Soviet emigration authorities have summoned Liza Alexeyeva, the woman whose plight prompted the hunger strike of dissident physicist Andrei Sakharov, to meet them this morning, Alexeyeva said yesterday.

Alexeyeva, the 26-year-old daughter-in-law of Sakharov, has been denied an exit visa to visit her husband by proxy in the United States. She said she did not know what would happen at the meeting with emigration officials.

Sakharov and his wife, Yelena Bonner, were taken, apparently against their will, to the hospital last Friday, on the 13th day of their hunger strike. There was speculation that they are being given preventive medical treatment.

The case of the human rights activist and his wife, meanwhile, drew expressions of international concern.

In London, the British Foreign Office accused the Soviet Union of showing callous disregard for human rights in its treatment of the Sakharovs.

West German Chancellor Helmut Schmidt was reported to have raised the case with Soviet President Leonid Brezhnev in a private meeting during the Kremlin chief's visit to Bonn two weeks ago.

In Oslo, the Nobel Peace Prize Committee accused the Kremlin of violating human rights in the Sakharov case. Sakharov won the peace prize in 1975.