Observation of in-medium modifications of the omega meson.

Observation of in-medium modifications of the omega meson.
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DOI：
10.1103/physrevlett.94.192303
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发表时间：
2005-04
期刊：
Physical Review Letters
影响因子：
8.6
通讯作者：
D. Trnka;G. Anton;J. Bacelar;O. Bartholomy;D. Bayadilov;Y. Beloglazov;R. Bogendorfer;R. Castelijns;V. Crede;H. Dutz;A. Ehmanns;D. Elsner;R. Ewald;I. Fabry;M. Fuchs;K. Essig;C. Funke;R. Gothe;R. Gregor;A. Gridnev;E. Gutz;S. Höffgen;P. Hoffmeister;I. Horn;J. Hossl;I. Jaegle;J. Junkersfeld;H. Kalinowsky;F. Klein;F. Klein;E. Klempt;M. Konrad;B. Kopf;M. Kotulla;B. Krusche;J. Langheinrich;H. Löhner;I. Lopatin;J. Lotz;S. Lugert;D. Menze;J. Messchendorp;T. Mertens;V. Metag;C. Morales;M. Nanova;R. Novotný;M. Ostrick;L. Pant;H. V. Pee;M. Pfeiffer;A. Roy;A. Radkov;S. Schadmand;C. Schmidt;H. Schmieden;B. Schoch;S. Shende;G. Suft;V. Sumachev;T. Szczepanek;A. Süle;U. Thoma;R. Varma;D. Walther;C. Weinheimer;C. Wendel
D. Trnka;G. Anton;J. Bacelar;O. Bartholomy;D. Bayadilov;Y. Beloglazov;R. Bogendorfer;R. Castelijns;V. Crede;H. Dutz;A. Ehmanns;D. Elsner;R. Ewald;I. Fabry;M. Fuchs;K. Essig;C. Funke;R. Gothe;R. Gregor;A. Gridnev;E. Gutz;S. Höffgen;P. Hoffmeister;I. Horn;J. Hossl;I. Jaegle;J. Junkersfeld;H. Kalinowsky;F. Klein;F. Klein;E. Klempt;M. Konrad;B. Kopf;M. Kotulla;B. Krusche;J. Langheinrich;H. Löhner;I. Lopatin;J. Lotz;S. Lugert;D. Menze;J. Messchendorp;T. Mertens;V. Metag;C. Morales;M. Nanova;R. Novotný;M. Ostrick;L. Pant;H. V. Pee;M. Pfeiffer;A. Roy;A. Radkov;S. Schadmand;C. Schmidt;H. Schmieden;B. Schoch;S. Shende;G. Suft;V. Sumachev;T. Szczepanek;A. Süle;U. Thoma;R. Varma;D. Walther;C. Weinheimer;C. Wendel
中科院分区：
物理与天体物理1区
文献类型：
--
作者：
D. Trnka;G. Anton;J. Bacelar;O. Bartholomy;D. Bayadilov;Y. Beloglazov;R. Bogendorfer;R. Castelijns;V. Crede;H. Dutz;A. Ehmanns;D. Elsner;R. Ewald;I. Fabry;M. Fuchs;K. Essig;C. Funke;R. Gothe;R. Gregor;A. Gridnev;E. Gutz;S. Höffgen;P. Hoffmeister;I. Horn;J. Hossl;I. Jaegle;J. Junkersfeld;H. Kalinowsky;F. Klein;F. Klein;E. Klempt;M. Konrad;B. Kopf;M. Kotulla;B. Krusche;J. Langheinrich;H. Löhner;I. Lopatin;J. Lotz;S. Lugert;D. Menze;J. Messchendorp;T. Mertens;V. Metag;C. Morales;M. Nanova;R. Novotný;M. Ostrick;L. Pant;H. V. Pee;M. Pfeiffer;A. Roy;A. Radkov;S. Schadmand;C. Schmidt;H. Schmieden;B. Schoch;S. Shende;G. Suft;V. Sumachev;T. Szczepanek;A. Süle;U. Thoma;R. Varma;D. Walther;C. Weinheimer;C. Wendel

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利用位于波恩的ELSA标记光子设施的水晶桶/TAPS实验研究了原子核上的欧米茄介子的光产生。目的是通过反应γ +A -< ω +X- <pi(0) γ +X- '来研究介子在介质中可能的修饰。对Nb的测量结果与LH2靶上的参考测量结果进行了比较。而对于在原子核外衰变的反冲、长寿命介子(pi（0)、eta和eta（’）），没有观察到两个数据样本的线形差异，我们发现在Nb靶上产生的ω介子的低质量有显著增强。对于小于500 MeV/c的动量，在估计平均核密度为0.6 rho(0)的情况下，推导出M-medium=[722(-4)(+4)(stat)(-5)(+35)(syst)] MeV/c(2)的中欧米伽介子质量。
The photoproduction of omega mesons on nuclei has been investigated using the Crystal Barrel/TAPS experiment at the ELSA tagged photon facility in Bonn. The aim is to study possible in-medium modifications of the omega meson via the reaction gamma+A -<omega+X -<pi(0)gamma+X-`. Results obtained for Nb are compared to a reference measurement on a LH2 target. While for recoiling, long-lived mesons (pi(0), eta, and eta(`)), which decay outside of the nucleus, a difference in the line shape for the two data samples is not observed, we find a significant enhancement towards lower masses for omega mesons produced on the Nb target. For momenta less than 500 MeV/c an in-medium omega meson mass of M-medium=[722(-4)(+4)(stat)(-5)(+35)(syst)] MeV/c(2) has been deduced at an estimated average nuclear density of 0.6 rho(0).