Mid-rapidity anti-baryon to baryon ratios in pp collisions at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV measured by ALICE - INSPIRE

DataBETA

Mid-rapidity anti-baryon to baryon ratios in pp collisions at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV measured by ALICE

ALICE

Collaboration

May 7, 2013

33 pages

Published in:

Eur.Phys.J.C 73 (2013) 2496

Published: 2013

e-Print:

1305.1562 [nucl-ex]

DOI:

10.1140/epjc/s10052-013-2496-5

Report number:

CERN-PH-EP-2013-080

Experiments:

CERN-LHC-ALICE

View in:

reference search69 citations

Citations per year

Abstract: (Springer)

The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for , , and in pp collisions at , measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicity for all measured energies. The results are compared to expectations from event generators, such as PYTHIA and HIJING/B, that are used to model the particle production in pp collisions. The energy dependence of , , and , reaching values compatible with unity for , complement the earlier measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of , which are suppressed with increasing rapidity interval Δy. Any significant contribution of an exchange not suppressed at large Δy (reached at LHC energies) is disfavoured.

Note:

35 pages, 21 captioned figures, 11 tables, authors from page 30, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/594

p p: interaction
baryon: hadroproduction
baryon: yield
p
Lambda
Xi-
Omega-
baryon antibaryon: ratio
energy dependence
rapidity dependence

References(67)

Figures(34)

[1]

PYTHIA 6.4 Physics and Manual

Torbjorn Sjostrand
(
- Lund U., Dept. Theor. Phys.
)
,
Stephen Mrenna
(
- Fermilab
)
,
Peter Z. Skands
(
- Fermilab
)

- JHEP 05 (2006) 026
•
e-Print:
- hep-ph/0603175
•
DOI:
- 10.1088/1126-6708/2006/05/026

[1]

Hard diffraction in hadron hadron interactions and in photoproduction

R. Engel
(
- Leipzig U. and
- Siegen U.
)
,
J. Ranft
(
- CERN
)
,
S. Roesler
(
- Siegen U.
)

- Phys.Rev.D 52 (1995) 1459-1468
•
e-Print:
- hep-ph/9502319
•
DOI:
- 10.1103/PhysRevD.52.1459

[2]

A Possible Description of Baryon Dynamics in Dual and Gauge Theories

G.C. Rossi
(
- CERN
)
,
G. Veneziano
(
- CERN
)

- Nucl.Phys.B 123 (1977) 507-545
•
DOI:
- 10.1016/0550-3213(77)90178-X

[3]

An Introduction to Regge Theory and High Energy Physics

P.D.B. Collins
(
- Durham U.
)

- ,
- ,
•
DOI:
- 10.1017/9781009403269

[4]

Dual parton model

A. Capella
(
- Orsay, LPT
)
,
U. Sukhatme
(
- Illinois U., Chicago
)
,
C-I Tan
(
- Brown U.
)
,
J. Tran Thanh Van
(
- Orsay, LPT
)

- Phys.Rept. 236 (1994) 225-329
•
DOI:
- 10.1016/0370-1573(94)90064-7

[4]

Soft interactions of hadrons in QCD

A.B. Kaidalov
(
- Moscow, ITEP
)

- Surveys High Energ.Phys. 13 (1999) 265-330
•
DOI:
- 10.1080/01422419908244082

[5]

String Model with Baryons: Topology, Classical Motion

X. Artru
(
- Orsay, LPT
)

- Nucl.Phys.B 85 (1975) 442-460
•
DOI:
- 10.1016/0550-3213(75)90019-X

[5]

Triality Constraint on Urbaryon Rearrangement Diagram and Urbaryons in Correlated Mode

- Prog.Theor.Phys. 52 (1974) 341
•
DOI:
- 10.1143/PTP.52.341

[5]

Orientable Hadron Structure

- Prog.Theor.Phys. 54 (1975) 280
•
DOI:
- 10.1143/PTP.54.280

[6]

Mechanisms of $\bar{p} p$ Interaction at Low-energies and High-energies

B.Z. Kopeliovich
(
- Dubna, JINR
)

- Sov.J.Nucl.Phys. 45 (1987) 1078,
- Yad.Fiz. 45 (1987) 1742-1749,
- YAD. FIZ. 45 (1987) 1742-1749 AND DUBNA JINR - 86-471 (86,REC.SEP.) 14p

[6]

Baryon asymmetry of the proton sea at low x

- Z.Phys.C 75 (1997) 693-699
•
e-Print:
- hep-ph/9607486
•
DOI:
- 10.1007/s002880050515

[6]

Baryon stopping at HERA: Evidence for gluonic mechanism

- Phys.Lett.B 446 (1999) 321-325
•
e-Print:
- hep-ph/9810530
•
DOI:
- 10.1016/S0370-2693(98)01546-9

[7]

Can gluons trace baryon number?

D. Kharzeev
(
- CERN and
- Bielefeld U.
)

- Phys.Lett.B 378 (1996) 238-246
•
e-Print:
- nucl-th/9602027
•
DOI:
- 10.1016/0370-2693(96)00435-2

[8]

Midrapidity production of secondaries in pp collisions at RHIC and LHC energies in the quark-gluon string model

- Eur.Phys.J.C 54 (2008) 577-581
•
e-Print:
- 0709.3174
•
DOI:
- 10.1140/epjc/s10052-008-0554-1

[8]

Odderon Effects in pp Collisions: Predictions for LHC Energies

e-Print:
- 0906.2659

[8]

Pomeron and Odderon Contributions at LHC Energies

e-Print:
- 1007.3206

[9]

Baryon junction loops in HIJING / B anti-B v2.0 and the baryon /meson anomaly at RHIC

et al.

- Phys.Rev.C 70 (2004) 064906
•
e-Print:
- nucl-th/0407095
•
DOI:
- 10.1103/PhysRevC.70.064906

[9]

Anti-hyperon enhancement through baryon junction loops

Stephen E. Vance
(
- Columbia U. and
- Washington U., Seattle
)
,
Miklos Gyulassy
(
- Columbia U.
)

- Phys.Rev.Lett. 83 (1999) 1735-1738
•
e-Print:
- nucl-th/9901009
•
DOI:
- 10.1103/PhysRevLett.83.1735

[10]

The ALICE experiment at the CERN LHC

ALICE

Collaboration

•

K. Aamodt
(
- Oslo U.
)

et al.

- JINST 3 (2008) S08002
•
DOI:
- 10.1088/1748-0221/3/08/S08002

[11]

Midrapidity antiproton-to-proton ratio in pp collisions at $\sqrt{s} = 0.9$ and $7$ ~TeV measured by the ALICE experiment

ALICE

Collaboration

•

K. Aamodt

et al.

- Phys.Rev.Lett. 105 (2010) 072002
•
e-Print:
- 1006.5432
•
DOI:
- 10.1103/PhysRevLett.105.072002

[12]

Charged-particle multiplicity density at mid-rapidity in central Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV

ALICE

Collaboration

•

K Aamodt
(
- Bergen U.
)

et al.

- Phys.Rev.Lett. 105 (2010) 252301
•
e-Print:
- 1011.3916
•
DOI:
- 10.1103/PhysRevLett.105.252301

[13]

ALICE: Physics performance report, volume I

ALICE

Collaboration

•

F Carminati
(
- CERN
)
(ed.)

et al.

- J.Phys.G 30 (2004) 1517-1763
•
DOI:
- 10.1088/0954-3899/30/11/001

[13]

ALICE Collaboration

Collaboration

•

K. Aamodt

for the collaboration.

[13]

ALICE: Physics Performance Report

ALICE

Collaboration

•

B Alessandro
(
- Turin U. and
- INFN, Turin
)
(ed.)

et al.

- J.Phys.G 32 (2006) 1295-2040
•
DOI:
- 10.1088/0954-3899/32/10/001

[14]

Commissioning and Prospects for Early Physics with ALICE

P.G. Kuijer
(
- NIKHEF, Amsterdam and
- CERN
)

- Nucl.Phys.A 830 (2009) 81C-88C
•
e-Print:
- 0907.5060
•
DOI:
- 10.1016/j.nuclphysa.2009.10.011

1-25 of 67
1
2
3
25 / page