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1. Publisher Correction: The asymmetry of antimatter in the proton.

Author

Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, Ye, Z, Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, and Ye, Z

Abstract

In Fig. 1c of this Article, the x-axis scale was inadvertently duplicated from Fig. 1b. The original Article has been corrected online.

Published
2022

2. Publisher Correction: The asymmetry of antimatter in the proton.

Author

Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, Ye, Z, Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, and Ye, Z

Abstract

In Fig. 1c of this Article, the x-axis scale was inadvertently duplicated from Fig. 1b. The original Article has been corrected online.

Published
2022

3. The asymmetry of antimatter in the proton.

Author

Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, Ye, Z, Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, and Ye, Z

Abstract

The fundamental building blocks of the proton-quarks and gluons-have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as its spin1. The two up quarks and the single down quark that comprise the proton in the simplest picture account only for a few per cent of the proton mass, the bulk of which is in the form of quark kinetic and potential energy and gluon energy from the strong force2. An essential feature of this force, as described by quantum chromodynamics, is its ability to create matter-antimatter quark pairs inside the proton that exist only for a very short time. Their fleeting existence makes the antimatter quarks within protons difficult to study, but their existence is discernible in reactions in which a matter-antimatter quark pair annihilates. In this picture of quark-antiquark creation by the strong force, the probability distributions as a function of momentum for the presence of up and down antimatter quarks should be nearly identical, given that their masses are very similar and small compared to the mass of the proton3. Here we provide evidence from muon pair production measurements that these distributions are considerably different, with more abundant down antimatter quarks than up antimatter quarks over a wide range of momenta. These results are expected to revive interest in several proposed mechanisms for the origin of this antimatter asymmetry in the proton that had been disfavoured by previous results4, and point to future measurements that can distinguish between these mechanisms.

Published
2021

4. The asymmetry of antimatter in the proton.

Author

Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, Ye, Z, Dove, J, Dove, J, Kerns, B, McClellan, RE, Miyasaka, S, Morton, DH, Nagai, K, Prasad, S, Sanftl, F, Scott, MBC, Tadepalli, AS, Aidala, CA, Arrington, J, Ayuso, C, Barker, CL, Brown, CN, Chang, WC, Chen, A, Christian, DC, Dannowitz, BP, Daugherity, M, Diefenthaler, M, El Fassi, L, Geesaman, DF, Gilman, R, Goto, Y, Guo, L, Guo, R, Hague, TJ, Holt, RJ, Isenhower, D, Kinney, ER, Kitts, N, Klein, A, Kleinjan, DW, Kudo, Y, Leung, C, Lin, P-J, Liu, K, Liu, MX, Lorenzon, W, Makins, NCR, de Medeiros, M Mesquita, McGaughey, PL, Miyachi, Y, Mooney, I, Nakahara, K, Nakano, K, Nara, S, Peng, J-C, Puckett, AJ, Ramson, BJ, Reimer, PE, Rubin, JG, Sawada, S, Sawada, T, Shibata, T-A, Su, D, Teo, M, Tice, BG, Towell, RS, Uemura, S, Watson, S, Wang, SG, Wickes, AB, Wu, J, Xi, Z, and Ye, Z

Abstract

The fundamental building blocks of the proton-quarks and gluons-have been known for decades. However, we still have an incomplete theoretical and experimental understanding of how these particles and their dynamics give rise to the quantum bound state of the proton and its physical properties, such as its spin1. The two up quarks and the single down quark that comprise the proton in the simplest picture account only for a few per cent of the proton mass, the bulk of which is in the form of quark kinetic and potential energy and gluon energy from the strong force2. An essential feature of this force, as described by quantum chromodynamics, is its ability to create matter-antimatter quark pairs inside the proton that exist only for a very short time. Their fleeting existence makes the antimatter quarks within protons difficult to study, but their existence is discernible in reactions in which a matter-antimatter quark pair annihilates. In this picture of quark-antiquark creation by the strong force, the probability distributions as a function of momentum for the presence of up and down antimatter quarks should be nearly identical, given that their masses are very similar and small compared to the mass of the proton3. Here we provide evidence from muon pair production measurements that these distributions are considerably different, with more abundant down antimatter quarks than up antimatter quarks over a wide range of momenta. These results are expected to revive interest in several proposed mechanisms for the origin of this antimatter asymmetry in the proton that had been disfavoured by previous results4, and point to future measurements that can distinguish between these mechanisms.

Published
2021

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