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Common femtoscopic hadron-emission source in pp collisions at the LHC.

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Title: Common femtoscopic hadron-emission source in pp collisions at the LHC.
Authors: ALICE Collaboration (AUTHOR), Acharya, S.1 (AUTHOR), Adamová, D.2 (AUTHOR), Aglieri Rinella, G.3 (AUTHOR), Agnello, M.4 (AUTHOR), Agrawal, N.5 (AUTHOR), Ahammed, Z.6 (AUTHOR), Ahmad, S.7 (AUTHOR), Ahn, S. U.8 (AUTHOR), Ahuja, I.9 (AUTHOR), Akindinov, A.10 (AUTHOR), Al-Turany, M.11 (AUTHOR), Aleksandrov, D.10 (AUTHOR), Alessandro, B.12 (AUTHOR), Alfanda, H. M.13 (AUTHOR), Alfaro Molina, R.14 (AUTHOR), Ali, B.7 (AUTHOR), Alici, A.15 (AUTHOR), Alizadehvandchali, N.16 (AUTHOR), Alkin, A.3 (AUTHOR)
Source: European Physical Journal C -- Particles & Fields. Feb2025, Vol. 85 Issue 2, p1-23. 23p.
Subjects: Hadron interactions, Charm particles, Strange particles, Hadrons, Pions
Abstract: The femtoscopic study of pairs of identical pions is particularly suited to investigate the effective source function of particle emission, due to the resulting Bose–Einstein correlation signal. In small collision systems at the LHC, pp in particular, the majority of the pions are produced in resonance decays, which significantly affect the profile and size of the source. In this work, we explicitly model this effect in order to extract the primordial source in pp collisions at s = 13 TeV from charged π – π correlations measured by ALICE. We demonstrate that the assumption of a Gaussian primordial source is compatible with the data and that the effective source, resulting from modifications due to resonances, is approximately exponential, as found in previous measurements at the LHC. The universality of hadron emission in pp collisions is further investigated by applying the same methodology to characterize the primordial source of K – p pairs. The size of the primordial source is evaluated as a function of the transverse mass ( m T ) of the pairs, leading to the observation of a common scaling for both π – π and K – p , suggesting a collective effect. Further, the present results are compatible with the m T scaling of the p – p and p - Λ primordial source measured by ALICE in high multiplicity pp collisions, providing additional evidence for the presence of a common emission source for all hadrons in small collision systems at the LHC. This will allow the determination of the source function for any hadron–hadron pairs with high precision, granting access to the properties of the possible final-state interaction among pairs of less abundantly produced hadrons, such as strange or charmed particles. [ABSTRACT FROM AUTHOR]
Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Common femtoscopic hadron-emission source in pp collisions at the LHC.
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  Data: <searchLink fieldCode="AR" term="%22ALICE+Collaboration%22">ALICE Collaboration</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Acharya%2C+S%2E%22">Acharya, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Adamová%2C+D%2E%22">Adamová, D.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aglieri+Rinella%2C+G%2E%22">Aglieri Rinella, G.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Agnello%2C+M%2E%22">Agnello, M.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Agrawal%2C+N%2E%22">Agrawal, N.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahammed%2C+Z%2E%22">Ahammed, Z.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahmad%2C+S%2E%22">Ahmad, S.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahn%2C+S%2E+U%2E%22">Ahn, S. U.</searchLink><relatesTo>8</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ahuja%2C+I%2E%22">Ahuja, I.</searchLink><relatesTo>9</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Akindinov%2C+A%2E%22">Akindinov, A.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Al-Turany%2C+M%2E%22">Al-Turany, M.</searchLink><relatesTo>11</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Aleksandrov%2C+D%2E%22">Aleksandrov, D.</searchLink><relatesTo>10</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alessandro%2C+B%2E%22">Alessandro, B.</searchLink><relatesTo>12</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alfanda%2C+H%2E+M%2E%22">Alfanda, H. M.</searchLink><relatesTo>13</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alfaro+Molina%2C+R%2E%22">Alfaro Molina, R.</searchLink><relatesTo>14</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ali%2C+B%2E%22">Ali, B.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alici%2C+A%2E%22">Alici, A.</searchLink><relatesTo>15</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alizadehvandchali%2C+N%2E%22">Alizadehvandchali, N.</searchLink><relatesTo>16</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Alkin%2C+A%2E%22">Alkin, A.</searchLink><relatesTo>3</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22European+Physical+Journal+C+--+Particles+%26+Fields%22">European Physical Journal C -- Particles & Fields</searchLink>. Feb2025, Vol. 85 Issue 2, p1-23. 23p.
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  Data: <searchLink fieldCode="DE" term="%22Hadron+interactions%22">Hadron interactions</searchLink><br /><searchLink fieldCode="DE" term="%22Charm+particles%22">Charm particles</searchLink><br /><searchLink fieldCode="DE" term="%22Strange+particles%22">Strange particles</searchLink><br /><searchLink fieldCode="DE" term="%22Hadrons%22">Hadrons</searchLink><br /><searchLink fieldCode="DE" term="%22Pions%22">Pions</searchLink>
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  Label: Abstract
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  Data: The femtoscopic study of pairs of identical pions is particularly suited to investigate the effective source function of particle emission, due to the resulting Bose–Einstein correlation signal. In small collision systems at the LHC, pp in particular, the majority of the pions are produced in resonance decays, which significantly affect the profile and size of the source. In this work, we explicitly model this effect in order to extract the primordial source in pp collisions at s = 13 TeV from charged π – π correlations measured by ALICE. We demonstrate that the assumption of a Gaussian primordial source is compatible with the data and that the effective source, resulting from modifications due to resonances, is approximately exponential, as found in previous measurements at the LHC. The universality of hadron emission in pp collisions is further investigated by applying the same methodology to characterize the primordial source of K – p pairs. The size of the primordial source is evaluated as a function of the transverse mass ( m T ) of the pairs, leading to the observation of a common scaling for both π – π and K – p , suggesting a collective effect. Further, the present results are compatible with the m T scaling of the p – p and p - Λ primordial source measured by ALICE in high multiplicity pp collisions, providing additional evidence for the presence of a common emission source for all hadrons in small collision systems at the LHC. This will allow the determination of the source function for any hadron–hadron pairs with high precision, granting access to the properties of the possible final-state interaction among pairs of less abundantly produced hadrons, such as strange or charmed particles. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of European Physical Journal C -- Particles & Fields is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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