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Two-pion Bose-Einstein correlations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math>collisions at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>900</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:math>
We report on the measurement of two-pion correlation functions from $pp$ collisions at $\sqrt{s}=900\text{ }\text{ }\mathrm{GeV}$ performed by the ALICE experiment at the Large Hadron Collider. Our analysis shows an increase of the Hanbury Brown--Twiss radius with increasing event multiplicity, in line with other measurements done in particle- and nuclear …