B decay constants from NRQCD with dynamical fermions

被引:15
作者
Collins, S
Heller, UM
Sloan, JH
Shigemitsu, J
Khan, AA
Davies, CTH
机构
[1] FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA
[2] OHIO STATE UNIV, COLUMBUS, OH 43210 USA
关键词
D O I
10.1103/PhysRevD.55.1630
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a lattice investigation of the heavy-light meson decay constants using Wilson light quarks and NRQCD heavy quarks, partially including the effects of dynamical sea quarks. We calculate the pseudoscalar and vector decay constants over a wide range in heavy quark mass and are able to perform a detailed analysis of heavy quark symmetry. We find consistency between the extrapolation of the NRQCD results and the static case, as expected. We find the slope of the decay constants with 1/M is significantly larger than naive expectations and the results of previous lattice calculations. For the first time we extract the nonperturbative coefficients of the slope arising from the O(1/M) heavy quark interactions separately and show the kinetic energy of the heavy quark is dominant and responsible for the large slope. In addition, we find that significant systematic errors remain in the decay constant extracted around the B meson mass due to truncating the NRQCD series at O(1/M). We estimate the higher order contributions to f(B) are approximately 20%, roughly the same size as the systematic errors introduced by using the Wilson action for light quarks.
引用
收藏
页码:1630 / 1642
页数:13
相关论文
共 25 条
[1]  
ALLTON C, 1996, LATTICE 95, V47
[2]   NEXT-TO-LEADING-ORDER CORRECTIONS TO MESON MASSES IN THE HEAVY-QUARK EFFECTIVE THEORY [J].
BALL, P ;
BRAUN, VM .
PHYSICAL REVIEW D, 1994, 49 (05) :2472-2489
[3]   QUENCHED HEAVY-LIGHT DECAY CONSTANTS [J].
BAXTER, RM ;
BOOTH, SP ;
BOWLER, KC ;
COLLINS, S ;
HENTY, DS ;
KENWAY, RD ;
RICHARDS, DG ;
SHANAHAN, HP ;
SIMONE, JN ;
SIMPSON, AD ;
WILKES, BE ;
EWING, AK ;
LELLOUCH, L ;
SACHRAJDA, CT ;
WITTIG, H .
PHYSICAL REVIEW D, 1994, 49 (03) :1594-1605
[4]   LATTICE COMPUTATION OF THE DECAY CONSTANTS OF B-MESONS AND D-MESONS [J].
BERNARD, CW ;
LABRENZ, JN ;
SONI, A .
PHYSICAL REVIEW D, 1994, 49 (05) :2536-2566
[5]   HADRON SPECTRUM IN QCD WITH VALENCE WILSON FERMIONS AND DYNAMIC STAGGERED FERMIONS AT 6/G2=5.6 [J].
BITAR, KM ;
DEGRAND, T ;
EDWARDS, R ;
GOTTLIEB, S ;
HELLER, UM ;
KENNEDY, AD ;
KOGUT, JB ;
KRASNITZ, A ;
LIU, W ;
OGILVIE, MC ;
RENKEN, RL ;
ROSSI, P ;
SINCLAIR, DK ;
SUGAR, RL ;
TOUSSAINT, D ;
WANG, KC .
PHYSICAL REVIEW D, 1992, 46 (05) :2169-2178
[6]  
BOOTH MJ, UFIFTHEP9410
[7]   B spectroscopy from NRQCD with dynamical fermions [J].
Collins, S ;
Heller, UM ;
Sloan, JH ;
Shigemitsu, J ;
Khan, AA ;
Davies, CTH .
PHYSICAL REVIEW D, 1996, 54 (09) :5777-5794
[8]  
COLLINS S, UNPUB
[9]   First lattice calculation of the B-meson binding and kinetic energies [J].
Crisafulli, M ;
Gimenez, V ;
Martinelli, G ;
Sachrajda, CT .
NUCLEAR PHYSICS B, 1995, 457 (03) :594-618
[10]   PRECISION UPSILON-SPECTROSCOPY FROM NONRELATIVISTIC LATTICE QCD [J].
DAVIES, CTH ;
HORNBOSTEL, K ;
LANGNAU, A ;
LEPAGE, GP ;
LIDSEY, A ;
SHIGEMITSU, J ;
SLOAN, J .
PHYSICAL REVIEW D, 1994, 50 (11) :6963-6977