Dylan Hartley’s England World Cup hopes in balance after being cited

• Northampton hooker faces disciplinary panel for striking opponent with head• Saints captain could miss World Cup if found guilty and banned• Saracens beat Northampton to reach Premiership finalDylan Hartley, the England and Northampton hooker, could be in danger of missing the World Cup after being cited for foul play.The Rugby Football Union said Hartley will appear before a three-man disciplinary panel in Coventry on Wednesday evening after he was reported for striking an opponent with his head during Saturday’s Premiership play-off semi-final between Northampton and Saracens, which Sarace…