Tversky and Kahneman in the70 s in a series of articles achieved to the development of applications of psychological knowledge in finance and economy and these research gradually became known as behavioral finance in the 90s as a field of financial matters. This school of thought with find inability to existing models, which are based on full rationality and lack of arbitrage turned to psychology and the science of decision making and by using a combination of these science and finance gain a better understanding of investment activity in the financial markets. The development of this approach has led the scientists noticed a behavior in investors that are inconsistent with the classic financial theories. These characteristics known as behavioral biases that explaining the systematic errors in people judgment. In recent years the nuclear talks and the progress or lack of progress always caused reactions by players in capital market of Iran. The discussion has became more serious in the second half of 1392, ie since the beginning of negotiations in New York and all market indicators, including indices, volume and value of transactions was increasingly affected by this event. In this study, it was determined that what is the reaction of active players in the capital market according to the news and rumors about nuclear talks and which of behavioral biases exist in their transactions. Therefore, after making a list of behavioral biases in a questionnaire, the experts commented about those and results and were analyzed and ranked using TOPSIS.
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