Publicación

Σ¯± production in pp and p-Pb collisions at sNN=5.02 TeV with ALICE

I. J. Abualrob · S. Acharya · G. Aglieri Rinella · L. Aglietta · M. Agnello · N. Agrawal · Z. Ahammed · S. Ahmad · I. Ahuja · ZUL. Akbar

Resumen

The transverse momentum spectra and integrated yields of anti- $$\Sigma $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>Σ</mml:mi> </mml:math> hyperons ( $$\overline{\Sigma }^{\pm } $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>Σ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>±</mml:mo> </mml:msup> </mml:math> ) have been measured in $$\text {pp}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>pp</mml:mtext> </mml:math> and $$\text {p}{-}\text {Pb}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>p</mml:mtext> <mml:mo>-</mml:mo> <mml:mtext>Pb</mml:mtext> </mml:mrow> </mml:math> collisions at $$\sqrt{s_{\textrm{NN}}}=5.02$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mtext>NN</mml:mtext> </mml:msub> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:mrow> </mml:math> TeV with the ALICE experiment. Measurements are performed via the newly accessed decay channel $$\overline{\Sigma }^{\pm } \!\!\rightarrow \mathrm{\overline{n}} \pi ^{\pm }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mover> <mml:mi>Σ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>±</mml:mo> </mml:msup> <mml:mspace/> <mml:mspace/> <mml:mo>→</mml:mo> <mml:mover> <mml:mi>n</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:mrow> </mml:math> . A new method of antineutron reconstruction with the PHOS electromagnetic spectrometer is developed and applied to this analysis. The $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> spectra of $$\overline{\Sigma }^{\pm } $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>Σ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>±</mml:mo> </mml:msup> </mml:math> are measured in the range $$0.5&lt;p_{\textrm{T}} &lt;3$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mn>0.5</mml:mn> <mml:mo>&lt;</mml:mo> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> <mml:mo>&lt;</mml:mo> <mml:mn>3</mml:mn> </mml:mrow> </mml:math> GeV/ $$c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>c</mml:mi> </mml:math> and compared to predictions of the PYTHIA 8, DPMJET, PHOJET, EPOS LHC and EPOS4 models. The EPOS LHC and EPOS4 models provide the best descriptions of the measured spectra both in $$\text {pp}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mtext>pp</mml:mtext> </mml:math> and $$\text {p}{-}\text {Pb}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mtext>p</mml:mtext> <mml:mo>-</mml:mo> <mml:mtext>Pb</mml:mtext> </mml:mrow> </mml:math> collisions, while models which do not account for multiparton interactions provide a considerably worse description at high $$p_{\textrm{T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>p</mml:mi> <mml:mtext>T</mml:mtext> </mml:msub> </mml:math> . The total yields of $$\overline{\Sigma }^{\pm } $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>Σ</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>±</mml:mo> </mml:msup> </mml:math> in both

Autores y colaboradores

Authors

I. J. Abualrob
S. Acharya
G. Aglieri Rinella
L. Aglietta
M. Agnello
N. Agrawal
Z. Ahammed
S. Ahmad
I. Ahuja
ZUL. Akbar

Palabras clave

STRANGE HADRON-PRODUCTION PROTON-PROTON COLLISIONS MULTIPLICITY DEPENDENCE SIGMA(+) RAPIDITY PION