Following a turnover, Bright made a layup to give LSU a 62-60 lead. Jermaine Williams made two free throws to give the Tigers a four-point advantage with 30 seconds to go, but Brandon Dean was fouled on a three-point attempt and made all three free throws to get Arkansas within 64-63 with 25 seconds left.
Williams made one of two free throws with 22 seconds left, but Pargo missed a game-tying three-pointer with 14 seconds to go. LSU rebounded the miss and Williams made two more free throws with 10 seconds left for the final margin.
The loss drops Arkansas to 12-12 overall and 4-8 in the Southeastern Conference. LSU is 14-11 and 4-8.
Arkansas made 14 of 30 shots in the first half (.467) and led 39-37 at the break, despite a 26-point first half by LSU's Ronald Dupree, but the Hogs shot just 25.8 percent in the second period (8-31). LSU was only eight of 22 in the second half (.364) after shooting 55.6 percent in the first half (15-27).
Dupree finished with 30 points and nine rebounds while Bright had 17 points and nine boards.
Dean led Arkansas with 15 points and added six rebounds. Pargo had 11 points and J.J. Sullinger 10 points, five rebounds and six assists. Larry Satchell had five points, seven rebounds and three blocked shots.
In the second half, Arkansas led by seven once, by six twice and by five twice but could never pull away from the Tigers. Three times the Razorbacks had the chance to increase their lead but turned the ball over. UA forced 19 turnovers but lost the ball 12 times.
Arkansas plays host to Alabama on Feb. 20 at 7 p.m. in a game televised by Jefferson-Pilot Sports.