The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at root s = 0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45 < p(t) < 1.05 GeV/c and rapidity vertical bar y vertical bar < 0.5. The ratio is measured to be R-vertical bar y vertical bar<0.5 = 0.957 +/- 0.006(stat) +/- 0.0014(syst) at 0.9 Tev and R-vertical bar y vertical bar<0.5 = 0.991 +/- 0.005 +/- 0.014(syst) at 7 TeV and it is independent of both rapidity and transverse momentum. The results are consistent with the conventional model of baryon-number transport and set stringent limits on any additional contributions to baryon-number transfer over very large rapidity intervals in pp collisions.

Midrapidity Antiproton-to-Proton Ratio in pp Collisons root s=0.9 and 7 TeV Measured by the ALICE Experiment / Aamodt, K., Abel, N., Abeysekara, U., Quintana, A.a., Abramyan, A., Adamova, D., Aggarwal, M.m., Rinella, G.a., Agocs, A.g., Salazar, S.a., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S.u., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Molina, R.a., Alici, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 105:7(2010). [10.1103/physrevlett.105.072002]

Midrapidity Antiproton-to-Proton Ratio in pp Collisons root s=0.9 and 7 TeV Measured by the ALICE Experiment

CUNQUEIRO L;MEDDI, Franco;
2010

Abstract

The ratio of the yields of antiprotons to protons in pp collisions has been measured by the ALICE experiment at root s = 0.9 and 7 TeV during the initial running periods of the Large Hadron Collider. The measurement covers the transverse momentum interval 0.45 < p(t) < 1.05 GeV/c and rapidity vertical bar y vertical bar < 0.5. The ratio is measured to be R-vertical bar y vertical bar<0.5 = 0.957 +/- 0.006(stat) +/- 0.0014(syst) at 0.9 Tev and R-vertical bar y vertical bar<0.5 = 0.991 +/- 0.005 +/- 0.014(syst) at 7 TeV and it is independent of both rapidity and transverse momentum. The results are consistent with the conventional model of baryon-number transport and set stringent limits on any additional contributions to baryon-number transfer over very large rapidity intervals in pp collisions.
2010
transverse momentum; ionic collisions; long-range correlations
01 Pubblicazione su rivista::01a Articolo in rivista
Midrapidity Antiproton-to-Proton Ratio in pp Collisons root s=0.9 and 7 TeV Measured by the ALICE Experiment / Aamodt, K., Abel, N., Abeysekara, U., Quintana, A.a., Abramyan, A., Adamova, D., Aggarwal, M.m., Rinella, G.a., Agocs, A.g., Salazar, S.a., Ahammed, Z., Ahmad, A., Ahmad, N., Ahn, S.u., Akimoto, R., Akindinov, A., Aleksandrov, D., Alessandro, B., Molina, R.a., Alici, A., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 105:7(2010). [10.1103/physrevlett.105.072002]
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