Uγ${\mathrm{e}}^{+}{\mathrm{e}}^{-}\to \mathrm{U}\mathrm{\gamma }$, with U→e⁺e⁻$\mathrm{U}\to {\mathrm{e}}^{+}{\mathrm{e}}^{-}$, using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, ε²${\epsilon }^2$, at 10⁻⁶${10}^{-6}$–10⁻⁴${10}^{-4}$ in the 5–520 MeV/c²$5\text{–}520\text{MeV}/{\text{c}}^2$ mass range.