| Autor: |
D. Walz, E. Piasetzky, M. M. Dalton, A.C. Odian, C. Field, J. McDonald, Eric L. N. Jensen, R. Michaels, Bogdan Wojtsekhowski, J. Bono, Ishay Pomerantz, L. Selvy, J. O. Hansen, K. Bartlett, M. Oriunno, Philip Schuster, T. Holmstrom, T. Averett, R. Partridge, Vladimir Nelyubin, C. W. de Jager, R. Essig, R. Subedi, J. A. Jaros, Yujie Qiang, Neil Goeckner-Wald, Natalia Toro, S. Riordan, Y. Roblin, A. Barbieri, A. Kelleher, Pete Markowitz, Z. Ahmed, M. Khandaker, V. Maxwell, A. Camsonne, J. LeRose, D. Anez, J. Segal, T. Maruyama, James Boyce, E. Long, J. Huang, M. Paolone, S. Mayilyan, Jie Zhang, James Baker Beacham, E. Folts, Kalyan Allada, M. T. Graham, Douglas Higinbotham, B. Sawatzky, K.C. Moffeit, R. A. Lindgren, S. Abrahamyan, J. Donaghy, Ashot Gasparian, Vincent Sulkosky, S. Stepanyan, Nilanga Liyanage, J. Gomez, P. Brindza, Kyle Cranmer, Juliette Mammei, A. Shahinyan, S. Iqbal |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Physical Review Letters. 107 |
| ISSN: |
1079-7114
0031-9007 |
| Popis: |
We present a search at the Jefferson Laboratory for new forces mediated by sub-GeV vector bosons with weak coupling α' to electrons. Such a particle A' can be produced in electron-nucleus fixed-target scattering and then decay to an e + e- pair, producing a narrow resonance in the QED trident spectrum. Using APEX test run data, we searched in the mass range 175-250 MeV, found no evidence for an A'→ e+ e- reaction, and set an upper limit of α'/α ~/= 10(-6). Our findings demonstrate that fixed-target searches can explore a new, wide, and important range of masses and couplings for sub-GeV forces. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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