Elliptic Flow and Fixed p_T Suppression in a Final State Interaction Model

A. Capella; E. G. Ferreiro

REVIEW

Elliptic Flow and Fixed p_T Suppression in a Final State Interaction Model

A. Capella, E. G. Ferreiro

High Energy Physics - Phenomenology · Submitted 21 Feb 2006 · 25 references

Pith's verdict: A useful but over-sold consistency check: the model's v2 signal rests entirely on an ad hoc path-length ansatz, and the 'all pT' claim survives only after a high-pT retune.

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arXiv IDhep-ph/0602196 (version 2)

Pith IDTNJ4HFER, Pith's permanent record of this paper and its review

CitationA. Capella, E. G. Ferreiro. "Elliptic Flow and Fixed p_T Suppression in a Final State Interaction Model." arXiv:hep-ph/0602196 (2006). https://pith.science/paper/TNJ4HFER

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Editor's note

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The paper does two things. It extends the authors' final state interaction model to the pion's transverse motion, and it shows that with the same sigma=1.3 mb and the same pT-shift that fit pi0 R_AA, the model produces v2 numbers close to RHIC data in the soft pT region. That is a real cross-observable consistency check, and the combined use of R_AA and v2 to separate the initial suppression R0_AA from the survival probability is a sensible idea.

But the central claim in the abstract—"for all values of pT"—is too strong. The entire v2 signal comes from the Eq. (12) replacement rho -> rho R_theta/. That replacement is asserted, not derived from the gain-loss equations. It is the only angular dependence in the model, so the soft-pT agreement is a test of that ansatz, not an independent confirmation of a weak FSI. That is the main soft spot.

The high-pT story is softer. With the original pT-shift Eq. (10) the model overestimates v2 above 3 GeV. The paper then changes the shift to Eq. (14) at pT >= 2.9 GeV and sets R0_AA = 1 for pT >= 5 GeV. The product R_AA is roughly preserved, but v2 changes substantially. That means the "all pT" agreement is partly the result of a post hoc adjustment, not a prediction. The paper acknowledges the peripheral centrality mismatch and is honest about the ad hoc nature of the angular ansatz, which is to its credit.

The path length itself is computed at the center of the overlap region, not at the production point. The authors estimate the error at below 10%, and that estimate is reasonable given the integration over T_AA. They also note that an azimuthal shift would increase v2, but that is speculative.

On balance: this is a useful counterweight to the early-thermalization interpretation of v2. It is not a parameter-free success, and the mechanism for flow reduces to a single geometric ansatz. But the paper is transparent about its assumptions and gives a concrete, falsifiable way to think about non-hydro v2. A serious referee should engage with it; the main request would be to derive or at least defend the path-length replacement better, and to stop presenting the high-pT agreement as a prediction.

I'd send it to review. It won't reshape the field, but it is a legitimate, clearly argued alternative that belongs in the discussion.

Referee report

Significance

If the claimed agreement held with fixed inputs, the paper would provide a nontrivial challenge to the standard thermalization interpretation of elliptic flow, showing that a moderate final state interaction cross-section of about 1 mb can generate v2 across all pT. The combined analysis of R_AA and v2 to separately constrain the initial suppression R0_AA is a useful idea, and the explicit analytic expressions (Eqs. (2), (12), (13)) make the model easy to test. However, as detailed below, the 'all pT' agreement is achieved only after reparametrizing the pT-shift at high pT, and the v2 signal itself comes from an ad hoc path-length ansatz rather than from the gain-loss dynamics. The low-pT v2 agreement is a genuine consistency check using fitted sigma and shift, but it is not a parameter-free prediction.

Major objections (4)

[Section 5, Eq. (14)] The abstract and Section 4 state that v2 is obtained with the same value of sigma and the same pT-shift used for R_AA. This is not the case for the results that agree with data at high pT: Eq. (14) introduces a new pT-shift, chosen specifically to reduce the large-pT v2 that Eq. (10) overestimates, while setting R0_AA = 1 for pT >= 5 GeV keeps R_AA unchanged. Thus the high-pT agreement is a refit, not a prediction with fixed input. The central claim should be restricted to the region where Eq. (10) applies, or the paper should explicitly characterize Eq. (14) as a constrained determination from v2, not as a consequence of the FSI model.
[Section 4, Eq. (12)] The entire v2 signal originates from the replacement rho -> rho R_theta/<R_theta>. This ansatz is not derived from the gain-loss equations, and without it the survival probability is angle-independent and v2 vanishes. Consequently, the agreement with v2 data tests this path-length hypothesis, not the final state interaction model itself. The paper would be strengthened by a more detailed justification of Eq. (12), or by explicitly labeling it as an ad hoc assumption whose success is suggestive but not a derivation.
[Section 5, Figs. 4 and 5] The centrality dependence of v2 at low pT is not reproduced for peripheral collisions; the authors acknowledge this in the text ('This important point has to be clarified') and restrict their quantitative claim to b <~ 6 fm. Since peripheral collisions are part of the data set, the statement in the abstract that v2 is described 'for all values of pT' should be qualified to also specify the centrality range, and the peripheral discrepancy should be incorporated into the conclusions rather than left as an open caveat.
[Section 3, Eq. (10)] The soft-pT v2 agreement is a consistency check rather than an independent prediction: the cross-section sigma = 1.3 mb and the low-pT shift Eq. (10) are fitted to the R_AA data. This is not a flaw in itself, but the paper should state more prominently that the v2 comparison uses inputs already tuned to R_AA, so it does not provide fully independent evidence for the FSI mechanism at low pT.

Minor objections (4)

[Section 5] The treatment of R0_AA for 2.9 < pT < 5 GeV is not specified; the text says Eq. (8) is used for pT < 2.9 GeV and R0_AA = 1 for pT >= 5 GeV, but the transition region is left undefined. Please clarify how R0_AA is interpolated between these ranges.
[Section 6] In the paragraph beginning 'As a consequence, only rear events are...', 'rear' should be 'rare'.
[Figure captions] Several figure captions contain typographical errors: 'correponds' in Figs. 1, 3, and 6, and 'continous' in Figs. 1, 3, 5, and 6.
[Section 2, Eq. (2)] The notation N_pi0(pT)(b) in Eq. (2) is introduced without a precise definition; it is later defined implicitly through Eq. (9). Please define it explicitly as the (per binary collision) pion yield used in the model.

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The paper

The paper claims

A final-state interaction with a moderate cross-section, already fitted to pion suppression, also produces the measured elliptic flow at all transverse momenta, the paper claims.

The reading

The paper extends a final-state interaction model, previously used for strangeness enhancement, J/psi suppression, and fixed-$p_T$ pion suppression, to include the motion of the pion in the transverse plane. The new ingredient is a survival probability that depends on the pion's azimuthal angle through the path length it traverses in the overlap region of the colliding nuclei. With the same cross-section $\sigma = 1.3$ mb and the same $p_T$-shift used to fit the pion suppression ratio $R_{AA}$, the model yields values of elliptic flow $v_2$ close to the experimental ones at all $p_T$, including the soft region. If the claim is right, elliptic flow at RHIC does not by itself require early thermalization; a moderate final-state interaction affecting only rare, strongly modified events would suffice.

What carries the argument

The machinery is the angular-dependent survival probability $S_{\pi^0}^{\theta_R}(p_T,b)$, obtained from the analytic solution of the gain-loss equations. Its key input is the path length $R_{\theta_R}(b) = R_A\sin(\theta_R - \alpha)/\sin\theta_R$, measured from the center of the overlap region; through the replacement of eq. (12), this length rescales the effective density seen by a pion moving at azimuthal angle $\theta_R$. The elliptic flow is then the $\cos(2\theta_R)$-weighted average of the survival probability (eq. (13)). This mechanism converts an angle-averaged suppression into an azimuthally asymmetric one, and it is the sole source of $v_2$ in the model.

Extended reading notes

Core claim

The central claim is that a single final-state interaction mechanism, with one value of the cross-section and one $p_T$-shift, simultaneously accounts for fixed-$p_T$ pion suppression and elliptic flow. The angular dependence is introduced by replacing the density $\rho(b,y)$ in the survival probability with $\rho(b,y)R_{\theta_R}/\langle R_{\theta_R}\rangle$, where $R_{\theta_R}$ is the pion path length in the overlap region at azimuthal angle $\theta_R$. This makes suppression weakest along the reaction plane and strongest perpendicular to it, producing a positive $v_2$ through the weighted average in eq. (13). When the large-$p_T$ shift is adjusted and the initial suppression is taken close to unity above 5 GeV, $v_2$ saturates at large $p_T$, as observed. The authors conclude that this contribution to $v_2$ is a non-flow effect: it exists even at zero impact parameter and does not require thermalization, while still leaving room for other mechanisms to contribute.

Load-bearing premise

Everything follows from replacing the density in the survival probability by the path-length-weighted density $\rho R_{\theta_R}/\langle R_{\theta_R}\rangle$; if the relevant interaction time or traversed density is not simply proportional to the path length from the center of the overlap, the predicted flow changes.

Editorial extensions

If this is right

Elliptic flow in central and mid-central Au+Au collisions can be explained without early thermalization: a final-state cross-section near 1 mb acting through path-length-dependent suppression reproduces the measured $v_2$.
The same $p_T$-shift that fits $\pi^0$ suppression also fixes $v_2$; using the large-$p_T$ shift of eq. (14) makes $v_2$ saturate above about 3 GeV, matching the observed flattening.
Combining $R_{AA}$ and $v_2$ data separates the initial suppression $R^0_{AA}$ from the final-state survival probability, and both data sets together require $R^0_{AA}$ close to unity for $p_T \gtrsim 5$ GeV.
The model reproduces the azimuthal-angle dependence of $\pi^0$ suppression at high $p_T$ in central and mid-central bins, providing a direct angular check of the mechanism; peripheral collisions remain a point to clarify.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

Because the paper computes only the second harmonic, the same path-length geometry should also generate higher-order harmonics such as $v_4$ with fixed signs and magnitudes; measuring them would extend the test of the ansatz.
The same angular replacement could be applied to other rare probes described by the model, such as $J/\psi$ suppression, predicting an azimuthal modulation of $J/\psi$ yields without new parameters.
A dynamical treatment of transverse expansion, rather than the static path-length rescaling of eq. (12), would show whether the predicted flow survives; high-$p_T$ identified-particle $v_2$ is a sharper discriminant than inclusive data.

Original abstract

It has been shown that a final state interaction model, used to describe J/psi suppression, can also describe the fixed p_T suppression of the pi^0 (and charged pions) yield at all values of p_T, with a final state interaction cross-section sigma close to one milibarn. We propose an extension of the model to the pion motion in the transverse plane - which introduces a dependence of the suppression on the azimuthal angle theta_R. Using the same value of sigma, we obtain values of the elliptic flow v_2 close to the experimental ones, for all values of p_T, including the soft p_T region.

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Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 3,062 input tokens, $0.0001 reported.

What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.10 · human participants 0.01 · controlled comparison 0.07 · randomized assignment 0.01 · states quantitative result 0.95 · compares with prior results 0.66 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; show every role.

It has been shown that a final state interaction model, used to describe J/psi suppression, can also describe the fixed p_T suppression of the pi^0 (and charged pions) yield at all values of p_T, with a final state interaction cross-section sigma close to one milibarn. We propose an extension of the model to the pion motion in the transverse plane - which introduces a dependence of the suppression on the azimuthal angle theta_R. Using the same value of sigma, we obtain values of the elliptic flow v_2 close to the experimental ones, for all values of p_T, including the soft p_T region.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	It has been shown that a final state interaction model, used to describe J/psi suppression, can also describe the fixed p_T suppression of the pi^0 (and charged pions) yield at all values of p_T, with a final state interaction cross-section sigma close to one milibarn.	background 0.63	0.15	0.40	asserted 1.00
s1	We propose an extension of the model to the pion motion in the transverse plane - which introduces a dependence of the suppression on the azimuthal angle theta_R.	contribution 0.87	0.76	0.11	speculative 0.44
s2	Using the same value of sigma, we obtain values of the elliptic flow v_2 close to the experimental ones, for all values of p_T, including the soft p_T region.	result 1.00	0.92	0.50	asserted 0.98

What kind of paper the classifier reports this is: theoretical result 0.92 · evidence from simulation or computation 0.77.

What was examined, and what was not

sources read

arXiv listing abstract v2

not examined

full text
figures and tables
references and citing sentences
relations to other papers

levels run

P abstract

not run

S sections
T body sentences
C citations
R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

Figures

**Figure 1.** The π 0 suppression factor RAuAu(pT , b) at √ s = 200 GeV, eq. (7), versus pT in the centrality bin 0-10 % and the corresponding π 0 initial suppression factor R0 AuAu(pT , b) (i.e. in the absence of final state interaction). The dashed lines correponds to our results obtained using eq. (8) for R0 AuAu and a pT -shift given by eq. (10). The continous lines are obtain with R0 AuAu described in Section 5 and the pT -shift given eq. (10) for pT < 2.9 GeV and eq. (14) for pT ≥ 2.9 GeV. The data are from [20]. 16

**Figure 2.** The π 0 suppression factor RAuAu(pT , b) versus the number of participants, Npart, for pT ≥ 4 GeV. The data are from [20]. 17

**Figure 3.** Values of the elliptic flow v2(b, pT ) versus pT in the centrality bin 13 %- 26 %. The continous line correponds to our results obtained using eq. (14), the dashed line corresponds to our results obtained using eq. (10). The data are from [21]. 18

**Figure 4.** Values of the v2(b, pT ) versus the number of participants for different values of pT : pT = 0.4 GeV (lower line), pT = 0.75 Gev (middle) and pT = 1.35 GeV (top). The black data are from PHENIX [21], the open data are from STAR [23]. 19

**Figure 5.** Values of the v2(b, pT ) versus the number of participants for different values of pT : pT = 0.4 GeV (lower line), pT = 0.75 Gev (middle) and pT = 1.35 GeV (top) compared to: data in minimum bias collisions from PHENIX [22] (black symbols) and STAR [23] (opened symbols) –above–, data from PHENIX [22] –below–. 20

**Figure 6.** Values of the π 0 suppression RAuAu(b, θR) as a function of the azimuthal angle θR (measured from the impact parameter direction) for pT ≥ 4 GeV in various centrality bins. The continous line correponds to our results obtained using eq. (14), the dashed line corresponds to our results obtained using eq. (10). The preliminary data are from [24]. 21

Figures reproduced from arXiv:hep-ph/0602196 by the authors.

References

Works cited (25)

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A. Tounsi, K. Redlich, hep-ph/0111159. J. S. Hamich, K. Redlich, A. Tounsi, Phys. Lett. B486, 61 (2000) and J. Phys. G 27, 413 (2001)

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D. Kharzeev, M. Nardi, H. Satz, Phys. Lett. B405, 14 (1997). N. Armesto, A. Capella, E. G. Ferreiro, Phys. Rev. C59, 395 (1999). A. K. Chaudhuri, nucl-th/0212046

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R. S. Bhalerao, J. P. Blaizot, N. Borghini and J. Y. Ollitrault, Phys . Lett. B627, 49 (2005)

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D. Molnar, S. A. Voloshin, Phys. Rev. Lett. 91, 092301 (2003). V. Greco, C. M. Ko, P. Levai, Phys. Rev. Lett. 90, 202302 (2003). R. J. Fries, B. M¨ uller, C. Nonaka, S. A. Bass, Phys. Rev. Lett. 90, 202303 (2003). R. C. Hwa, C. B. Yang, Phys. Rev. C70, 024904 (2004). D. Molnar, nucl-th/0408044. S. Pratt, S. Pal, Nucl. Phys. A749, 268 (2005); Phys. Rev. C7...

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M. Bleicher, H. St¨ ocker, Phys. Lett. B526, 309 (2002). Z. W. Lin, C. M. Ko, B. A. Li, B. Zhang, S. Pal, Phys. Rev. C72, 064901 (2005). B. Zhang, M. Gyulassy, C. M. Ko, Phys. Lett. B455, 45 (1999)

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A. Capella, C. A. Salgado, D. Sousa, Eur. Phys. J C30, 111 (2003). 14

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A. Capella, D. Sousa, Eur. Phys. J. C30, 117 (2003). A. Capella, E. G. Ferreiro, A. Kaidalov, Phys. Rev. Lett. 85, 2080 (2000)

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STAR Collaboration, C. Adler et al., Phys. Rev. Lett. 87, 262302 (2001) ; J. Castillo, Nucl. Phys. A715, 518c (2003)

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NA50 Collaboration, L. Ramello, Nucl. Phys. A715, 243c (2003) ; L. Kluberg in Proc. Quark Matter 2004, Oklahoma, USA

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A. Capella, E. G. Ferreiro, A. Kaidalov, D. Sousa, Eur. Phys. J C40, 129 (2005)

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A. Drees, H. Feng, J. Jia, Phys. Rev. C71, 034909 (2005)

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A. Dainese, C. Loizides, G. Pai´ e, Eur. Phys. J C38, 461 (2005)

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A. Capella, E. G. Ferreiro, Eur. Phys. J C42, 419 (2005)

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C. W. Jager, H. De Vries, C. De Vries, Atomic Data and Nuclear Ta bles 14, 485 (1974)

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[19]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. C69, 034910 (2004)

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[20]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. Lett. 91, 072301 (2003)

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[21]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. Lett. 94, 232302 (2005)

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[22]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. Lett. 91, 182301 (2003)

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[23]

STAR Collaboration, J. Adams et al., Phys. Rev. C72, 014904 (2005)

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[24]

PHENIX Collaboration, D. d’Enterria, Journ´ ee Th´ ematique onJet quenching IPN-Orsay, November 14th, 2005; Eur. Phys. J C43, 295 (2005)

View on Pith 2005
[25]

A. Capella and E. G. Ferreiro, Proceedings of XLIst Rencontre s de Moriond: QCD and High Energy Hadronic Interactions, hep-ph/0604184. 15 Figure 1: The π0 suppression factor RAuAu(pT,b ) at √ s = 200 GeV, eq. (7), versus pT in the centrality bin 0-10 % and the corresponding π0 initial suppression fac- tor R0 AuAu(pT,b ) (i.e. in the absence of ﬁnal state ...

View on Pith Pith review arXiv

How the literature uses it

1 arXiv paper cite this in 2 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 1 paper

We obtain values of the elliptic flow $v_{2}$ close to the experimental ones for all values of $p_T$.

Elliptic Flow in a Final State Interaction Model · 0.91

Papers citing it · 1 sentence without a confident label

Uses its data or values 1 paper

We use $σ= 1.4$ mb at both energies and $δp_ = p_^1.5/20$ for $p_ < 2.9$ GeV and $δp_ = p_^0.8/9.5$ for $p_ > 2.9$ GeV [ref] .

pi0 Fixed pT suppression and elliptic flow at LHC · $π^0$ Fixed $p_$ suppression · 0.89

Discussion

Disagree with the review, or know something it missed? Leave a comment, highlight any passage above to comment on it, or challenge this review formally.

[1] [1]

DPM : A. Capella, U. Sukhatme, C.-I. Tan, J. Tran Thanh Van, Phy s. Lett. B81, 68 (1979) ; Phys. Rep. 236, 225 (1994). QGSM : A. Kaidalov, K. A. Ter-Martirosyan, Yad. Fiz. 39, 1545 (1984) ; Yad Fiz. 41, 1278 (1985)

View on Pith 1979

[2] [2]

A. Tounsi, K. Redlich, hep-ph/0111159. J. S. Hamich, K. Redlich, A. Tounsi, Phys. Lett. B486, 61 (2000) and J. Phys. G 27, 413 (2001)

View on Pith Pith review arXiv 2000

[3] [3]

D. Kharzeev, M. Nardi, H. Satz, Phys. Lett. B405, 14 (1997). N. Armesto, A. Capella, E. G. Ferreiro, Phys. Rev. C59, 395 (1999). A. K. Chaudhuri, nucl-th/0212046

View on Pith Pith review arXiv 1997

[4] [4]

R. S. Bhalerao, J. P. Blaizot, N. Borghini and J. Y. Ollitrault, Phys . Lett. B627, 49 (2005)

View on Pith 2005

[5] [5]

STAR Collaboration, J. Adams et al., nucl-ex/0409033

View on Pith Pith review arXiv

[6] [6]

P. F. Kolb, U. Heinz, nucl-th/0305084

View on Pith Pith review arXiv

[7] [7]

D. Molnar, S. A. Voloshin, Phys. Rev. Lett. 91, 092301 (2003). V. Greco, C. M. Ko, P. Levai, Phys. Rev. Lett. 90, 202302 (2003). R. J. Fries, B. M¨ uller, C. Nonaka, S. A. Bass, Phys. Rev. Lett. 90, 202303 (2003). R. C. Hwa, C. B. Yang, Phys. Rev. C70, 024904 (2004). D. Molnar, nucl-th/0408044. S. Pratt, S. Pal, Nucl. Phys. A749, 268 (2005); Phys. Rev. C7...

View on Pith Pith review arXiv 2003

[8] [8]

M. Bleicher, H. St¨ ocker, Phys. Lett. B526, 309 (2002). Z. W. Lin, C. M. Ko, B. A. Li, B. Zhang, S. Pal, Phys. Rev. C72, 064901 (2005). B. Zhang, M. Gyulassy, C. M. Ko, Phys. Lett. B455, 45 (1999)

View on Pith 2002

[9] [9]

A. Capella, C. A. Salgado, D. Sousa, Eur. Phys. J C30, 111 (2003). 14

View on Pith 2003

[10] [10]

A. Capella, D. Sousa, Eur. Phys. J. C30, 117 (2003). A. Capella, E. G. Ferreiro, A. Kaidalov, Phys. Rev. Lett. 85, 2080 (2000)

View on Pith 2003

[11] [11]

STAR Collaboration, C. Adler et al., Phys. Rev. Lett. 87, 262302 (2001) ; J. Castillo, Nucl. Phys. A715, 518c (2003)

View on Pith 2001

[12] [12]

NA50 Collaboration, L. Ramello, Nucl. Phys. A715, 243c (2003) ; L. Kluberg in Proc. Quark Matter 2004, Oklahoma, USA

View on Pith 2003

[13] [13]

A. Capella, E. G. Ferreiro, A. Kaidalov, D. Sousa, Eur. Phys. J C40, 129 (2005)

View on Pith 2005

[14] [14]

A. Drees, H. Feng, J. Jia, Phys. Rev. C71, 034909 (2005)

View on Pith 2005

[15] [15]

A. Dainese, C. Loizides, G. Pai´ e, Eur. Phys. J C38, 461 (2005)

View on Pith 2005

[16] [16]

B. Koch, U. Heinz, J. Pitsut, Phys. Lett. B243, 149 (1990)

View on Pith 1990

[17] [17]

A. Capella, E. G. Ferreiro, Eur. Phys. J C42, 419 (2005)

View on Pith 2005

[18] [18]

C. W. Jager, H. De Vries, C. De Vries, Atomic Data and Nuclear Ta bles 14, 485 (1974)

View on Pith 1974

[19] [19]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. C69, 034910 (2004)

View on Pith 2004

[20] [20]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. Lett. 91, 072301 (2003)

View on Pith 2003

[21] [21]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. Lett. 94, 232302 (2005)

View on Pith 2005

[22] [22]

PHENIX Collaboration, S. S. Adler et al., Phys. Rev. Lett. 91, 182301 (2003)

View on Pith 2003

[23] [23]

STAR Collaboration, J. Adams et al., Phys. Rev. C72, 014904 (2005)

View on Pith 2005

[24] [24]

PHENIX Collaboration, D. d’Enterria, Journ´ ee Th´ ematique onJet quenching IPN-Orsay, November 14th, 2005; Eur. Phys. J C43, 295 (2005)

View on Pith 2005

[25] [25]

A. Capella and E. G. Ferreiro, Proceedings of XLIst Rencontre s de Moriond: QCD and High Energy Hadronic Interactions, hep-ph/0604184. 15 Figure 1: The π0 suppression factor RAuAu(pT,b ) at √ s = 200 GeV, eq. (7), versus pT in the centrality bin 0-10 % and the corresponding π0 initial suppression fac- tor R0 AuAu(pT,b ) (i.e. in the absence of ﬁnal state ...

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