By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- European stock markets staged broad-based losses on Tuesday, after some investors were disappointed that the Bank of Japan refrained from taking fresh steps to boost the economy, adding to anxiety about reduced easing from central banks globally.

Investors were also cautious as a two-day hearing on the legality of the European Central Bank's bond-buying program got under way in Germany's constitutional court.

The Stoxx Europe 600 index lost 1.2% to close at 291.74, marking the second straight day in the red.

Earlier in the year, the index climbed to a multiyear high, buoyed by aggressive easing from central banks. But over the past weeks, it has declined on worries the U.S. Federal Reserve will reduce its asset purchases. The index has lost about 6% since its almost five-year high on May 22, when Fed Chairman Ben Bernanke spooked investors with comments about tapering quantitative easing if data continue to improve.

"The recent optimism has not really been justified and you can see that by today's reaction," said Predrag Dukic, senior equity sales trader at CM Capital Markets in Madrid. "Something we forget to look at is fundamentals and when we look at growth, budget deficits and unemployment [in the euro zone], all these factors are not giving us much hope for a significant recovery. Greece, Spain, Italy and perhaps even France are still countries that have a lot of work to do and they have not done enough to justify the rally we had."

"The markets will not correct greatly though--this is simply pricing in QE3 stopping and we obviously got the holiday season coming and people may be looking ahead to the summer and unwinding their positions before their vacations," he added.

Among notable movers in the pan-European index, shares of ICAP PLC gave up 3.6% after Credit Suisse cut the interdealer broker to underperform from neutral.

Mining firms were also lower, as metals prices dropped across the board. Shares of Anglo American PLC fell 3.5%, BHP Billiton PLC (BHP) gave up 1.6% and Rio Tinto PLC (RIO) shaved off 1.4%.

Bank of Japan fails to boost optimism

For the broader European stock markets, investors took a hint from Asia, where most bourses closed in the red after the Bank of Japan's decision to keep its asset-buying and other policy elements unchanged. The lack of action was widely expected, though some market participants had hoped the central bank would extend its low-price fund-supplying operation. The yen rose sharply against the dollar after the decision and pushed stocks lower.

"By not announcing new easing measures today, BOJ has probably done itself a favor in the long run. The economy is moving in the right direction, and so far the correction in the financial markets is not a threat to the recovery," analysts at Danske Bank said in a note.

"It is important to understand that despite no announcement today, BOJ is still easing aggressively. A massive amount of liquidity will continue to be injected into the economy over the coming months and monetary easing is still at an early stage," they added.

In the U.S., stocks traded with minor losses, as worries the Federal Reserve will begin to taper its quantitative easing program continued to haunt investors.

Back in Europe, the ECB's Outright Monetary Transactions program was in the spotlight, as a two-day court hearing got under way in Germany's constitutional court. The hearing focuses on the legitimacy of the program, which the Bundesbank and several politicians say undermines central bank independence and infringes on a ban of monetary financing. See: High Noon for the euro in Karlsruhe court

ECB President Mario Draghi said in an interview with German television that "not a single cent has been spent" on the program, but just the existence of such a mechanism is mainly responsible for the easing fears of the euro zone breaking up. Read: Just say no to ECB bond-buying: Buba chief

After the OMT announcement last summer, government bond yields for struggling euro-zone countries such as Spain and Italy have come down significantly, while the stock Stoxx 600 in May closed higher for a 12th consecutive month.

Movers

Most indexes, however, tanked on Tuesday, with Greece's Athex Composite down 4.7% at 895.86. Reuters reported that the country will miss its asset sale target by about 1 billion euros ($1.3 billion) this year, after Russian energy giant Gazprom withdrew its interest in Greece's natural gas firm DEPA on Monday. See: That hissing noise out of Greece could mean trouble for the euro zone

Germany's DAX 30 index dropped 1% to 8,222.46, weighed by Deutsche Bank AG (DB), down 2%.

On a more upbeat note in Germany, shares of Infineon Technologies AG climbed 3.3% after Citigroup lifted the chip maker to buy from neutral, according to Dow Jones Newswires.

France's CAC 40 index gave up 1.4% to 3,810.56. Shares of LeGrand SA slumped 4.1% after investment firm Wendel said it completed the sale of its remaining 5.4% stake the French electrical-equipment company.

The U.K.'s FTSE 100 index slid 0.9% to 6,340.08.

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