MAKING ENDS MEET - STRING UNIFICATION AND LOW-ENERGY DATA

被引:67
作者
DIENES, KR
FARAGGI, AE
机构
[1] School of Natural Sciences, Institute for Advanced Study, Princeton, NJ 08540, Olden Lane
关键词
D O I
10.1103/PhysRevLett.75.2646
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We examine the effects that may resolve the disagreement between string-scale unification and low-energy data. ?These include string threshold corrections, nonstandard hypercharge normalizations. Light supersymmetric thresholds, intermediate gauge structure, and extra matter beyond the minimal supersymmetric standard model. We explicitly evaluate these effects within the flipped SU(5), SO(6) X SO(3), and various SU(3) X SU(2) X U(1) string models, and surprisingly find that the only way to reconcile string unification with low-energy data is through certain types of extra matter. Remarkably, many of the realistic string models contain precisely this required matter in their massless spectra.
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页码:2646 / 2649
页数:4
相关论文
共 17 条
[1]   4-DIMENSIONAL SUPERSTRINGS [J].
ANTONIADIS, I ;
BACHAS, CP ;
KOUNNAS, C .
NUCLEAR PHYSICS B, 1987, 289 (01) :87-108
[2]   A 3-GENERATION SU(4)XO(4) STRING MODEL [J].
ANTONIADIS, I ;
LEONTARIS, GK ;
RIZOS, J .
PHYSICS LETTERS B, 1990, 245 (02) :161-168
[3]   STRING THRESHOLD CORRECTIONS AND FLIPPED SU(5) [J].
ANTONIADIS, I ;
ELLIS, J ;
LACAZE, R ;
NANOPOULOS, DV .
PHYSICS LETTERS B, 1991, 268 (02) :188-196
[4]  
DIENES KR, IASSNSHEP9525 REP
[5]  
DIENES KR, IASSNSHEP94113 REP
[6]   CUSTODIAL NONABELIAN GAUGE SYMMETRIES IN REALISTIC SUPERSTRING DERIVED MODELS [J].
FARAGGI, AE .
PHYSICS LETTERS B, 1994, 339 (03) :223-231
[7]   A NEW STANDARD-LIKE MODEL IN THE 4-DIMENSIONAL FREE FERMIONIC STRING FORMULATION [J].
FARAGGI, AE .
PHYSICS LETTERS B, 1992, 278 (1-2) :131-139
[8]   FRACTIONAL CHARGES IN A SUPERSTRING-DERIVED STANDARD-LIKE MODEL [J].
FARAGGI, AE .
PHYSICAL REVIEW D, 1992, 46 (07) :3204-3207
[9]   GAUGE COUPLING UNIFICATION IN SUPERSTRING DERIVED STANDARD-LIKE MODELS [J].
FARAGGI, AE .
PHYSICS LETTERS B, 1993, 302 (2-3) :202-208
[10]   ANALYSIS OF RUNNING COUPLING-CONSTANT UNIFICATION IN STRING THEORY [J].
GAILLARD, MK ;
XIU, RL .
PHYSICS LETTERS B, 1992, 296 (1-2) :71-76